Merge remote-tracking branch 'origin/main' into fix/ui

# Conflicts:
#	apps/app-frontend/src/locales/en-US/index.json
#	apps/app-frontend/src/locales/zh-CN/index.json

.github/workflows/changelog-comment.yml

@@ -12,7 +12,7 @@ on:
 
 permissions:
   issues: write
-  pull-requests: read
+  pull-requests: write
 
 jobs:
   comment:
@@ -21,7 +21,7 @@ jobs:
 
     permissions:
       issues: write
-      pull-requests: read
+      pull-requests: write
       contents: read
 
     steps:

apps/app-frontend/src/App.vue

@@ -95,6 +95,7 @@ import NavRail from '@/components/ui/NavRail.vue'
 import OnboardingOverlay from '@/components/ui/onboarding/OnboardingOverlay.vue'
 import QuickInstanceSwitcher from '@/components/ui/QuickInstanceSwitcher.vue'
 import SkinSiteSessionFrame from '@/components/ui/SkinSiteSessionFrame.vue'
+import RemoteAnnouncements from '@/components/ui/RemoteAnnouncements.vue'
 import StartupAnnouncementModal from '@/components/ui/StartupAnnouncementModal.vue'
 import SplashScreen from '@/components/ui/SplashScreen.vue'
 import WindowControls from '@/components/ui/WindowControls.vue'
@@ -2227,6 +2228,7 @@ provideAppUpdateDownloadProgress(appUpdateDownload)
 	<SkinSiteSessionFrame v-if="stateInitialized" />
 	<InstancePlayerModal v-if="stateInitialized" />
 	<StartupAnnouncementModal ref="startupAnnouncementModal" />
+	<RemoteAnnouncements :ready="stateInitialized && !showOnboarding && !stateFailed" />
 	<div id="teleports"></div>
 	<div
 		v-if="stateInitialized && themeStore.customBackgroundPath && !themeStore.transparentBackground"

apps/app-frontend/src/announcements/catalog.ts

@@ -32,6 +32,33 @@ export const ANNOUNCEMENT_CHANGE_TYPES: readonly AnnouncementChangeType[] = [
 ]
 
 export const launcherAnnouncements: readonly LauncherAnnouncement[] = [
+	{
+		id: 'launcher-1.0.2-beta5',
+		version: '1.0.2-beta5',
+		publishedAt: '2026-10-11',
+		title: {
+			'en-US': 'Starlight Launcher 1.0.2-beta5',
+			'zh-CN': 'Starlight Launcher 1.0.2-beta5',
+		},
+		changes: {
+			added: [
+				{
+					'en-US': 'Added a remote announcements center: a bell in the top bar opens a panel listing launcher announcements fetched from the Starlight skin site.',
+					'zh-CN': '新增远程公告中心：顶栏的铃铛可打开公告面板，展示从 Starlight 皮肤站拉取的启动器公告。',
+				},
+				{
+					'en-US': 'Added a custom Minecraft window title option: set a global toggle and default title, and let each instance override it. The game window is renamed on Windows.',
+					'zh-CN': '新增自定义 Minecraft 窗口标题：可设置全局开关与默认标题，并允许各实例单独覆盖；Windows 下会重命名游戏窗口。',
+				},
+			],
+			fixed: [
+				{
+					'en-US': 'Completed the Chinese translations for the armor preview feature.',
+					'zh-CN': '补齐盔甲预览功能的中文翻译。',
+				},
+			],
+		},
+	},
 	{
 		id: 'launcher-1.0.2-beta4',
 		version: '1.0.2-beta4',
@@ -41,6 +68,16 @@ export const launcherAnnouncements: readonly LauncherAnnouncement[] = [
 			'zh-CN': 'Starlight Launcher 1.0.2-beta4',
 		},
 		changes: {
+			added: [
+				{
+					'en-US': 'Added armor and armor-trim rendering to the skin preview, letting you try on armor pieces and trim patterns directly in the skin editor.',
+					'zh-CN': '皮肤预览新增盔甲与盔甲纹饰渲染，可在皮肤编辑器内直接试穿各部位盔甲并调整纹饰图案。',
+				},
+				{
+					'en-US': 'Armor preview selections in the skin editor are now saved locally, so they persist across sessions.',
+					'zh-CN': '皮肤编辑器中的盔甲预览选择现在会保存在本地，跨会话保留。',
+				},
+			],
 			changed: [
 				{
 					'en-US': 'Improved download scheduling to reduce concurrency automatically when tasks are waiting for capacity, making large Minecraft installations more reliable on constrained connections.',

apps/app-frontend/src/components/ui/AppActionBar.vue

@@ -67,6 +67,23 @@
 				</div>
 			</template>
 		</Dropdown>
+		<ButtonStyled
+			v-tooltip="formatMessage(messages.announcements)"
+			type="transparent"
+			circular
+		>
+			<button
+				:aria-label="formatMessage(messages.announcements)"
+				class="relative"
+				@click="openAnnouncementCenter"
+			>
+				<NewspaperIcon />
+				<span
+					v-if="announcementUnreadCount"
+					class="absolute right-0 top-0 size-2 rounded-full bg-red ring-2 ring-bg-raised"
+				/>
+			</button>
+		</ButtonStyled>
 		<ButtonStyled
 			v-if="!isDownloadsPage && hasActiveDownloads && !hasVisibleActiveDownloadToasts"
 			color="brand"
@@ -190,6 +207,7 @@
 <script setup lang="ts">
 import {
 	BellIcon,
+	NewspaperIcon,
 	DownloadIcon,
 	DropdownIcon,
 	OnlineIndicatorIcon,
@@ -211,7 +229,7 @@ import {
 } from '@modrinth/ui'
 import { convertFileSrc } from '@tauri-apps/api/core'
 import { Dropdown } from 'floating-vue'
-import { computed, onBeforeUnmount, ref, watch } from 'vue'
+import { computed, onBeforeUnmount, onMounted, ref, watch } from 'vue'
 import { useRoute, useRouter } from 'vue-router'
 
 import AppUpdateButton from '@/components/ui/app-update-button/index.vue'
@@ -222,6 +240,10 @@ import { get_many as getInstances } from '@/helpers/instance'
 import { get_all as getRunningProcesses, kill as killProcess } from '@/helpers/process'
 import type { LoadingBar } from '@/helpers/state'
 import { progress_bars_list } from '@/helpers/state'
+import {
+	OPEN_REMOTE_ANNOUNCEMENT_CENTER_EVENT,
+	REMOTE_ANNOUNCEMENTS_UPDATED_EVENT,
+} from '@/helpers/remote-announcements'
 import type { GameInstance } from '@/helpers/types'
 import { downloadBarTypes, injectDownloadManager } from '@/providers/download-manager'
 
@@ -231,6 +253,25 @@ const popupNotificationManager = injectPopupNotificationManager()
 const downloadManager = injectDownloadManager()
 const { formatMessage } = useVIntl()
 
+const announcementUnreadCount = ref(0)
+
+function openAnnouncementCenter() {
+	window.dispatchEvent(new CustomEvent(OPEN_REMOTE_ANNOUNCEMENT_CENTER_EVENT))
+}
+
+function updateAnnouncementCount(event: Event) {
+	const detail = (event as CustomEvent<{ unreadKeys?: string[] }>).detail
+	announcementUnreadCount.value = detail?.unreadKeys?.length ?? 0
+}
+
+onMounted(() => {
+	window.addEventListener(REMOTE_ANNOUNCEMENTS_UPDATED_EVENT, updateAnnouncementCount)
+})
+
+onBeforeUnmount(() => {
+	window.removeEventListener(REMOTE_ANNOUNCEMENTS_UPDATED_EVENT, updateAnnouncementCount)
+})
+
 type NotificationHistoryItem = {
 	key: string
 	createdAt?: number
@@ -370,6 +411,10 @@ const messages = defineMessages({
 		id: 'app.action-bar.notifications',
 		defaultMessage: 'Notifications',
 	},
+	announcements: {
+		id: 'app.action-bar.announcements',
+		defaultMessage: 'Announcements',
+	},
 	clearNotifications: {
 		id: 'app.action-bar.notifications.clear',
 		defaultMessage: 'Clear all',

apps/app-frontend/src/components/ui/RemoteAnnouncements.vue

@@ -0,0 +1,425 @@
+<script setup lang="ts">
+import {
+	Button,
+	commonMessages,
+	defineMessages,
+	NewModal,
+	useModalStack,
+	useVIntl,
+} from '@modrinth/ui'
+import { renderString } from '@modrinth/utils'
+import { fetch as tauriFetch } from '@tauri-apps/plugin-http'
+import { openUrl } from '@tauri-apps/plugin-opener'
+import { computed, nextTick, onMounted, onUnmounted, reactive, ref, watch } from 'vue'
+
+import {
+	announcementKey,
+	isAnnouncementActive,
+	mapBroadcastAnnouncements,
+	OPEN_REMOTE_ANNOUNCEMENT_CENTER_EVENT,
+	parseAnnouncements,
+	REMOTE_ANNOUNCEMENTS_UPDATED_EVENT,
+	type RemoteAnnouncement,
+	safeAnnouncementUrl,
+} from '@/helpers/remote-announcements'
+
+import {
+	requestSkinSiteDownloadToken,
+	skinSiteStatus,
+	waitForSkinSiteSession,
+} from '@/composables/skin-site-session.ts'
+
+const props = defineProps<{ ready: boolean; previewOnly?: boolean }>()
+const { formatMessage } = useVIntl()
+const { hasModal } = useModalStack()
+const messages = defineMessages({
+	view: { id: 'app.remote-announcements.view', defaultMessage: 'View announcement' },
+	unread: { id: 'app.remote-announcements.unread', defaultMessage: 'Unread' },
+	readAll: {
+		id: 'app.remote-announcements.read-all',
+		defaultMessage: 'Mark all announcements as read',
+	},
+	centerTitle: { id: 'app.remote-announcements.center-title', defaultMessage: 'Announcements' },
+	empty: { id: 'app.remote-announcements.empty', defaultMessage: 'No announcements' },
+	previewTitle: {
+		id: 'app.remote-announcements.preview-title',
+		defaultMessage: 'Announcement style preview',
+	},
+	previewSummary: {
+		id: 'app.remote-announcements.preview-summary',
+		defaultMessage:
+			'This is a local preview. Select View announcement to preview the full Markdown content.',
+	},
+	previewContent: {
+		id: 'app.remote-announcements.preview-content',
+		defaultMessage:
+			'## Announcement preview\n\nThis is **sample content**, not a published announcement.\n\n- Supports headings, lists, and links\n- Close buttons are always available\n\n> Previewing does not change real announcement read status.\n\n| Type | Display |\n| --- | --- |\n| Modal | Full Markdown content |\n| Popup | Summary, then full content |\n\n[Visit the website](https://skin.starlight.cool/)',
+	},
+	previewAction: { id: 'app.remote-announcements.preview-action', defaultMessage: 'Visit website' },
+})
+const modal = ref<InstanceType<typeof NewModal>>()
+const selected = ref<RemoteAnnouncement | null>(null)
+const active = ref(false)
+const centerOpen = ref(false)
+const startupNotice = ref<RemoteAnnouncement | null>(null)
+const html = computed(() => renderString(selected.value?.content ?? ''))
+const stateKey = 'starlight-remote-announcements-v2'
+const read = reactive(new Set<string>())
+const queuedThisSession = new Set<string>()
+const startupNotified = new Set<string>()
+let items: RemoteAnnouncement[] = []
+let pending: RemoteAnnouncement[] = []
+let cacheKey = 'starlight-remote-announcements-cache-v1'
+let cacheLoaded = false
+let disposed = false
+let interval: ReturnType<typeof setInterval> | undefined
+let advanceTimer: ReturnType<typeof setTimeout> | undefined
+
+function persist() {
+	if (props.previewOnly) return
+	try {
+		localStorage.setItem(
+			stateKey,
+			JSON.stringify({
+				read: [...read].slice(-1000),
+			}),
+		)
+	} catch {
+		// localStorage may be unavailable (private mode / quota)
+	}
+}
+function emitState() {
+	window.dispatchEvent(
+		new CustomEvent(REMOTE_ANNOUNCEMENTS_UPDATED_EVENT, {
+			detail: {
+				items,
+				unreadKeys: items.filter((item) => !read.has(announcementKey(item))).map(announcementKey),
+			},
+		}),
+	)
+}
+function openCenter(item?: RemoteAnnouncement) {
+	if (!props.ready || disposed) return
+	void refresh()
+	centerOpen.value = true
+	if (item) {
+		startupNotice.value = null
+		selectAnnouncement(item)
+	} else if (!selected.value && items.length) {
+		selectAnnouncement(items[0])
+	}
+	void nextTick(() => modal.value?.show())
+}
+function handleOpenCenter() {
+	if (props.previewOnly) return
+	openCenter()
+}
+async function show(item: RemoteAnnouncement) {
+	if (
+		disposed ||
+		!props.ready ||
+		!isAnnouncementActive(item) ||
+		(hasModal.value && !active.value && !centerOpen.value)
+	)
+		return
+	centerOpen.value = true
+	active.value = true
+	selectAnnouncement(item)
+	await nextTick()
+	if (!disposed) modal.value?.show()
+}
+function selectAnnouncement(item: RemoteAnnouncement) {
+	selected.value = item
+	const key = announcementKey(item)
+	read.add(key)
+	pending = pending.filter((entry) => announcementKey(entry) !== key)
+	persist()
+	emitState()
+}
+function markAllRead() {
+	for (const item of items) {
+		read.add(announcementKey(item))
+	}
+	pending = []
+	persist()
+	emitState()
+}
+function advance() {
+	if (disposed || !props.ready || hasModal.value || active.value) return
+	const next = pending.shift()
+	if (next) {
+		void show(next)
+		return
+	}
+	for (const item of items) {
+		const key = announcementKey(item)
+		if (
+			item.type === 'notification' &&
+			!startupNotified.has(key) &&
+			!read.has(key) &&
+			isAnnouncementActive(item)
+		) {
+			startupNotice.value = item
+			startupNotified.add(key)
+			setTimeout(() => {
+				if (startupNotice.value === item) {
+					startupNotice.value = null
+					advance()
+				}
+			}, 8000)
+			break
+		}
+	}
+}
+function closed() {
+	active.value = false
+	centerOpen.value = false
+	if (advanceTimer) clearTimeout(advanceTimer)
+	advanceTimer = setTimeout(advance, 350)
+}
+function sync(next: RemoteAnnouncement[], fresh: boolean) {
+	items = next.filter((item) => isAnnouncementActive(item))
+	const keys = new Set(items.map(announcementKey))
+	pending = pending.filter((item) => keys.has(announcementKey(item)))
+	if (selected.value && !keys.has(announcementKey(selected.value))) selected.value = null
+	emitState()
+	if (fresh) {
+		for (const item of items) {
+			const key = announcementKey(item)
+			if (
+				item.type === 'modal' &&
+				!queuedThisSession.has(key) &&
+				(!read.has(key) || item.priority === 'critical')
+			) {
+				queuedThisSession.add(key)
+				pending.push(item)
+			}
+		}
+		advance()
+	}
+}
+function loadCache() {
+	if (cacheLoaded || !cacheKey) return
+	cacheLoaded = true
+	try {
+		const cached = JSON.parse(localStorage.getItem(cacheKey) ?? 'null')
+		if (cached && typeof cached.savedAt === 'number' && Date.now() - cached.savedAt < 86400000) {
+			const parsed = parseAnnouncements(cached.items)
+			if (parsed) sync(parsed, false)
+		}
+	} catch {
+		// Ignore malformed or expired cache payloads
+	}
+}
+function saveCache(next: RemoteAnnouncement[]) {
+	if (!cacheKey) return
+	try {
+		localStorage.setItem(cacheKey, JSON.stringify({ savedAt: Date.now(), items: next }))
+	} catch {
+		// localStorage may be unavailable (private mode / quota)
+	}
+}
+async function refresh() {
+	if (disposed) return
+	loadCache()
+	if (skinSiteStatus.value !== 'signed-in') return
+	try {
+		await waitForSkinSiteSession()
+		const token = await requestSkinSiteDownloadToken()
+		const response = await tauriFetch('https://skin.starlight.cool/starlight/skin/broadcast/all', {
+			method: 'GET',
+			headers: { Authorization: `Bearer ${token}` },
+		})
+		if (!response.ok) return
+		const data = await response.json()
+		const parsed = mapBroadcastAnnouncements((data as { payload?: unknown } | null)?.payload)
+		if (parsed && !disposed) {
+			sync(parsed, true)
+			saveCache(parsed)
+		}
+	} catch {
+		// Remote fetch failed; previously cached items remain displayed
+	}
+}
+async function openLink(value: unknown) {
+	const url = safeAnnouncementUrl(value)
+	if (!url) return
+	try {
+		await openUrl(url)
+	} catch {
+		// Opener may reject unknown schemes
+	}
+}
+function contentClick(event: MouseEvent) {
+	const link = event.target instanceof Element ? event.target.closest('a') : null
+	if (!link) return
+	event.preventDefault()
+	event.stopPropagation()
+	void openLink(link.getAttribute('href'))
+}
+function preview(type: RemoteAnnouncement['type'], withAction = false) {
+	if (!props.previewOnly || !props.ready || hasModal.value || disposed) return
+	const now = new Date().toISOString()
+	const item: RemoteAnnouncement = {
+		id: 'local-preview-' + type,
+		title: formatMessage(messages.previewTitle),
+		summary: formatMessage(messages.previewSummary),
+		content: formatMessage(messages.previewContent),
+		type,
+		priority: 'normal',
+		starts_at: now,
+		ends_at: null,
+		published_at: now,
+		action_label: withAction ? formatMessage(messages.previewAction) : null,
+		action_url: withAction ? 'https://skin.starlight.cool/' : null,
+	}
+	read.clear()
+	queuedThisSession.clear()
+	sync([item], true)
+}
+defineExpose({ preview })
+onMounted(() => {
+	if (props.previewOnly) return
+	try {
+		const saved = JSON.parse(localStorage.getItem(stateKey) ?? 'null')
+		if (saved && Array.isArray(saved.read))
+			for (const key of saved.read) if (typeof key === 'string') read.add(key)
+	} catch {
+		// Ignore malformed local read-state
+	}
+	window.addEventListener(OPEN_REMOTE_ANNOUNCEMENT_CENTER_EVENT, handleOpenCenter)
+	const start = () => {
+		if (disposed) return
+		void refresh()
+		interval = setInterval(() => {
+			sync(items, false)
+			advance()
+		}, 15000)
+	}
+	// Defer the startup request until after first paint.
+	if (typeof requestIdleCallback === 'function') {
+		requestIdleCallback(start, { timeout: 2000 })
+	} else {
+		setTimeout(start, 500)
+	}
+})
+watch(skinSiteStatus, (status) => {
+	if (disposed || props.previewOnly) return
+	if (status === 'signed-in') void refresh()
+})
+watch([() => props.ready, hasModal], () => {
+	if (advanceTimer) clearTimeout(advanceTimer)
+	advanceTimer = setTimeout(advance, 350)
+})
+onUnmounted(() => {
+	disposed = true
+	if (interval) clearInterval(interval)
+	if (advanceTimer) clearTimeout(advanceTimer)
+	window.removeEventListener(OPEN_REMOTE_ANNOUNCEMENT_CENTER_EVENT, handleOpenCenter)
+})
+</script>
+
+<template>
+	<div
+		v-if="startupNotice"
+		class="fixed right-4 top-16 z-50 w-[22rem] max-w-[calc(100vw-2rem)] rounded-xl border border-surface-5 bg-surface-3 p-3 shadow-lg"
+	>
+		<button class="w-full text-left" @click="startupNotice && openCenter(startupNotice)">
+			<div class="mb-1 text-xs font-semibold uppercase text-brand">
+				{{ formatMessage(messages.unread) }}
+			</div>
+			<div class="font-semibold text-[var(--color-text-primary)]">{{ startupNotice.title }}</div>
+			<div
+				v-if="startupNotice.summary"
+				class="mt-1 line-clamp-2 text-sm text-[var(--color-text-tertiary)]"
+			>
+				{{ startupNotice.summary }}
+			</div>
+		</button>
+	</div>
+	<NewModal
+		ref="modal"
+		:header="formatMessage(messages.centerTitle)"
+		:on-hide="closed"
+		max-width="80vw"
+		width="80vw"
+		max-content-height="calc(80vh - 8rem)"
+		scrollable
+	>
+		<div class="flex h-[calc(80vh-8rem)] min-h-0 gap-3">
+			<aside class="flex min-h-0 w-[32%] min-w-[14rem] flex-col border-r border-surface-5 pr-3">
+				<div class="mb-2 flex items-center justify-between">
+					<span class="font-semibold text-[var(--color-text-primary)]">{{
+						formatMessage(messages.centerTitle)
+					}}</span>
+					<Button
+						v-if="items.some((item) => !read.has(announcementKey(item)))"
+						@click="markAllRead"
+						>{{ formatMessage(messages.readAll) }}</Button
+					>
+				</div>
+				<div
+					v-if="!items.length"
+					class="py-8 text-center text-sm text-[var(--color-text-tertiary)]"
+				>
+					{{ formatMessage(messages.empty) }}
+				</div>
+				<div v-else class="flex min-h-0 flex-col gap-1 overflow-auto">
+					<button
+						v-for="item in items"
+						:key="announcementKey(item)"
+						class="flex items-start gap-2 rounded-lg p-2 text-left hover:bg-surface-4"
+						:class="{
+							'bg-surface-4': selected && announcementKey(selected) === announcementKey(item),
+						}"
+						@click="selectAnnouncement(item)"
+					>
+						<span
+							class="mt-1.5 size-2 shrink-0 rounded-full"
+							:class="read.has(announcementKey(item)) ? 'opacity-0' : 'bg-red'"
+						/>
+						<span class="min-w-0 flex-1">
+							<span class="block truncate font-medium text-[var(--color-text-primary)]">{{
+								item.title
+							}}</span>
+							<span class="block line-clamp-2 text-xs text-[var(--color-text-tertiary)]">{{
+								item.summary || item.content
+							}}</span>
+						</span>
+					</button>
+				</div>
+			</aside>
+			<section v-if="selected" class="min-h-0 min-w-0 flex-1 overflow-auto px-1">
+				<h2 class="mb-4 text-xl font-semibold text-[var(--color-text-primary)]">
+					{{ selected.title }}
+				</h2>
+				<div
+					class="markdown-body break-words"
+					@click="contentClick"
+					@auxclick="contentClick"
+					v-html="html"
+				/>
+				<div class="mt-4 flex justify-end">
+					<Button
+						v-if="selected.action_url && selected.action_label"
+						type="colored"
+						color="brand"
+						@click="openLink(selected.action_url)"
+						>{{ selected.action_label }}</Button
+					>
+				</div>
+			</section>
+			<div
+				v-else
+				class="flex flex-1 items-center justify-center text-sm text-[var(--color-text-tertiary)]"
+			>
+				{{ formatMessage(messages.empty) }}
+			</div>
+		</div>
+		<template #actions>
+			<div class="flex flex-wrap justify-end gap-2">
+				<Button @click="modal?.hide()">{{ formatMessage(commonMessages.closeButton) }} </Button>
+			</div>
+		</template>
+	</NewModal>
+</template>

apps/app-frontend/src/components/ui/instance_settings/WindowSettings.vue

@@ -36,24 +36,29 @@ const fullscreenSetting: Ref<boolean> = ref(
 	instance.value.force_fullscreen ?? globalSettings.force_fullscreen,
 )
 const maximizeWindowSetting = ref(instance.value.maximize_window ?? globalSettings.maximize_window)
+const windowTitle = ref(instance.value.window_title ?? '')
 
 const editInstanceObject = computed(() => {
+	const title = windowTitle.value.trim() ? windowTitle.value.trim() : null
 	if (!overrideWindowSettings.value) {
 		return {
 			force_fullscreen: null,
 			maximize_window: null,
 			game_resolution: null,
+			// The title is independent of the window-size override checkbox.
+			window_title: title,
 		}
 	}
 	return {
 		force_fullscreen: fullscreenSetting.value,
 		maximize_window: maximizeWindowSetting.value,
 		game_resolution: fullscreenSetting.value ? null : resolution.value,
+		window_title: title,
 	}
 })
 
 watch(
-	[overrideWindowSettings, resolution, fullscreenSetting, maximizeWindowSetting],
+	[overrideWindowSettings, resolution, fullscreenSetting, maximizeWindowSetting, windowTitle],
 	async () => {
 		await edit(instance.value.id, editInstanceObject.value)
 	},
@@ -109,6 +114,18 @@ const messages = defineMessages({
 		id: 'instance.settings.tabs.window.height.enter',
 		defaultMessage: 'Enter height...',
 	},
+	windowTitle: {
+		id: 'instance.settings.tabs.window.window-title',
+		defaultMessage: 'Window title',
+	},
+	windowTitleDescription: {
+		id: 'instance.settings.tabs.window.window-title.description',
+		defaultMessage: 'Customize the Minecraft window title. Leave empty to keep the default.',
+	},
+	enterWindowTitle: {
+		id: 'instance.settings.tabs.window.window-title.enter',
+		defaultMessage: 'Enter window title...',
+	},
 })
 </script>
 
@@ -200,5 +217,25 @@ const messages = defineMessages({
 				:placeholder="formatMessage(messages.enterHeight)"
 			/>
 		</div>
+		<div
+			v-if="globalSettings.custom_window_title_enabled"
+			class="flex items-center gap-4 justify-between"
+		>
+			<div class="flex flex-col gap-1">
+				<h2 class="m-0 inline-flex items-center gap-2 text-lg font-semibold text-contrast">
+					{{ formatMessage(messages.windowTitle) }}
+				</h2>
+				<p class="m-0">
+					{{ formatMessage(messages.windowTitleDescription) }}
+				</p>
+			</div>
+			<StyledInput
+				id="window-title"
+				v-model="windowTitle"
+				autocomplete="off"
+				type="text"
+				:placeholder="formatMessage(messages.enterWindowTitle)"
+			/>
+		</div>
 	</div>
 </template>

apps/app-frontend/src/components/ui/library/DraggableInstanceCard.vue

@@ -0,0 +1,92 @@
+<script setup lang="ts">
+import { KeyboardSensor, PointerSensor, useDraggable } from '@dnd-kit/vue'
+import { useEventListener } from '@vueuse/core'
+import { computed, ref } from 'vue'
+
+import type { GameInstance } from '@/helpers/types'
+
+const props = defineProps<{
+	instance: GameInstance
+	instanceGroupId: string
+	disabled: boolean
+}>()
+
+const emit = defineEmits<{
+	(e: 'contextmenu' | 'card-click', event: MouseEvent): void
+	(e: 'start-long-press' | 'cancel-long-press'): void
+}>()
+
+const cardElement = ref<HTMLElement>()
+
+const instanceCardSensors = [
+	PointerSensor.configure({
+		preventActivation: () => false,
+	}),
+	KeyboardSensor,
+]
+
+const dragDisabled = computed(() => props.disabled)
+
+const { isDragging } = useDraggable({
+	id: computed(() => `instance:${props.instanceGroupId}:${props.instance.id}`),
+	element: cardElement,
+	disabled: dragDisabled,
+	sensors: instanceCardSensors,
+	data: computed(() => ({
+		instanceId: props.instance.id,
+		fromGroup: props.instanceGroupId,
+	})),
+})
+
+let wantsClick = false
+
+useEventListener(window, 'pointerdown', () => {
+	wantsClick = true
+})
+useEventListener(window, 'pointerup', () => {
+	if (isDragging.value) {
+		wantsClick = false
+	}
+})
+useEventListener(window, 'blur', () => {
+	wantsClick = false
+})
+
+function onCardClick(event: MouseEvent) {
+	if (!wantsClick || isDragging.value) return
+	wantsClick = false
+	emit('card-click', event)
+}
+
+function onContextMenu(event: MouseEvent) {
+	emit('contextmenu', event)
+}
+
+function onMouseDown() {
+	if (!dragDisabled.value) {
+		emit('start-long-press')
+	}
+}
+
+function onMouseUp() {
+	emit('cancel-long-press')
+}
+</script>
+
+<template>
+	<div
+		ref="cardElement"
+		class="group relative min-w-0 w-full"
+		@click="onCardClick"
+		@mousedown="onMouseDown"
+		@mouseup="onMouseUp"
+		@mouseleave="onMouseUp"
+		@touchstart="!dragDisabled && onMouseDown()"
+		@touchend="onMouseUp"
+		@touchcancel="onMouseUp"
+		@contextmenu.prevent.stop="onContextMenu"
+	>
+		<slot :is-dragging="isDragging" />
+		<slot v-if="!isDragging" name="overlay" />
+	</div>
+</template>

apps/app-frontend/src/components/ui/library/InstanceGroup.vue

@@ -0,0 +1,521 @@
+<script setup lang="ts">
+import { useDroppable } from '@dnd-kit/vue'
+import {
+	ArrowDownIcon,
+	ArrowUpIcon,
+	DropdownIcon,
+	EditIcon,
+	PlusIcon,
+	TrashIcon,
+	XIcon,
+} from '@modrinth/assets'
+import {
+	Button,
+	Checkbox,
+	commonMessages,
+	defineMessages,
+	IconButton,
+	InlineEditableText,
+	NewModal,
+	TagItem,
+	useVIntl,
+} from '@modrinth/ui'
+import { computed, nextTick, ref, watch } from 'vue'
+
+import ContextMenu from '@/components/ui/ContextMenu.vue'
+import Instance from '@/components/ui/Instance.vue'
+import DraggableInstanceCard from '@/components/ui/library/DraggableInstanceCard.vue'
+import { UNGROUPED_GROUP_KEY } from '@/composables/useGridGrouping'
+import { FAVORITES_GROUP_ID } from '@/composables/useInstanceGroups'
+import type { GameInstance } from '@/helpers/types'
+
+const MAX_GROUP_NAME_LENGTH = 256
+
+const { formatMessage } = useVIntl()
+
+const messages = defineMessages({
+	ungrouped: { id: 'app.instances.group.ungrouped', defaultMessage: 'No group' },
+	pinned: { id: 'app.instances.group.pinned', defaultMessage: 'Pinned' },
+	emptyGroup: {
+		id: 'app.instances.group.empty',
+		defaultMessage: 'Drag and drop to add instances.',
+	},
+	editGroupName: {
+		id: 'app.instances.group.edit-name',
+		defaultMessage: 'Edit group name',
+	},
+	deleteGroup: {
+		id: 'app.instances.group.delete-group',
+		defaultMessage: 'Delete group',
+	},
+	deleteGroupDescription: {
+		id: 'app.instances.group.delete-description',
+		defaultMessage: 'Instances in this group will be ungrouped.',
+	},
+	moveGroupUp: {
+		id: 'app.instances.group.move-up',
+		defaultMessage: 'Move group up',
+	},
+	moveGroupDown: {
+		id: 'app.instances.group.move-down',
+		defaultMessage: 'Move group down',
+	},
+	addToGroup: {
+		id: 'app.instances.group.add-to-group',
+		defaultMessage: 'Add to group',
+	},
+	newInstance: {
+		id: 'app.instances.group.new-instance',
+		defaultMessage: 'New instance',
+	},
+	collapseGroup: {
+		id: 'app.instances.group.collapse',
+		defaultMessage: 'Collapse group',
+	},
+	expandGroup: {
+		id: 'app.instances.group.expand',
+		defaultMessage: 'Expand group',
+	},
+	renameGroup: {
+		id: 'app.instances.group.rename-group',
+		defaultMessage: 'Rename group',
+	},
+	groupNameEmpty: {
+		id: 'app.instances.group.name-empty',
+		defaultMessage: 'Group names cannot be empty.',
+	},
+	groupNameTooLong: {
+		id: 'app.instances.group.name-too-long',
+		defaultMessage: 'Group names cannot be longer than {maxLength} characters.',
+	},
+})
+
+const props = defineProps<{
+	sectionKey: string
+	groupName?: string
+	instances: GameInstance[]
+	grouping: string
+	isCollapsed: boolean
+	displayMode: string
+	selectMode: boolean
+	selectedInstanceIds: Set<string>
+	isSortAscending?: boolean
+	hideHeader?: boolean
+	canMoveUp?: boolean
+	canMoveDown?: boolean
+	groupPendingNameEdit?: string | null
+}>()
+
+// Events are grouped only where the payload shapes genuinely match; the
+// per-event names are documentation, not part of the type.
+const emit = defineEmits<{
+	(e: 'toggleCollapse' | 'deleteGroup' | 'addToGroup' | 'startLongPress', id: string): void
+	(e: 'handleCheckboxClick' | 'handleCardClick', instanceId: string, event: MouseEvent): void
+	(e: 'handleContextMenu', event: MouseEvent, instanceId: string, sectionKey: string): void
+	(e: 'renameGroup', oldKey: string, newKey: string): void
+	(e: 'cancelLongPress' | 'newInstance' | 'renameComplete'): void
+	(e: 'moveGroup', groupKey: string, direction: -1 | 1): void
+}>()
+
+const groupOptions = ref<InstanceType<typeof ContextMenu>>()
+const groupContainerRef = ref<HTMLElement>()
+const groupNameInput = ref<InstanceType<typeof InlineEditableText>>()
+const deletingGroup = ref(false)
+const confirmDeleteGroupModal = ref<InstanceType<typeof NewModal>>()
+const groupName = ref(props.groupName ?? props.sectionKey)
+
+const isUngrouped = computed(() => props.sectionKey === UNGROUPED_GROUP_KEY)
+const isFavorites = computed(() => props.sectionKey === FAVORITES_GROUP_ID)
+const isCustomGroup = computed(
+	() => props.grouping === 'Group' && !isUngrouped.value && !isFavorites.value,
+)
+const isGroupDragActive = computed(() => props.grouping === 'Group')
+const effectiveCollapsed = computed(() => (props.hideHeader ? false : props.isCollapsed))
+
+const { isDropTarget } = useDroppable({
+	id: computed(() => `instance-group:${props.sectionKey}`),
+	element: groupContainerRef,
+	disabled: computed(() => props.hideHeader || !isGroupDragActive.value),
+	data: computed(() => ({
+		groupId: props.sectionKey,
+	})),
+})
+
+watch(
+	() => [props.sectionKey, props.groupName],
+	() => {
+		groupName.value = props.groupName ?? props.sectionKey
+	},
+)
+
+watch(
+	() => props.groupPendingNameEdit,
+	async (pendingId) => {
+		if (pendingId !== props.sectionKey) return
+
+		await nextTick()
+		groupContainerRef.value?.scrollIntoView({ block: 'nearest' })
+		await groupNameInput.value?.startEditing()
+		emit('renameComplete')
+	},
+	{ immediate: true, flush: 'post' },
+)
+
+function validateGroupName(value: string) {
+	const normalized = value.trim()
+	if (normalized.length === 0) return false
+	if (normalized.length > MAX_GROUP_NAME_LENGTH) return false
+	return true
+}
+
+async function updateGroupName(value: string) {
+	const newName = value.trim()
+	if (!newName || newName === groupName.value) return false
+	emit('renameGroup', props.sectionKey, newName)
+	return true
+}
+
+function openGroupContextMenu(event: MouseEvent) {
+	groupOptions.value?.showMenu(
+		event,
+		props.sectionKey,
+		isCustomGroup.value
+			? [
+					{ name: 'new_instance' },
+					{ name: 'add_instances' },
+					{ name: 'edit_name' },
+					{ type: 'divider' },
+					{ name: 'delete_group', color: 'danger' },
+				]
+			: [{ name: 'new_instance' }],
+	)
+}
+
+async function handleGroupOption({ option }: { option: string }) {
+	if (option === 'new_instance') {
+		emit('newInstance')
+	} else if (option === 'add_instances') {
+		emit('addToGroup', props.sectionKey)
+	} else if (option === 'edit_name') {
+		groupNameInput.value?.startEditing()
+	} else if (option === 'delete_group') {
+		requestGroupDeletion()
+	}
+}
+
+function requestGroupDeletion() {
+	if (isUngrouped.value || isFavorites.value) return
+
+	if (props.instances.length > 0) {
+		confirmDeleteGroupModal.value?.show()
+	} else {
+		void removeGroup()
+	}
+}
+
+async function removeGroup() {
+	if (deletingGroup.value) return
+
+	deletingGroup.value = true
+	emit('deleteGroup', props.sectionKey)
+	setTimeout(() => {
+		deletingGroup.value = false
+		confirmDeleteGroupModal.value?.hide()
+	}, 300)
+}
+
+function onCardClick(instanceId: string, event: MouseEvent) {
+	emit('handleCardClick', instanceId, event)
+}
+
+function onStartLongPress(instanceId: string) {
+	emit('startLongPress', instanceId)
+}
+</script>
+
+<template>
+	<div
+		ref="groupContainerRef"
+		class="instance-group group/instance-container relative select-none pb-3"
+		@contextmenu.prevent.stop="openGroupContextMenu"
+	>
+		<div
+			v-if="!hideHeader && isDropTarget && isGroupDragActive"
+			class="pointer-events-none absolute -inset-2 inset-y-0 z-20 rounded-xl border-2 border-dashed border-contrast opacity-40 bg-transparent transition-opacity duration-150"
+		/>
+		<div
+			v-if="!hideHeader && (grouping === 'Group' || sectionKey !== UNGROUPED_GROUP_KEY)"
+			class="group/header flex h-10 w-full items-center gap-2 border-0 border-b border-solid border-b-surface-5"
+			:class="{ 'group-drag-handle cursor-grab': isCustomGroup }"
+		>
+			<div
+				class="flex min-w-0 cursor-pointer items-center gap-2"
+				@click="emit('toggleCollapse', sectionKey)"
+			>
+				<button
+					class="flex shrink-0 items-center border-0 bg-transparent p-0 cursor-pointer"
+					type="button"
+					:aria-expanded="!effectiveCollapsed"
+					:aria-label="
+						formatMessage(effectiveCollapsed ? messages.expandGroup : messages.collapseGroup)
+					"
+					@click.stop="emit('toggleCollapse', sectionKey)"
+				>
+					<DropdownIcon
+						class="size-5 shrink-0 text-[var(--color-text-tertiary)] transition-transform duration-300"
+						:class="{ 'rotate-180': !effectiveCollapsed }"
+					/>
+				</button>
+				<InlineEditableText
+					v-if="!isUngrouped && !isFavorites"
+					ref="groupNameInput"
+					v-model="groupName"
+					activation-mode="manual"
+					class="text-base font-semibold !h-10 text-[var(--color-text-default)] select-none"
+					max-width="24rem"
+					:max-length="MAX_GROUP_NAME_LENGTH"
+					:on-change="updateGroupName"
+					:validate="validateGroupName"
+				/>
+				<span v-else class="text-base font-semibold text-[var(--color-text-default)] select-none">
+					{{ isFavorites ? formatMessage(messages.pinned) : formatMessage(messages.ungrouped) }}
+				</span>
+				<TagItem v-if="instances.length" class="shrink-0 border-surface-3 bg-surface-2">
+					{{ instances.length }}
+				</TagItem>
+			</div>
+			<div class="min-w-0 flex-1" />
+			<div
+				v-if="isCustomGroup"
+				class="flex shrink-0 items-center opacity-0 transition-opacity duration-250 group-hover/header:opacity-100 focus-within:opacity-100"
+			>
+				<IconButton
+					v-tooltip="formatMessage(messages.moveGroupUp)"
+					:label="formatMessage(messages.moveGroupUp)"
+					type="quiet"
+					size="sm"
+					:disabled="!canMoveUp"
+					@click.stop="emit('moveGroup', sectionKey, -1)"
+				>
+					<ArrowUpIcon />
+				</IconButton>
+				<IconButton
+					v-tooltip="formatMessage(messages.moveGroupDown)"
+					:label="formatMessage(messages.moveGroupDown)"
+					type="quiet"
+					size="sm"
+					:disabled="!canMoveDown"
+					@click.stop="emit('moveGroup', sectionKey, 1)"
+				>
+					<ArrowDownIcon />
+				</IconButton>
+				<IconButton
+					v-tooltip="formatMessage(messages.editGroupName)"
+					:label="formatMessage(messages.editGroupName)"
+					type="quiet"
+					size="sm"
+					@click.stop="groupNameInput?.startEditing()"
+				>
+					<EditIcon />
+				</IconButton>
+				<IconButton
+					v-tooltip="formatMessage(messages.addToGroup)"
+					:label="formatMessage(messages.addToGroup)"
+					type="quiet"
+					size="sm"
+					@click.stop="emit('addToGroup', sectionKey)"
+				>
+					<PlusIcon />
+				</IconButton>
+				<IconButton
+					v-tooltip="formatMessage(messages.deleteGroup)"
+					:label="formatMessage(messages.deleteGroup)"
+					type="quiet"
+					size="sm"
+					:disabled="deletingGroup"
+					@click.stop="handleGroupOption({ option: 'delete_group' })"
+				>
+					<TrashIcon />
+				</IconButton>
+			</div>
+		</div>
+		<div v-if="!effectiveCollapsed" class="mt-2.5">
+			<section
+				class="grid grid-cols-[repeat(auto-fill,minmax(16rem,1fr))] w-full gap-3 mr-auto scroll-smooth overflow-y-auto"
+				:class="{
+					'grid-cols-[repeat(auto-fill,minmax(13rem,1fr))] gap-4': displayMode === 'cards',
+				}"
+			>
+				<template v-for="instance in instances" :key="instance.id">
+					<DraggableInstanceCard
+						v-if="isGroupDragActive"
+						:instance="instance"
+						:instance-group-id="sectionKey"
+						:disabled="selectMode"
+						@card-click="(event: MouseEvent) => onCardClick(instance.id, event)"
+						@contextmenu="
+							(event: MouseEvent) => emit('handleContextMenu', event, instance.id, props.sectionKey)
+						"
+						@start-long-press="onStartLongPress(instance.id)"
+						@cancel-long-press="emit('cancelLongPress')"
+					>
+						<template #default="{ isDragging }">
+							<div
+								:class="{
+									'pointer-events-none': selectMode,
+									'relative cursor-pointer select-none rounded-lg transition-all hover:brightness-90 active:scale-[0.98]': true,
+								}"
+								@click.capture="
+									(event: MouseEvent) => {
+										if (event.shiftKey && !selectMode) {
+											event.stopPropagation()
+											emit('handleCardClick', instance.id, event)
+										}
+									}
+								"
+							>
+								<Instance
+									:instance="instance"
+									:disabled="selectMode || isDragging"
+									:variant="displayMode === 'cards' ? 'library' : 'standard'"
+									:class="{
+										'opacity-50': selectMode && !selectedInstanceIds.has(instance.id),
+									}"
+								/>
+							</div>
+						</template>
+						<template #overlay>
+							<div
+								class="absolute right-2 bottom-2 z-10 transition-opacity"
+								:class="
+									selectMode && selectedInstanceIds.has(instance.id)
+										? ''
+										: 'opacity-0 group-hover:opacity-100'
+								"
+								@click.stop="emit('handleCheckboxClick', instance.id, $event)"
+							>
+								<Checkbox :model-value="selectedInstanceIds.has(instance.id)" />
+							</div>
+							<div
+								v-if="!selectMode"
+								class="absolute right-2 top-2 opacity-0 group-hover:opacity-100 transition-opacity"
+								@click.stop="
+									emit('handleContextMenu', $event as MouseEvent, instance.id, props.sectionKey)
+								"
+							>
+								<Button type="quiet" size="2xs" circular icon-only
+									><slot name="moreIcon" />
+								</Button>
+							</div>
+						</template>
+					</DraggableInstanceCard>
+
+					<div v-else class="group relative">
+						<div
+							class="relative cursor-pointer select-none rounded-lg transition-all hover:brightness-90 active:scale-[0.98]"
+							@click.capture="
+								(event: MouseEvent) => {
+									if (event.shiftKey && !selectMode) {
+										event.stopPropagation()
+										emit('handleCardClick', instance.id, event)
+									}
+								}
+							"
+							@click="emit('handleCardClick', instance.id, $event as MouseEvent)"
+							@mousedown="!selectMode && emit('startLongPress', instance.id)"
+							@mouseup="emit('cancelLongPress')"
+							@mouseleave="emit('cancelLongPress')"
+							@touchstart="!selectMode && emit('startLongPress', instance.id)"
+							@touchend="emit('cancelLongPress')"
+							@touchcancel="emit('cancelLongPress')"
+						>
+							<div :class="{ 'pointer-events-none': selectMode }">
+								<Instance
+									:instance="instance"
+									:disabled="selectMode"
+									:variant="displayMode === 'cards' ? 'library' : 'standard'"
+									:class="{
+										'opacity-50': selectMode && !selectedInstanceIds.has(instance.id),
+									}"
+									@contextmenu.prevent.stop="
+										(event: MouseEvent) =>
+											emit('handleContextMenu', event, instance.id, props.sectionKey)
+									"
+								/>
+							</div>
+						</div>
+						<div
+							class="absolute right-2 bottom-2 z-10 transition-opacity"
+							:class="
+								selectMode && selectedInstanceIds.has(instance.id)
+									? ''
+									: 'opacity-0 group-hover:opacity-100'
+							"
+							@click.stop="emit('handleCheckboxClick', instance.id, $event)"
+						>
+							<Checkbox :model-value="selectedInstanceIds.has(instance.id)" />
+						</div>
+						<div
+							v-if="!selectMode"
+							class="absolute right-2 top-2 opacity-0 group-hover:opacity-100 transition-opacity"
+							@click.stop="
+								emit('handleContextMenu', $event as MouseEvent, instance.id, props.sectionKey)
+							"
+						>
+							<Button type="quiet" size="2xs" circular icon-only><slot name="moreIcon" /> </Button>
+						</div>
+					</div>
+				</template>
+				<p
+					v-if="instances.length === 0"
+					class="col-span-full m-0 pt-1 pl-0.5 text-base font-base text-[var(--color-text-tertiary)] opacity-80"
+				>
+					{{ formatMessage(messages.emptyGroup) }}
+				</p>
+			</section>
+		</div>
+	</div>
+
+	<ContextMenu ref="groupOptions" @option-clicked="handleGroupOption">
+		<template #new_instance>
+			<PlusIcon />
+			{{ formatMessage(messages.newInstance) }}
+		</template>
+		<template #add_instances>
+			<PlusIcon />
+			{{ formatMessage(messages.addToGroup) }}
+		</template>
+		<template #edit_name>
+			<EditIcon />
+			{{ formatMessage(messages.editGroupName) }}
+		</template>
+		<template #delete_group>
+			<TrashIcon />
+			{{ formatMessage(messages.deleteGroup) }}
+		</template>
+	</ContextMenu>
+
+	<NewModal
+		ref="confirmDeleteGroupModal"
+		:header="formatMessage(messages.deleteGroup)"
+		fade="danger"
+		width="500px"
+	>
+		<p class="m-0 text-base text-[var(--color-text-default)]">
+			{{ formatMessage(messages.deleteGroupDescription) }}
+		</p>
+
+		<template #actions>
+			<div class="flex justify-end gap-2">
+				<Button type="outlined" @click="confirmDeleteGroupModal?.hide()">
+					<XIcon />
+					{{ formatMessage(commonMessages.cancelButton) }}
+				</Button>
+				<Button type="colored" color="red" :disabled="deletingGroup" @click="removeGroup">
+					<TrashIcon />
+					{{ formatMessage(messages.deleteGroup) }}
+				</Button>
+			</div>
+		</template>
+	</NewModal>
+</template>

apps/app-frontend/src/components/ui/modal/InstanceGroupModal.vue

@@ -0,0 +1,313 @@
+<template>
+	<NewModal ref="modal" no-padding scrollable actions-divider max-width="560px" width="560px">
+		<template #title>
+			<span class="text-2xl font-semibold text-[var(--color-text-primary)]">
+				{{
+					existingGroupName
+						? formatMessage(messages.addToGroupTitle, { groupName: existingGroupName })
+						: formatMessage(messages.header)
+				}}
+			</span>
+		</template>
+
+		<template v-if="!existingGroupName">
+			<div class="flex flex-col gap-2.5 p-6">
+				<label for="new-group-name" class="font-semibold text-[var(--color-text-primary)]">
+					{{ formatMessage(messages.groupName) }}
+				</label>
+				<StyledInput
+					id="new-group-name"
+					ref="groupNameInput"
+					v-model="newGroupName"
+					:placeholder="formatMessage(messages.groupNamePlaceholder)"
+					:maxlength="32"
+					@click="groupNameInput?.select()"
+				/>
+			</div>
+
+			<div class="h-px bg-divider" />
+		</template>
+
+		<div class="flex h-[400px] flex-col gap-3 overflow-y-auto bg-surface-2 py-4">
+			<div class="px-6">
+				<StyledInput
+					v-model="newGroupSearch"
+					:icon="SearchIcon"
+					:placeholder="formatMessage(messages.searchInstance)"
+					class="w-full"
+				/>
+			</div>
+
+			<div
+				v-if="newGroupInstances.length === 0"
+				class="flex items-center justify-center py-12 text-[var(--color-text-tertiary)]"
+			>
+				{{ formatMessage(messages.noInstancesFound) }}
+			</div>
+			<div v-else class="flex flex-col gap-1">
+				<div
+					v-for="instance in newGroupInstances"
+					:key="instance.id"
+					class="flex items-center justify-between gap-4 px-6 py-1.5 hover:bg-surface-3"
+					:class="{ 'opacity-60': selectedNewGroupInstanceIds.has(instance.id) }"
+				>
+					<div class="flex min-w-0 items-center gap-2.5">
+						<InstanceIcon
+							:icon-path="instance.icon_path"
+							:instance-id="instance.id"
+							:loader="instance.loader"
+							class="!size-[2rem] !rounded-md"
+						/>
+						<div class="flex min-w-0 items-center gap-2">
+							<span class="truncate font-semibold text-[var(--color-text-primary)]">{{
+								instance.name
+							}}</span>
+							<TagItem v-if="instance.groups && instance.groups.length > 0" class="shrink-0">
+								{{ getGroupName(instance.groups[0]) }}
+							</TagItem>
+						</div>
+					</div>
+					<Button
+						:type="selectedNewGroupInstanceIds.has(instance.id) ? 'outlined' : 'base'"
+						@click="toggleNewGroupInstance(instance.id)"
+					>
+						<CheckIcon v-if="selectedNewGroupInstanceIds.has(instance.id)" />
+						{{
+							formatMessage(
+								selectedNewGroupInstanceIds.has(instance.id) ? messages.added : messages.add,
+							)
+						}}
+					</Button>
+				</div>
+			</div>
+		</div>
+
+		<template #actions>
+			<div class="flex items-center justify-end gap-2">
+				<Button type="outlined" @click="modal?.hide()">
+					<XIcon />
+					{{ formatMessage(messages.cancel) }}
+				</Button>
+				<Button
+					type="colored"
+					color="brand"
+					:disabled="existingGroupName ? !canSaveGroups : !canCreateGroup"
+					@click="existingGroupName ? handleSaveGroups() : handleCreateGroup()"
+				>
+					<SpinnerIcon v-if="creatingGroup" class="animate-spin" />
+					<CheckIcon v-else-if="existingGroupName" />
+					<PlusIcon v-else />
+					{{ formatMessage(existingGroupName ? messages.saveChanges : messages.createGroup) }}
+				</Button>
+			</div>
+		</template>
+	</NewModal>
+</template>
+
+<script setup lang="ts">
+import { CheckIcon, PlusIcon, SearchIcon, SpinnerIcon, XIcon } from '@modrinth/assets'
+import { Button, defineMessages, NewModal, StyledInput, TagItem, useVIntl } from '@modrinth/ui'
+import { computed, ref } from 'vue'
+
+import InstanceIcon from '@/components/ui/InstanceIcon.vue'
+import { FAVORITES_GROUP_ID } from '@/composables/useInstanceGroups'
+import { list } from '@/helpers/instance'
+import { create_group, list_groups, set_group_memberships } from '@/helpers/instance-groups'
+import type { GameInstance } from '@/helpers/types'
+
+const { formatMessage } = useVIntl()
+
+const props = defineProps<{
+	instanceIds: string[]
+	existingGroupName?: string
+	existingGroupId?: string
+}>()
+
+const emit = defineEmits<{
+	(e: 'applied'): void
+}>()
+
+const messages = defineMessages({
+	header: {
+		id: 'app.instances.batch-edit-groups.header',
+		defaultMessage: 'Create group',
+	},
+	addToGroupTitle: {
+		id: 'app.instances.batch-edit-groups.add-to-group-title',
+		defaultMessage: 'Add instances to "{groupName}"',
+	},
+	groupName: {
+		id: 'app.instances.batch-edit-groups.group-name',
+		defaultMessage: 'Group name',
+	},
+	groupNamePlaceholder: {
+		id: 'app.instances.batch-edit-groups.group-name-placeholder',
+		defaultMessage: 'Enter group name',
+	},
+	searchInstance: {
+		id: 'app.instances.batch-edit-groups.search-instance',
+		defaultMessage: 'Search instances',
+	},
+	noInstancesFound: {
+		id: 'app.instances.batch-edit-groups.no-instances-found',
+		defaultMessage: 'No instances found',
+	},
+	add: {
+		id: 'app.instances.batch-edit-groups.add',
+		defaultMessage: 'Add',
+	},
+	added: {
+		id: 'app.instances.batch-edit-groups.added',
+		defaultMessage: 'Added',
+	},
+	cancel: {
+		id: 'app.instances.batch-edit-groups.cancel',
+		defaultMessage: 'Cancel',
+	},
+	createGroup: {
+		id: 'app.instances.batch-edit-groups.create',
+		defaultMessage: 'Create group',
+	},
+	pinnedGroupName: {
+		id: 'app.instances.group.pinned',
+		defaultMessage: 'Pinned',
+	},
+	saveChanges: {
+		id: 'app.instances.batch-edit-groups.save-changes',
+		defaultMessage: 'Save',
+	},
+})
+
+const modal = ref<InstanceType<typeof NewModal>>()
+const groupNameInput = ref<InstanceType<typeof StyledInput>>()
+const newGroupName = ref('')
+const newGroupSearch = ref('')
+const creatingGroup = ref(false)
+const allInstances = ref<GameInstance[]>([])
+const groupNameMap = ref(new Map<string, string>())
+const selectedNewGroupInstanceIds = ref(new Set<string>())
+
+const canCreateGroup = computed(() => newGroupName.value.trim().length > 0)
+
+const canSaveGroups = computed(() => {
+	if (!props.existingGroupName) return false
+	const groupId = props.existingGroupId
+	if (!groupId) return false
+	return allInstances.value.some((instance) => {
+		const isSelected = selectedNewGroupInstanceIds.value.has(instance.id)
+		const hasGroup = (instance.groups || []).includes(groupId)
+		return isSelected !== hasGroup
+	})
+})
+
+const newGroupInstances = computed(() => {
+	const search = newGroupSearch.value.toLowerCase()
+	return allInstances.value.filter((instance) => {
+		if (!search) return true
+		return instance.name.toLowerCase().includes(search)
+	})
+})
+
+function getGroupName(groupId: string) {
+	if (groupId === FAVORITES_GROUP_ID) {
+		return formatMessage(messages.pinnedGroupName)
+	}
+	return groupNameMap.value.get(groupId) || groupId
+}
+
+function show(ids?: string[]) {
+	newGroupSearch.value = ''
+	creatingGroup.value = false
+	Promise.all([list(), list_groups()]).then(([instances, groups]) => {
+		allInstances.value = instances as GameInstance[]
+		const map = new Map<string, string>()
+		for (const g of groups) {
+			map.set(g.id, g.name)
+		}
+		groupNameMap.value = map
+
+		if (!props.existingGroupName) {
+			const customGroups = groups.filter((g: { id: string }) => g.id !== 'group:favorites')
+			let groupNumber = customGroups.length + 1
+			const existingNames = new Set(groups.map((g: { name: string }) => g.name.toLowerCase()))
+			while (existingNames.has(`group ${groupNumber}`)) {
+				groupNumber++
+			}
+			newGroupName.value = `Group ${groupNumber}`
+		}
+
+		if (props.existingGroupName) {
+			const groupId = props.existingGroupId
+			selectedNewGroupInstanceIds.value = new Set(
+				allInstances.value.filter((i) => (i.groups || []).includes(groupId || '')).map((i) => i.id),
+			)
+		} else {
+			selectedNewGroupInstanceIds.value = new Set(ids ?? props.instanceIds)
+		}
+	})
+	modal.value?.show()
+}
+
+function toggleNewGroupInstance(instanceId: string) {
+	const next = new Set(selectedNewGroupInstanceIds.value)
+	if (next.has(instanceId)) {
+		next.delete(instanceId)
+	} else {
+		next.add(instanceId)
+	}
+	selectedNewGroupInstanceIds.value = next
+}
+
+async function handleCreateGroup() {
+	const name = newGroupName.value.trim()
+	if (!name || selectedNewGroupInstanceIds.value.size === 0) return
+
+	creatingGroup.value = true
+
+	const group = await create_group(name).catch(() => null)
+	if (!group) {
+		creatingGroup.value = false
+		return
+	}
+
+	if (selectedNewGroupInstanceIds.value.size > 0) {
+		const updates = [...selectedNewGroupInstanceIds.value].map((instanceId) => ({
+			instance_id: instanceId,
+			group_ids: [group.id],
+		}))
+		await set_group_memberships(updates).catch(() => {})
+	}
+
+	creatingGroup.value = false
+	modal.value?.hide()
+	emit('applied')
+}
+
+async function handleSaveGroups() {
+	if (!props.existingGroupName) return
+
+	creatingGroup.value = true
+	const groupId = props.existingGroupId
+
+	const changedInstances = allInstances.value.filter((instance) => {
+		const isSelected = selectedNewGroupInstanceIds.value.has(instance.id)
+		const hasGroup = (instance.groups || []).includes(groupId || '')
+		return isSelected !== hasGroup
+	})
+
+	const updates = changedInstances.map((instance) => {
+		const isSelected = selectedNewGroupInstanceIds.value.has(instance.id)
+		return {
+			instance_id: instance.id,
+			group_ids: isSelected ? [groupId!] : [],
+		}
+	})
+	await set_group_memberships(updates).catch(() => {})
+
+	creatingGroup.value = false
+	modal.value?.hide()
+	emit('applied')
+}
+
+defineExpose({ show })
+</script>

apps/app-frontend/src/components/ui/settings/DefaultInstanceSettings.vue

@@ -38,6 +38,26 @@ const messages = defineMessages({
 		id: 'app.settings.defaults.maximize-window.unsupported',
 		defaultMessage: 'Not supported on this operating system.',
 	},
+	windowTitleEnabled: {
+		id: 'app.settings.defaults.window-title.enabled',
+		defaultMessage: 'Custom Minecraft window title',
+	},
+	windowTitleEnabledDescription: {
+		id: 'app.settings.defaults.window-title.enabled-description',
+		defaultMessage: 'Allow instances to customize the Minecraft window title.',
+	},
+	defaultWindowTitle: {
+		id: 'app.settings.defaults.window-title.default',
+		defaultMessage: 'Default window title',
+	},
+	defaultWindowTitleDescription: {
+		id: 'app.settings.defaults.window-title.default-description',
+		defaultMessage: 'Used when an instance leaves its window title empty.',
+	},
+	defaultWindowTitlePlaceholder: {
+		id: 'app.settings.defaults.window-title.default-placeholder',
+		defaultMessage: 'Enter default window title...',
+	},
 	width: { id: 'app.settings.defaults.width', defaultMessage: 'Width' },
 	widthDescription: {
 		id: 'app.settings.defaults.width-description',
@@ -212,6 +232,36 @@ watch(
 					/>
 				</template>
 			</SettingsRow>
+			<SettingsRow>
+				<template #label>
+					<span id="settings-target-defaults-window-title" tabindex="-1">
+						{{ formatMessage(messages.windowTitleEnabled) }}
+					</span>
+				</template>
+				<template #description>{{
+					formatMessage(messages.windowTitleEnabledDescription)
+				}}</template>
+				<template #control>
+					<Toggle id="custom-window-title-enabled" v-model="settings.custom_window_title_enabled" />
+				</template>
+			</SettingsRow>
+			<SettingsRow stacked>
+				<template #label>{{ formatMessage(messages.defaultWindowTitle) }}</template>
+				<template #description>{{
+					formatMessage(messages.defaultWindowTitleDescription)
+				}}</template>
+				<template #control>
+					<StyledInput
+						id="default-window-title"
+						v-model="settings.default_window_title"
+						:disabled="!settings.custom_window_title_enabled"
+						autocomplete="off"
+						type="text"
+						:placeholder="formatMessage(messages.defaultWindowTitlePlaceholder)"
+						wrapper-class="w-full"
+					/>
+				</template>
+			</SettingsRow>
 		</SettingsSection>
 
 		<SettingsSection>

apps/app-frontend/src/components/ui/settings/LogExportModal.vue

@@ -0,0 +1,192 @@
+<script setup lang="ts">
+import { DownloadIcon, FolderOpenIcon, XIcon } from '@modrinth/assets'
+import {
+	Button,
+	Checkbox,
+	Combobox,
+	commonMessages,
+	defineMessages,
+	injectNotificationManager,
+	injectPopupNotificationManager,
+	NewModal,
+	useVIntl,
+} from '@modrinth/ui'
+import { computed, ref } from 'vue'
+
+import { exportLauncherLogs, highlightInFolder } from '@/helpers/utils'
+
+const { formatMessage } = useVIntl()
+const { handleError } = injectNotificationManager()
+const popupNotificationManager = injectPopupNotificationManager()
+
+const modal = ref<InstanceType<typeof NewModal>>()
+const exporting = ref(false)
+const selectedRange = ref<'last30Minutes' | 'last2Hours' | 'all'>('last2Hours')
+const selectedLevel = ref<'all' | 'debug' | 'info'>('all')
+const includeSystemInfo = ref(true)
+const includeInstanceLogs = ref(false)
+const includeCrashAnalysis = ref(false)
+
+const messages = defineMessages({
+	title: { id: 'app.settings.logs.export.modal.title', defaultMessage: 'Export logs' },
+	description: {
+		id: 'app.settings.logs.export.modal.description',
+		defaultMessage:
+			'Choose how much detail to include. Exported logs have access tokens, Minecraft tokens, and IP addresses replaced with placeholders.',
+	},
+	rangeLabel: { id: 'app.settings.logs.export.modal.range', defaultMessage: 'Time range' },
+	rangeLast30Minutes: {
+		id: 'app.settings.logs.export.modal.range.30-minutes',
+		defaultMessage: 'Last 30 minutes',
+	},
+	rangeLast2Hours: {
+		id: 'app.settings.logs.export.modal.range.2-hours',
+		defaultMessage: 'Last 2 hours',
+	},
+	rangeAll: { id: 'app.settings.logs.export.modal.range.all', defaultMessage: 'All sessions' },
+	levelLabel: { id: 'app.settings.logs.export.modal.level', defaultMessage: 'Log level' },
+	levelAll: { id: 'app.settings.logs.export.modal.level.all', defaultMessage: 'All levels' },
+	levelDebug: {
+		id: 'app.settings.logs.export.modal.level.debug',
+		defaultMessage: 'Debug and above',
+	},
+	levelInfo: { id: 'app.settings.logs.export.modal.level.info', defaultMessage: 'Info and above' },
+	extrasLabel: {
+		id: 'app.settings.logs.export.modal.extras',
+		defaultMessage: 'Additional information',
+	},
+	systemInfo: {
+		id: 'app.settings.logs.export.modal.system-info',
+		defaultMessage: 'System and environment summary',
+	},
+	instanceLogs: {
+		id: 'app.settings.logs.export.modal.instance-logs',
+		defaultMessage: 'Most recent instance log',
+	},
+	crashAnalysis: {
+		id: 'app.settings.logs.export.modal.crash-analysis',
+		defaultMessage: 'Crash analysis (when a crash is detected)',
+	},
+	cancel: { id: 'app.settings.logs.export.modal.cancel', defaultMessage: 'Cancel' },
+	confirm: { id: 'app.settings.logs.export.modal.confirm', defaultMessage: 'Export' },
+	exportedTitle: {
+		id: 'app.settings.logs.export.notification-title',
+		defaultMessage: 'Logs exported',
+	},
+	exportedText: {
+		id: 'app.settings.logs.export.notification-text',
+		defaultMessage: 'The log archive was saved to {path}',
+	},
+})
+
+const rangeOptions = computed(() => [
+	{ value: 'last30Minutes', label: formatMessage(messages.rangeLast30Minutes) },
+	{ value: 'last2Hours', label: formatMessage(messages.rangeLast2Hours) },
+	{ value: 'all', label: formatMessage(messages.rangeAll) },
+])
+
+const levelOptions = computed(() => [
+	{ value: 'all', label: formatMessage(messages.levelAll) },
+	{ value: 'debug', label: formatMessage(messages.levelDebug) },
+	{ value: 'info', label: formatMessage(messages.levelInfo) },
+])
+
+async function exportLogs() {
+	exporting.value = true
+	try {
+		const path = await exportLauncherLogs({
+			range: selectedRange.value,
+			level: selectedLevel.value,
+			includeSystemInfo: includeSystemInfo.value,
+			includeInstanceLogs: includeInstanceLogs.value,
+			includeCrashAnalysis: includeCrashAnalysis.value,
+		})
+
+		if (path) {
+			modal.value?.hide()
+			popupNotificationManager.addPopupNotification({
+				title: formatMessage(messages.exportedTitle),
+				text: formatMessage(messages.exportedText, { path }),
+				type: 'success',
+				buttons: [
+					{
+						label: formatMessage(commonMessages.openInFolderButton),
+						icon: FolderOpenIcon,
+						action: () => highlightInFolder(path).catch(handleError),
+					},
+				],
+			})
+		}
+	} catch (error) {
+		handleError(error)
+	} finally {
+		exporting.value = false
+	}
+}
+
+defineExpose({
+	show: () => modal.value?.show(),
+	hide: () => modal.value?.hide(),
+})
+</script>
+
+<template>
+	<NewModal
+		ref="modal"
+		:header="formatMessage(messages.title)"
+		:closable="true"
+		:close-on-click-outside="true"
+		width="40rem"
+		scrollable
+	>
+		<div class="flex flex-col gap-4">
+			<p class="m-0">{{ formatMessage(messages.description) }}</p>
+
+			<div class="flex flex-col gap-2">
+				<span class="font-semibold text-[var(--color-text-primary)]">{{
+					formatMessage(messages.rangeLabel)
+				}}</span>
+				<Combobox
+					id="log-export-range"
+					v-model="selectedRange"
+					:name="formatMessage(messages.rangeLabel)"
+					:options="rangeOptions"
+				/>
+			</div>
+
+			<div class="flex flex-col gap-2">
+				<span class="font-semibold text-[var(--color-text-primary)]">{{
+					formatMessage(messages.levelLabel)
+				}}</span>
+				<Combobox
+					id="log-export-level"
+					v-model="selectedLevel"
+					:name="formatMessage(messages.levelLabel)"
+					:options="levelOptions"
+				/>
+			</div>
+
+			<div class="flex flex-col gap-2">
+				<span class="font-semibold text-[var(--color-text-primary)]">{{
+					formatMessage(messages.extrasLabel)
+				}}</span>
+				<Checkbox v-model="includeSystemInfo" :label="formatMessage(messages.systemInfo)" />
+				<Checkbox v-model="includeInstanceLogs" :label="formatMessage(messages.instanceLogs)" />
+				<Checkbox v-model="includeCrashAnalysis" :label="formatMessage(messages.crashAnalysis)" />
+			</div>
+		</div>
+
+		<template #actions>
+			<div class="flex justify-end gap-2">
+				<Button type="outlined" :disabled="exporting" @click="modal?.hide()"
+					><XIcon />
+					{{ formatMessage(messages.cancel) }}
+				</Button>
+				<Button type="colored" color="brand" :disabled="exporting" @click="exportLogs"
+					><DownloadIcon />
+					{{ formatMessage(messages.confirm) }}
+				</Button>
+			</div>
+		</template>
+	</NewModal>
+</template>

apps/app-frontend/src/components/ui/settings/LogsSettings.vue

@@ -0,0 +1,66 @@
+<script setup lang="ts">
+import { FolderOpenIcon, UploadIcon } from '@modrinth/assets'
+import { Button, defineMessages, injectNotificationManager, useVIntl } from '@modrinth/ui'
+import { ref } from 'vue'
+
+import { showLauncherLogsFolder } from '@/helpers/utils'
+
+import LogExportModal from './LogExportModal.vue'
+import SettingsRow from './SettingsRow.vue'
+import SettingsSection from './SettingsSection.vue'
+
+const { formatMessage } = useVIntl()
+const { handleError } = injectNotificationManager()
+
+const exportModal = ref<InstanceType<typeof LogExportModal>>()
+
+const messages = defineMessages({
+	exportTitle: { id: 'app.settings.logs.export.title', defaultMessage: 'Export logs' },
+	exportDescription: {
+		id: 'app.settings.logs.export.description',
+		defaultMessage:
+			'Package launcher logs with an optional environment summary, instance log, and crash analysis.',
+	},
+	exportButton: { id: 'app.settings.logs.export.button', defaultMessage: 'Export logs…' },
+	openFolder: { id: 'app.settings.logs.open-folder', defaultMessage: 'Open logs folder' },
+})
+
+async function openLogsFolder() {
+	try {
+		await showLauncherLogsFolder()
+	} catch (error) {
+		handleError(error)
+	}
+}
+</script>
+
+<template>
+	<div class="flex flex-col gap-6">
+		<SettingsSection
+			:title="formatMessage(messages.exportTitle)"
+			:description="formatMessage(messages.exportDescription)"
+			title-id="settings-target-logs-export"
+		>
+			<SettingsRow stacked>
+				<template #label>
+					<span>{{ formatMessage(messages.exportTitle) }}</span>
+				</template>
+				<template #description>{{ formatMessage(messages.exportDescription) }}</template>
+				<template #control>
+					<div class="flex flex-wrap gap-2">
+						<Button type="colored" color="brand" @click="exportModal?.show()"
+							><UploadIcon />
+							{{ formatMessage(messages.exportButton) }}
+						</Button>
+						<Button @click="openLogsFolder"
+							><FolderOpenIcon />
+							{{ formatMessage(messages.openFolder) }}
+						</Button>
+					</div>
+				</template>
+			</SettingsRow>
+		</SettingsSection>
+
+		<LogExportModal ref="exportModal" />
+	</div>
+</template>

apps/app-frontend/src/components/ui/settings/settings-category-definitions.ts

@@ -13,6 +13,7 @@ export type SettingsCategoryId =
 	| 'updates'
 	| 'about'
 	| 'feature-flags'
+	| 'logs'
 
 export type SettingsGroupId = 'launcher' | 'game' | 'data-privacy' | 'support' | 'developer'
 
@@ -116,6 +117,11 @@ export const settingsCategoryDefinitions: SettingsCategoryDefinition[] = [
 		name: { id: 'app.settings.tabs.about', defaultMessage: 'About' },
 		group: 'support',
 	},
+	{
+		id: 'logs',
+		name: { id: 'app.settings.tabs.logs', defaultMessage: 'Logs' },
+		group: 'support',
+	},
 	{
 		id: 'feature-flags',
 		name: {

apps/app-frontend/src/components/ui/settings/settings-registry.ts

@@ -3,6 +3,7 @@ import {
 	BotIcon,
 	CoffeeIcon,
 	CpuIcon,
+	FileTextIcon,
 	GameIcon,
 	GaugeIcon,
 	InfoIcon,
@@ -78,6 +79,10 @@ const categoryContent: Record<SettingsCategoryId, Pick<SettingsCategory, 'icon'
 		content: defineAsyncComponent(() => import('./UpdateSettings.vue')),
 	},
 	about: { icon: InfoIcon, content: defineAsyncComponent(() => import('./AboutSettings.vue')) },
+	logs: {
+		icon: FileTextIcon,
+		content: defineAsyncComponent(() => import('./LogsSettings.vue')),
+	},
 	'feature-flags': {
 		icon: ToggleRightIcon,
 		content: defineAsyncComponent(() => import('./FeatureFlagSettings.vue')),

apps/app-frontend/src/components/ui/settings/settings-search-index.ts

@@ -384,6 +384,16 @@ export const settingsSearchEntries: SettingsSearchEntry[] = [
 		categoryId: 'feature-flags',
 		label: message('settings.feature-flags.title', 'Feature flags'),
 	},
+	{
+		id: 'logs-export',
+		categoryId: 'logs',
+		targetId: 'settings-target-logs-export',
+		label: message('app.settings.logs.export.title', 'Export logs'),
+		description: message(
+			'app.settings.logs.export.description',
+			'Package launcher logs with an optional environment summary, instance log, and crash analysis.',
+		),
+	},
 ]
 
 export function validateSettingsSearchEntries(entries = settingsSearchEntries): string[] {

apps/app-frontend/src/composables/useGridGrouping.ts

@@ -7,15 +7,22 @@ export const UNGROUPED_GROUP_KEY = '__ungrouped__'
 
 export type GridGroupingOption = 'Group' | 'Loader' | 'Game version' | 'None'
 export type GridSortOption =
-	| 'Name'
-	| 'Last played'
-	| 'Date created'
-	| 'Date modified'
-	| 'Game version'
+	'Name' | 'Last played' | 'Date created' | 'Date modified' | 'Game version'
+
+export type GridSortDirection = 'asc' | 'desc'
+
+export const defaultSortDirections: Record<GridSortOption, GridSortDirection> = {
+	Name: 'asc',
+	'Last played': 'desc',
+	'Date created': 'desc',
+	'Date modified': 'desc',
+	'Game version': 'asc',
+}
 
 export interface GridDisplayState {
 	group: GridGroupingOption
 	sortBy: GridSortOption
+	sortDirections: Partial<Record<GridSortOption, GridSortDirection>>
 	collapsedGroups: string[]
 }
 
@@ -38,6 +45,7 @@ export function useGridGrouping<T extends Record<string, unknown>>(
 		{
 			group: 'Group',
 			sortBy: 'Name',
+			sortDirections: {},
 			collapsedGroups: [],
 		},
 		localStorage,
@@ -66,7 +74,7 @@ export function useGridGrouping<T extends Record<string, unknown>>(
 		state.value.collapsedGroups = [...collapsedSections]
 	}
 
-	function sortInstances(instances: T[], sortBy: GridSortOption): T[] {
+	function sortInstances(instances: T[], sortBy: GridSortOption, ascending: boolean): T[] {
 		const sorted = [...instances]
 		const getGameVersion = options.getGameVersion ?? ((i: T) => i.game_version ?? '')
 		const getLastPlayed = options.getLastPlayed ?? ((i: T) => i.last_played ?? 0)
@@ -83,16 +91,19 @@ export function useGridGrouping<T extends Record<string, unknown>>(
 				)
 				break
 			case 'Last played':
-				sorted.sort((a, b) => dayjs(getLastPlayed(b)).diff(dayjs(getLastPlayed(a))))
+				sorted.sort((a, b) => dayjs(getLastPlayed(a)).diff(dayjs(getLastPlayed(b))))
 				break
 			case 'Date created':
-				sorted.sort((a, b) => dayjs(getDateCreated(b)).diff(dayjs(getDateCreated(a))))
+				sorted.sort((a, b) => dayjs(getDateCreated(a)).diff(dayjs(getDateCreated(b))))
 				break
 			case 'Date modified':
-				sorted.sort((a, b) => dayjs(getDateModified(b)).diff(dayjs(getDateModified(a))))
+				sorted.sort((a, b) => dayjs(getDateModified(a)).diff(dayjs(getDateModified(b))))
 				break
 		}
 
+		if (!ascending) {
+			sorted.reverse()
+		}
 		return sorted
 	}
 
@@ -148,11 +159,25 @@ export function useGridGrouping<T extends Record<string, unknown>>(
 	function sortSections(
 		instanceMap: Map<string, T[]>,
 		group: GridGroupingOption,
+		sortBy: GridSortOption,
 	): Map<string, T[]> {
 		if (group !== 'Group' && group !== 'Game version') {
 			return instanceMap
 		}
 
+		if (group === 'Group' && sortBy !== 'Name') {
+			if (instanceMap.has(UNGROUPED_GROUP_KEY) && instanceMap.size > 1) {
+				const ungroupedInstances = instanceMap.get(UNGROUPED_GROUP_KEY)!
+				instanceMap.delete(UNGROUPED_GROUP_KEY)
+				const newMap = new Map<string, T[]>([[UNGROUPED_GROUP_KEY, ungroupedInstances]])
+				for (const [key, instances] of instanceMap) {
+					newMap.set(key, instances)
+				}
+				return newMap
+			}
+			return instanceMap
+		}
+
 		const sortedEntries = [...instanceMap.entries()].sort((a, b) => {
 			if (group === 'Group') {
 				if (a[0] === UNGROUPED_GROUP_KEY && b[0] !== UNGROUPED_GROUP_KEY) return -1
@@ -166,12 +191,30 @@ export function useGridGrouping<T extends Record<string, unknown>>(
 		return instanceMap
 	}
 
+	const sortDirection = computed<GridSortDirection>(() => {
+		return (
+			state.value.sortDirections[state.value.sortBy] ?? defaultSortDirections[state.value.sortBy]
+		)
+	})
+
+	const isSortAscending = computed(() => sortDirection.value === 'asc')
+
+	const toggleSortDirection = () => {
+		const current = sortDirection.value
+		const next: GridSortDirection = current === 'asc' ? 'desc' : 'asc'
+		state.value.sortDirections = {
+			...state.value.sortDirections,
+			[state.value.sortBy]: next,
+		}
+	}
+
 	const filteredResults = computed(() => {
 		const { group = 'Group', sortBy = 'Name' } = state.value
+		const ascending = isSortAscending.value
 
-		const sorted = sortInstances(instances.value, sortBy)
+		const sorted = sortInstances(instances.value, sortBy, ascending)
 		const grouped = groupInstances(sorted, group)
-		return sortSections(grouped, group)
+		return sortSections(grouped, group, sortBy)
 	})
 
 	return {
@@ -180,6 +223,9 @@ export function useGridGrouping<T extends Record<string, unknown>>(
 		filteredResults,
 		isSectionCollapsed,
 		setSectionCollapsed,
+		sortDirection,
+		isSortAscending,
+		toggleSortDirection,
 		UNGROUPED_GROUP_KEY,
 	}
-}
+}

apps/app-frontend/src/composables/useInstanceGroups.ts

@@ -0,0 +1,182 @@
+import { computed, type Ref, ref, watch } from 'vue'
+
+import { instance_groups_listener } from '@/helpers/events'
+import {
+	create_group,
+	delete_group,
+	type InstanceGroupDefinition,
+	type InstanceGroupMembershipUpdate,
+	list_groups,
+	MAX_INSTANCE_GROUP_NAME_LENGTH,
+	rename_group,
+	set_group_memberships,
+	set_group_order,
+} from '@/helpers/instance-groups'
+
+export const FAVORITES_GROUP_ID = 'group:favorites'
+
+export const UNGROUPED_GROUP_ID = 'group:none'
+
+export { MAX_INSTANCE_GROUP_NAME_LENGTH }
+
+export { type InstanceGroupDefinition, type InstanceGroupMembershipUpdate }
+
+export interface InstanceGroupWithMembership {
+	key: string
+	name: string
+	instances: string[]
+}
+
+export function useInstanceGroups(instances: Ref<{ id: string; groups: string[] }[]>) {
+	const libraryGroups = ref<InstanceGroupDefinition[]>([])
+	const libraryGroupsLoaded = ref(false)
+
+	async function fetchGroups() {
+		libraryGroups.value = await list_groups()
+		libraryGroupsLoaded.value = true
+	}
+
+	fetchGroups()
+
+	instance_groups_listener(() => {
+		fetchGroups()
+	})
+
+	const orderedLibraryGroupIds = ref<string[]>([])
+
+	watch(
+		libraryGroups,
+		(groups) => {
+			orderedLibraryGroupIds.value = groups.map((g) => g.id)
+		},
+		{ immediate: true },
+	)
+
+	const instanceGroups = computed(() => {
+		if (!libraryGroupsLoaded.value) {
+			return []
+		}
+
+		const instanceGroupMap = new Map<string, string[]>()
+
+		for (const instance of instances.value) {
+			const groups = instance.groups ?? []
+			for (const groupId of groups) {
+				if (!instanceGroupMap.has(groupId)) {
+					instanceGroupMap.set(groupId, [])
+				}
+				instanceGroupMap.get(groupId)!.push(instance.id)
+			}
+		}
+
+		const allGroupIds = new Set<string>()
+		const groupMap = new Map<string, string[]>()
+
+		for (const groupId of orderedLibraryGroupIds.value) {
+			allGroupIds.add(groupId)
+			groupMap.set(groupId, instanceGroupMap.get(groupId) ?? [])
+		}
+
+		const ungroupedIds: string[] = []
+		for (const instance of instances.value) {
+			const instanceGroups = instance.groups ?? []
+			const isInAnyGroup = instanceGroups.some((g) => allGroupIds.has(g))
+			if (!isInAnyGroup) {
+				ungroupedIds.push(instance.id)
+			}
+		}
+
+		if (ungroupedIds.length > 0) {
+			groupMap.set(UNGROUPED_GROUP_ID, ungroupedIds)
+		}
+
+		return [...groupMap.entries()].map(([key, instances]) => ({
+			key,
+			name:
+				key === UNGROUPED_GROUP_ID
+					? 'Ungrouped'
+					: (libraryGroups.value.find((g) => g.id === key)?.name ?? key),
+			instances,
+		}))
+	})
+
+	const creatingGroup = ref(false)
+	const reorderingGroups = ref(false)
+
+	async function createNewGroup(name: string): Promise<string | null> {
+		creatingGroup.value = true
+		try {
+			const group = await create_group(name)
+			libraryGroups.value = [...libraryGroups.value, group]
+			orderedLibraryGroupIds.value = [...orderedLibraryGroupIds.value, group.id]
+			return group.id
+		} finally {
+			creatingGroup.value = false
+		}
+	}
+
+	async function renameGroupById(id: string, newName: string): Promise<boolean> {
+		if (id === FAVORITES_GROUP_ID) return false
+		const result = await rename_group(id, newName)
+		const idx = libraryGroups.value.findIndex((g) => g.id === id)
+		if (idx !== -1) {
+			libraryGroups.value = [
+				...libraryGroups.value.slice(0, idx),
+				result,
+				...libraryGroups.value.slice(idx + 1),
+			]
+		}
+		return true
+	}
+
+	async function deleteGroupById(id: string): Promise<boolean> {
+		if (id === FAVORITES_GROUP_ID) return false
+		await delete_group(id)
+		libraryGroups.value = libraryGroups.value.filter((g) => g.id !== id)
+		orderedLibraryGroupIds.value = orderedLibraryGroupIds.value.filter((gid) => gid !== id)
+		return true
+	}
+
+	async function reorderGroups(groupIds: string[]): Promise<boolean> {
+		reorderingGroups.value = true
+		try {
+			await set_group_order(groupIds)
+			// Favorites is rendered separately from draggable sections. Keep it in
+			// the local order after a drag even though the backend accepts only the
+			// reorderable group ids; otherwise it appears again as an ordinary
+			// section until the next full group refresh.
+			orderedLibraryGroupIds.value = [
+				FAVORITES_GROUP_ID,
+				...groupIds.filter((id) => id !== FAVORITES_GROUP_ID),
+			]
+			return true
+		} finally {
+			reorderingGroups.value = false
+		}
+	}
+
+	async function setMemberships(updates: InstanceGroupMembershipUpdate[]): Promise<boolean> {
+		await set_group_memberships(updates)
+		return true
+	}
+
+	function groupNameById(id: string): string | undefined {
+		if (id === UNGROUPED_GROUP_ID) return 'Ungrouped'
+		return libraryGroups.value.find((g) => g.id === id)?.name
+	}
+
+	return {
+		libraryGroups,
+		libraryGroupsLoaded,
+		orderedLibraryGroupIds,
+		instanceGroups,
+		creatingGroup,
+		reorderingGroups,
+		createGroup: createNewGroup,
+		renameGroupById,
+		deleteGroupById,
+		reorderGroups,
+		setMemberships,
+		groupNameById,
+	}
+}

apps/app-frontend/src/helpers/analytics.ts

@@ -0,0 +1,75 @@
+interface InstanceProperties {
+	loader: string
+	game_version: string
+}
+
+interface ProjectProperties extends InstanceProperties {
+	id: string
+	project_type: string
+}
+
+type AnalyticsEventMap = {
+	Launched: { version: string; dev: boolean; onboarded: boolean }
+	PageView: { path: string; fromPath: string; failed: unknown }
+	InstanceCreate: { source: string }
+	InstanceCreateStart: { source: string }
+	InstanceStart: InstanceProperties & { source: string }
+	InstanceStop: Partial<InstanceProperties> & { source?: string }
+	InstanceDuplicate: InstanceProperties
+	InstanceRepair: InstanceProperties
+	InstanceSetIcon: Record<string, never>
+	InstanceRemoveIcon: Record<string, never>
+	InstanceUpdateAll: InstanceProperties & { count: number; selected: boolean }
+	InstanceProjectUpdate: InstanceProperties & { id: string; name: string; project_type: string }
+	InstanceProjectDisable: InstanceProperties & {
+		id: string
+		name: string
+		project_type: string
+		disabled: boolean
+	}
+	InstanceProjectRemove: InstanceProperties & { id: string; name: string; project_type: string }
+	ProjectInstall: ProjectProperties & { version_id: string; title: string; source: string }
+	ProjectInstallStart: { source: string }
+	PackInstall: { id: string; version_id: string; title: string; source: string }
+	PackInstallStart: Record<string, never>
+	AccountLogIn: { source?: string }
+	AccountLogOut: Record<string, never>
+	JavaTest: { path: string; success: boolean }
+	JavaManualSelect: { version: string }
+	JavaAutoDetect: { path: string; version: string }
+	GalleryImageNext: { project_id: string; url: string }
+	GalleryImagePrevious: { project_id: string; url: unknown }
+	GalleryImageExpand: { project_id: string; url: string }
+}
+
+export type AnalyticsEvent = keyof AnalyticsEventMap
+
+let optedIn = false
+let debugEnabled = false
+
+export const initAnalytics = () => {
+	optedIn = true
+}
+
+export const debugAnalytics = () => {
+	debugEnabled = true
+}
+
+export const optOutAnalytics = () => {
+	optedIn = false
+}
+
+export const optInAnalytics = () => {
+	optedIn = true
+}
+
+type OptionalArgs<T> = Record<string, never> extends T ? [properties?: T] : [properties: T]
+
+export const trackEvent = <E extends AnalyticsEvent>(
+	eventName: E,
+	...args: OptionalArgs<AnalyticsEventMap[E]>
+) => {
+	if (optedIn && debugEnabled) {
+		console.debug('[Starlight telemetry disabled]', eventName, args[0])
+	}
+}

apps/app-frontend/src/helpers/events.js

@@ -82,6 +82,16 @@ export async function instance_bulk_update_progress_listener(callback) {
 	return await listen('instance_bulk_update_progress', (event) => callback(event.payload))
 }
 
+/// Payload for the 'instance_groups_changed' event
+/*
+	InstanceGroupsChangedPayload {
+		instance_ids: string[]
+	}
+*/
+export async function instance_groups_listener(callback) {
+	return await listen('instance_groups_changed', (event) => callback(event.payload))
+}
+
 export async function install_job_listener(callback) {
 	return await listen('install_job', (event) => callback(event.payload))
 }

apps/app-frontend/src/helpers/instance-groups.ts

@@ -1 +1,46 @@
-export const MAX_INSTANCE_GROUP_NAME_LENGTH = 256
+import { invoke } from '@tauri-apps/api/core'
+
+export const MAX_INSTANCE_GROUP_NAME_LENGTH = 256
+
+export type InstanceGroupDefinition = {
+	id: string
+	name: string
+}
+
+export type InstanceGroupMembershipUpdate = {
+	instance_id: string
+	group_ids: string[]
+}
+
+export async function list_groups(): Promise<InstanceGroupDefinition[]> {
+	return await invoke('plugin:instance|instance_list_groups')
+}
+
+export async function create_group(name: string): Promise<InstanceGroupDefinition> {
+	return await invoke('plugin:instance|instance_create_group', { name })
+}
+
+export async function rename_group(id: string, newName: string): Promise<InstanceGroupDefinition> {
+	return await invoke('plugin:instance|instance_rename_group', {
+		id,
+		newName,
+	})
+}
+
+export async function delete_group(id: string): Promise<void> {
+	return await invoke('plugin:instance|instance_delete_group', { id })
+}
+
+export async function set_group_order(group_ids: string[]): Promise<void> {
+	return await invoke('plugin:instance|instance_set_group_order', {
+		groupIds: group_ids,
+	})
+}
+
+export async function set_group_memberships(
+	updates: InstanceGroupMembershipUpdate[],
+): Promise<void> {
+	return await invoke('plugin:instance|instance_set_group_memberships', {
+		updates,
+	})
+}

apps/app-frontend/src/helpers/remote-announcements.test.ts

@@ -0,0 +1,78 @@
+import assert from 'node:assert/strict'
+import test from 'node:test'
+
+import { mapBroadcastAnnouncements } from './remote-announcements.ts'
+
+test('maps a broadcast entry into a remote announcement', () => {
+	const result = mapBroadcastAnnouncements([
+		{
+			id: 1,
+			title: '维护通知',
+			subtitle: '今晚停机',
+			content: '服务器将于今晚维护。',
+			updateAt: 1791640873710,
+			star: true,
+			importantLevel: 9,
+			source: 'SKIN',
+		},
+	])
+	assert.equal(result?.length, 1)
+	const item = result?.[0]
+	assert.equal(item?.id, '1')
+	assert.equal(item?.title, '维护通知')
+	assert.equal(item?.summary, '今晚停机')
+	assert.equal(item?.priority, 'critical')
+	assert.equal(item?.pinned, true)
+	assert.equal(item?.type, 'modal')
+	assert.equal(item?.published_at, new Date(1791640873710).toISOString())
+	assert.equal(item?.ends_at, null)
+})
+
+test('empty or blank subtitle becomes null summary', () => {
+	const result = mapBroadcastAnnouncements([
+		{ id: 2, title: '公告', subtitle: '  ', content: '内容', updateAt: 1000 },
+	])
+	assert.equal(result?.[0]?.summary, null)
+})
+
+test('skips entries missing required fields', () => {
+	const result = mapBroadcastAnnouncements([
+		{ id: 3, title: '有效', content: '内容', updateAt: 1000 },
+		{ id: 4, title: '', content: '内容', updateAt: 1000 },
+		{ title: '无 id', content: '内容', updateAt: 1000 },
+		{ id: 5, title: '无时间', content: '内容' },
+		null,
+		'不是对象',
+	])
+	assert.equal(result?.length, 1)
+	assert.equal(result?.[0]?.id, '3')
+})
+
+test('clamps importantLevel and maps priority boundaries', () => {
+	const result = mapBroadcastAnnouncements([
+		{ id: 6, title: 'a', content: 'x', updateAt: 1000, importantLevel: 0 },
+		{ id: 7, title: 'b', content: 'x', updateAt: 1000, importantLevel: 3 },
+		{ id: 8, title: 'c', content: 'x', updateAt: 1000, importantLevel: 6 },
+		{ id: 9, title: 'd', content: 'x', updateAt: 1000, importantLevel: 999 },
+	])
+	const byId = new Map(result?.map((item) => [item.id, item.priority]))
+	assert.equal(byId.get('6'), 'low')
+	assert.equal(byId.get('7'), 'normal')
+	assert.equal(byId.get('8'), 'high')
+	assert.equal(byId.get('9'), 'critical')
+})
+
+test('returns null for non-array payloads', () => {
+	assert.equal(mapBroadcastAnnouncements(null), null)
+	assert.equal(mapBroadcastAnnouncements({ payload: [] }), null)
+	assert.equal(mapBroadcastAnnouncements('nope'), null)
+})
+
+test('pinned announcements sort first', () => {
+	const result = mapBroadcastAnnouncements([
+		{ id: 10, title: '普通', content: 'x', updateAt: 2000, importantLevel: 9 },
+		{ id: 11, title: '置顶', content: 'x', updateAt: 1000, star: true },
+	])
+	assert.equal(result?.[0]?.id, '11')
+	assert.equal(result?.[1]?.id, '10')
+})

apps/app-frontend/src/helpers/remote-announcements.ts

@@ -5,6 +5,7 @@ export type RemoteAnnouncement = {
 	content: string
 	type: 'modal' | 'notification'
 	priority: 'low' | 'normal' | 'high' | 'critical'
+	pinned?: boolean
 	starts_at: string
 	ends_at: string | null
 	published_at: string
@@ -32,18 +33,28 @@ export function parseAnnouncements(value: unknown): RemoteAnnouncement[] | null
 		if (!entry || typeof entry !== 'object') continue
 		const item = entry as Record<string, unknown>
 		if (
-			typeof item.id !== 'string' || item.id.length > 100 || ids.has(item.id) ||
-			typeof item.title !== 'string' || !item.title.trim() || item.title.length > 120 ||
-			typeof item.content !== 'string' || item.content.length > 20000 ||
+			typeof item.id !== 'string' ||
+			item.id.length > 100 ||
+			ids.has(item.id) ||
+			typeof item.title !== 'string' ||
+			!item.title.trim() ||
+			item.title.length > 120 ||
+			typeof item.content !== 'string' ||
+			item.content.length > 20000 ||
 			(item.summary != null && (typeof item.summary !== 'string' || item.summary.length > 300)) ||
 			!['modal', 'notification'].includes(String(item.type)) ||
 			!['low', 'normal', 'high', 'critical'].includes(String(item.priority)) ||
-			typeof item.starts_at !== 'string' || !Number.isFinite(Date.parse(item.starts_at)) ||
-			typeof item.published_at !== 'string' || !Number.isFinite(Date.parse(item.published_at)) ||
-			(item.ends_at != null && (typeof item.ends_at !== 'string' || !Number.isFinite(Date.parse(item.ends_at)))) ||
-			(item.action_label != null && (typeof item.action_label !== 'string' || item.action_label.length > 80)) ||
+			typeof item.starts_at !== 'string' ||
+			!Number.isFinite(Date.parse(item.starts_at)) ||
+			typeof item.published_at !== 'string' ||
+			!Number.isFinite(Date.parse(item.published_at)) ||
+			(item.ends_at != null &&
+				(typeof item.ends_at !== 'string' || !Number.isFinite(Date.parse(item.ends_at)))) ||
+			(item.action_label != null &&
+				(typeof item.action_label !== 'string' || item.action_label.length > 80)) ||
 			(item.action_url != null && !safeAnnouncementUrl(item.action_url))
-		) continue
+		)
+			continue
 		ids.add(item.id)
 		items.push({
 			...item,
@@ -54,7 +65,12 @@ export function parseAnnouncements(value: unknown): RemoteAnnouncement[] | null
 		} as RemoteAnnouncement)
 	}
 	const rank = { low: 0, normal: 1, high: 2, critical: 3 }
-	return items.sort((first, second) => rank[second.priority] - rank[first.priority] || Date.parse(second.published_at) - Date.parse(first.published_at))
+	return items.sort(
+		(first, second) =>
+			Number(second.pinned ?? false) - Number(first.pinned ?? false) ||
+			rank[second.priority] - rank[first.priority] ||
+			Date.parse(second.published_at) - Date.parse(first.published_at),
+	)
 }
 
 export function isAnnouncementActive(item: RemoteAnnouncement, now = Date.now()) {
@@ -64,3 +80,76 @@ export function isAnnouncementActive(item: RemoteAnnouncement, now = Date.now())
 export function announcementKey(item: RemoteAnnouncement) {
 	return item.id + ':' + item.published_at
 }
+
+export const REMOTE_ANNOUNCEMENTS_UPDATED_EVENT = 'starlight:remote-announcements-updated'
+export const OPEN_REMOTE_ANNOUNCEMENT_CENTER_EVENT = 'starlight:open-remote-announcement-center'
+type BroadcastAnnouncementEntry = {
+	title?: unknown
+	subtitle?: unknown
+	content?: unknown
+	updateAt?: unknown
+	star?: unknown
+	importantLevel?: unknown
+	id?: unknown
+}
+
+function broadcastPriority(level: number): RemoteAnnouncement['priority'] {
+	if (level >= 9) return 'critical'
+	if (level >= 6) return 'high'
+	if (level >= 3) return 'normal'
+	return 'low'
+}
+
+export function mapBroadcastAnnouncements(payload: unknown): RemoteAnnouncement[] | null {
+	if (!Array.isArray(payload) || payload.length > 200) return null
+	const items: RemoteAnnouncement[] = []
+	const seen = new Set<string>()
+	for (const entry of payload) {
+		if (!entry || typeof entry !== 'object') continue
+		const item = entry as BroadcastAnnouncementEntry
+		if (
+			typeof item.id !== 'number' ||
+			!Number.isFinite(item.id) ||
+			typeof item.title !== 'string' ||
+			!item.title.trim() ||
+			item.title.length > 120 ||
+			typeof item.content !== 'string' ||
+			item.content.length > 20000 ||
+			typeof item.updateAt !== 'number' ||
+			!Number.isFinite(item.updateAt) ||
+			(item.subtitle != null && typeof item.subtitle !== 'string')
+		)
+			continue
+		const id = String(item.id)
+		if (seen.has(id)) continue
+		seen.add(id)
+		const level =
+			typeof item.importantLevel === 'number' && Number.isFinite(item.importantLevel)
+				? Math.max(0, Math.min(10, Math.floor(item.importantLevel)))
+				: 0
+		const starred = item.star === true
+		const published = new Date(item.updateAt).toISOString()
+		const summary = typeof item.subtitle === 'string' && item.subtitle.trim() ? item.subtitle : null
+		items.push({
+			id,
+			title: item.title,
+			summary,
+			content: item.content,
+			type: starred || level >= 8 ? 'modal' : 'notification',
+			priority: broadcastPriority(level),
+			pinned: starred,
+			starts_at: published,
+			ends_at: null,
+			published_at: published,
+			action_url: null,
+			action_label: null,
+		})
+	}
+	const rank = { low: 0, normal: 1, high: 2, critical: 3 }
+	return items.sort(
+		(first, second) =>
+			Number(second.pinned ?? false) - Number(first.pinned ?? false) ||
+			rank[second.priority] - rank[first.priority] ||
+			Date.parse(second.published_at) - Date.parse(first.published_at),
+	)
+}

apps/app-frontend/src/helpers/types.d.ts

@@ -55,6 +55,7 @@ export type GameInstance = {
 	force_fullscreen?: boolean
 	maximize_window?: boolean
 	game_resolution?: [number, number]
+	window_title?: string | null
 	launch_preparation_timeout?: number | null
 	hooks: Hooks
 }
@@ -239,6 +240,8 @@ type AppSettings = {
 	force_fullscreen: boolean
 	maximize_window: boolean
 	game_resolution: [number, number]
+	custom_window_title_enabled: boolean
+	default_window_title: string
 	hide_on_process_start: boolean
 	enter_lightweight_mode_on_game_launch: boolean
 	auto_set_java_high_performance_mode: boolean

apps/app-frontend/src/helpers/utils.js

@@ -81,6 +81,38 @@ export async function exportErrorLogs(
 	return await invoke('plugin:utils|export_error_logs', { outputPath, errorMessage })
 }
 
+export async function exportLauncherLogs({
+	range = 'last2Hours',
+	level = 'all',
+	includeSystemInfo = true,
+	includeInstanceLogs = false,
+	includeCrashAnalysis = false,
+	fileNamePrefix = 'Starlight Launcher logs',
+} = {}) {
+	const timestamp = new Date().toISOString().replace(/[:.]/g, '-')
+	const outputPath = await save({
+		defaultPath: `${fileNamePrefix} ${timestamp}.zip`,
+		filters: [
+			{
+				name: 'ZIP archive',
+				extensions: ['zip'],
+			},
+		],
+	})
+
+	if (!outputPath) return null
+
+	await invoke('plugin:utils|export_launcher_logs', {
+		outputPath,
+		range,
+		level,
+		includeSystemInfo,
+		includeInstanceLogs,
+		includeCrashAnalysis,
+	})
+	return outputPath
+}
+
 export async function createInstanceShortcut(instanceName, instanceId, options = {}) {
 	const outputPath = await save({
 		defaultPath: `Modrinth - ${instanceName}`,

apps/app-frontend/src/locales/en-US/index.json

@@ -11431,5 +11431,173 @@
   },
   "app.anniversary.banner": {
     "message": "Happy {ordinal} Anniversary, Starlight!"
-  }
-}
+  },
+  "instance.settings.tabs.window.window-title": {
+    "message": "Window title"
+  },
+  "instance.settings.tabs.window.window-title.description": {
+    "message": "Customize the Minecraft window title. Leave empty to keep the default."
+  },
+  "instance.settings.tabs.window.window-title.enter": {
+    "message": "Enter window title..."
+  },
+  "app.settings.defaults.window-title.enabled": {
+    "message": "Custom Minecraft window title"
+  },
+  "app.settings.defaults.window-title.enabled-description": {
+    "message": "Allow instances to customize the Minecraft window title."
+  },
+  "app.settings.defaults.window-title.default": {
+    "message": "Default window title"
+  },
+  "app.settings.defaults.window-title.default-description": {
+    "message": "Used when an instance does not provide its own title."
+  },
+  "app.settings.defaults.window-title.default-placeholder": {
+    "message": "Enter the default window title..."
+  },
+  "app.action-bar.announcements": {
+    "message": "Announcements"
+  },
+  "app.remote-announcements.center-title": {
+    "message": "Announcements"
+  },
+  "app.remote-announcements.empty": {
+    "message": "No announcements"
+  },
+  "app.remote-announcements.view": {
+    "message": "View announcement"
+  },
+  "app.remote-announcements.unread": {
+    "message": "Unread"
+  },
+  "app.remote-announcements.read-all": {
+    "message": "Mark all announcements as read"
+  },
+  "app.remote-announcements.preview-title": {
+    "message": "Announcement style preview"
+  },
+  "app.remote-announcements.preview-summary": {
+    "message": "This is a local preview notification. Select View announcement to see the full Markdown content."
+  },
+  "app.remote-announcements.preview-content": {
+    "message": "## Announcement preview\n\nThis is **sample content**, not a published announcement.\n\n- Supports headings, lists, and links\n- Close buttons are always available\n\n> Previewing does not change real announcement read status.\n\n| Type | Display |\n| --- | --- |\n| Modal | Full Markdown content |\n| Popup | Summary, then full content |\n\n[Visit the website](https://skin.starlight.cool/)"
+  },
+  "app.remote-announcements.preview-action": {
+    "message": "Visit website"
+  },
+  "app.settings.tabs.logs": {
+    "message": "Logs & diagnostics"
+  },
+  "app.settings.logs.export.title": {
+    "message": "Export logs"
+  },
+  "app.settings.logs.export.description": {
+    "message": "Package launcher logs with an optional environment summary, instance log, and crash analysis."
+  },
+  "app.settings.logs.export.button": {
+    "message": "Export logs…"
+  },
+  "app.settings.logs.open-folder": {
+    "message": "Open logs folder"
+  },
+  "app.settings.logs.export.modal.title": {
+    "message": "Export logs"
+  },
+  "app.settings.logs.export.modal.description": {
+    "message": "Choose how much detail to include. Exported logs have access tokens, Minecraft tokens, and IP addresses replaced with placeholders."
+  },
+  "app.settings.logs.export.modal.range": {
+    "message": "Time range"
+  },
+  "app.settings.logs.export.modal.range.30-minutes": {
+    "message": "Last 30 minutes"
+  },
+  "app.settings.logs.export.modal.range.2-hours": {
+    "message": "Last 2 hours"
+  },
+  "app.settings.logs.export.modal.range.all": {
+    "message": "All sessions"
+  },
+  "app.settings.logs.export.modal.level": {
+    "message": "Log level"
+  },
+  "app.settings.logs.export.modal.level.all": {
+    "message": "All levels"
+  },
+  "app.settings.logs.export.modal.level.debug": {
+    "message": "Debug and above"
+  },
+  "app.settings.logs.export.modal.level.info": {
+    "message": "Info and above"
+  },
+  "app.settings.logs.export.modal.extras": {
+    "message": "Additional information"
+  },
+  "app.settings.logs.export.modal.system-info": {
+    "message": "System and environment summary"
+  },
+  "app.settings.logs.export.modal.instance-logs": {
+    "message": "Most recent instance log"
+  },
+  "app.settings.logs.export.modal.crash-analysis": {
+    "message": "Crash analysis (when a crash is detected)"
+  },
+  "app.settings.logs.export.modal.cancel": {
+    "message": "Cancel"
+  },
+  "app.settings.logs.export.modal.confirm": {
+    "message": "Export"
+  },
+  "app.settings.logs.export.notification-title": {
+    "message": "Logs exported"
+  },
+  "app.settings.logs.export.notification-text": {
+    "message": "The log archive was saved to {path}"
+  },
+  "app.skins.armor.title": {"message": "Armour and trims"},
+  "app.skins.armor.save": {"message": "Save"},
+  "app.skins.armor.close": {"message": "Close"},
+  "app.skins.armor.description": {"message": "Try armour and trims on your skin. Nothing is stored until you save it."},
+  "app.skins.armor.unsaved": {"message": "Unsaved changes"},
+  "app.skins.armor.reset-to-saved": {"message": "Reset to saved"},
+  "app.skins.armor.restore-defaults": {"message": "Restore defaults"},
+  "app.instances.batch-edit-groups.add": {"message": "Add"},
+  "app.instances.batch-edit-groups.add-to-group-title": {"message": "Add instances to \"{groupName}\""},
+  "app.instances.batch-edit-groups.added": {"message": "Added"},
+  "app.instances.batch-edit-groups.cancel": {"message": "Cancel"},
+  "app.instances.batch-edit-groups.create": {"message": "Create group"},
+  "app.instances.batch-edit-groups.group-name": {"message": "Group name"},
+  "app.instances.batch-edit-groups.group-name-placeholder": {"message": "Enter group name"},
+  "app.instances.batch-edit-groups.no-instances-found": {"message": "No instances found"},
+  "app.instances.batch-edit-groups.save-changes": {"message": "Save"},
+  "app.instances.batch-edit-groups.search-instance": {"message": "Search instances"},
+  "app.instances.group.add-to-group": {"message": "Add to group"},
+  "app.instances.group.collapse": {"message": "Collapse group"},
+  "app.instances.group.delete-description": {"message": "Instances in this group will be ungrouped."},
+  "app.instances.group.delete-group": {"message": "Delete group"},
+  "app.instances.group.edit-name": {"message": "Edit group name"},
+  "app.instances.group.empty": {"message": "Drag and drop to add instances."},
+  "app.instances.group.expand": {"message": "Expand group"},
+  "app.instances.group.move-down": {"message": "Move group down"},
+  "app.instances.group.move-up": {"message": "Move group up"},
+  "app.instances.group.name-empty": {"message": "Group names cannot be empty."},
+  "app.instances.group.name-too-long": {"message": "Group names cannot be longer than {maxLength} characters."},
+  "app.instances.group.new-instance": {"message": "New instance"},
+  "app.instances.group.pinned": {"message": "Pinned"},
+  "app.instances.group.rename-group": {"message": "Rename group"},
+  "app.instances.sort-by": {"message": "Sort by"},
+  "app.instances.sort.direction.asc-alphabetical": {"message": "A–Z"},
+  "app.instances.sort.direction.asc-date": {"message": "Oldest first"},
+  "app.instances.sort.direction.asc-recency": {"message": "Least recent first"},
+  "app.instances.sort.direction.asc-version": {"message": "Oldest version first"},
+  "app.instances.sort.direction.desc-alphabetical": {"message": "Z–A"},
+  "app.instances.sort.direction.desc-date": {"message": "Newest first"},
+  "app.instances.sort.direction.desc-recency": {"message": "Most recent first"},
+  "app.instances.sort.direction.desc-version": {"message": "Newest version first"},
+  "app.library.context-menu.pin-instance": {"message": "Pin instance"},
+  "app.library.context-menu.remove-from-group": {"message": "Remove from group"},
+  "app.library.context-menu.unpin-instance": {"message": "Unpin instance"},
+  "app.library.group.new": {"message": "New group"},
+  "app.library.selection.new-group": {"message": "New group"},
+  "app.library.selection.remove-from-group": {"message": "Remove from group"}}

apps/app-frontend/src/locales/zh-CN/index.json

@@ -11351,5 +11351,84 @@
 	"app.settings.synced-options.game-settings.value-off": { "message": "关闭" },
 	"app.settings.synced-options.game-settings.value-on": { "message": "开启" },
 	"app.settings.synced-options.game-settings.value-unset": { "message": "选择一个值" },
-	"app.anniversary.banner": { "message": "Starlight {ordinal} 周年快乐！" }
-}
+	"app.anniversary.banner": { "message": "Starlight {ordinal} 周年快乐！" },
+	"instance.settings.tabs.window.window-title": { "message": "窗口标题" },
+	"instance.settings.tabs.window.window-title.description": { "message": "自定义 Minecraft 窗口标题。留空则使用默认标题。" },
+	"instance.settings.tabs.window.window-title.enter": { "message": "输入窗口标题..." },
+	"app.settings.defaults.window-title.enabled": { "message": "自定义 Minecraft 窗口标题" },
+	"app.settings.defaults.window-title.enabled-description": { "message": "允许实例自定义 Minecraft 窗口标题。" },
+	"app.settings.defaults.window-title.default": { "message": "默认窗口标题" },
+	"app.settings.defaults.window-title.default-description": { "message": "当实例未提供自己的标题时使用。" },
+	"app.settings.defaults.window-title.default-placeholder": { "message": "输入默认窗口标题..." },
+	"app.action-bar.announcements": { "message": "公告" },
+	"app.remote-announcements.center-title": { "message": "公告" },
+	"app.remote-announcements.empty": { "message": "暂无公告" },
+	"app.settings.tabs.logs": { "message": "日志与诊断" },
+	"app.settings.logs.export.title": { "message": "导出日志" },
+	"app.settings.logs.export.description": { "message": "将启动器日志打包，可附带环境摘要、最近的实例日志与崩溃分析。" },
+	"app.settings.logs.export.button": { "message": "导出日志…" },
+	"app.settings.logs.open-folder": { "message": "打开日志文件夹" },
+	"app.settings.logs.export.modal.title": { "message": "导出日志" },
+	"app.settings.logs.export.modal.description": { "message": "选择要包含的详细程度。导出的日志会把访问令牌、Minecraft 令牌与 IP 地址替换为占位符。" },
+	"app.settings.logs.export.modal.range": { "message": "时间范围" },
+	"app.settings.logs.export.modal.range.30-minutes": { "message": "最近 30 分钟" },
+	"app.settings.logs.export.modal.range.2-hours": { "message": "最近 2 小时" },
+	"app.settings.logs.export.modal.range.all": { "message": "全部会话" },
+	"app.settings.logs.export.modal.level": { "message": "日志等级" },
+	"app.settings.logs.export.modal.level.all": { "message": "全部等级" },
+	"app.settings.logs.export.modal.level.debug": { "message": "DEBUG 及以上" },
+	"app.settings.logs.export.modal.level.info": { "message": "INFO 及以上" },
+	"app.settings.logs.export.modal.extras": { "message": "附加信息" },
+	"app.settings.logs.export.modal.system-info": { "message": "系统与环境摘要" },
+	"app.settings.logs.export.modal.instance-logs": { "message": "最近的实例日志" },
+	"app.settings.logs.export.modal.crash-analysis": { "message": "崩溃分析（检测到崩溃时）" },
+	"app.settings.logs.export.modal.cancel": { "message": "取消" },
+	"app.settings.logs.export.modal.confirm": { "message": "导出" },
+	"app.settings.logs.export.notification-title": { "message": "日志已导出" },
+	"app.settings.logs.export.notification-text": { "message": "日志压缩包已保存到 {path}" },
+  "app.skins.armor.title": {"message": "盔甲与纹饰"},
+  "app.skins.armor.save": {"message": "保存"},
+  "app.skins.armor.close": {"message": "关闭"},
+  "app.skins.armor.description": {"message": "在皮肤上试穿盔甲与纹饰。未保存前不会写入任何内容。"},
+  "app.skins.armor.unsaved": {"message": "有未保存的更改"},
+  "app.skins.armor.reset-to-saved": {"message": "重置为已保存"},
+  "app.skins.armor.restore-defaults": {"message": "恢复默认"},
+  "app.instances.batch-edit-groups.add": {"message": "添加"},
+  "app.instances.batch-edit-groups.add-to-group-title": {"message": "添加实例到「{groupName}」"},
+  "app.instances.batch-edit-groups.added": {"message": "已添加"},
+  "app.instances.batch-edit-groups.cancel": {"message": "取消"},
+  "app.instances.batch-edit-groups.create": {"message": "创建分组"},
+  "app.instances.batch-edit-groups.group-name": {"message": "分组名称"},
+  "app.instances.batch-edit-groups.group-name-placeholder": {"message": "输入分组名称"},
+  "app.instances.batch-edit-groups.no-instances-found": {"message": "未找到实例"},
+  "app.instances.batch-edit-groups.save-changes": {"message": "保存"},
+  "app.instances.batch-edit-groups.search-instance": {"message": "搜索实例"},
+  "app.instances.group.add-to-group": {"message": "添加到分组"},
+  "app.instances.group.collapse": {"message": "折叠分组"},
+  "app.instances.group.delete-description": {"message": "此分组中的实例将被取消分组。"},
+  "app.instances.group.delete-group": {"message": "删除分组"},
+  "app.instances.group.edit-name": {"message": "编辑分组名称"},
+  "app.instances.group.empty": {"message": "拖放实例到此处添加。"},
+  "app.instances.group.expand": {"message": "展开分组"},
+  "app.instances.group.move-down": {"message": "下移分组"},
+  "app.instances.group.move-up": {"message": "上移分组"},
+  "app.instances.group.name-empty": {"message": "分组名称不能为空。"},
+  "app.instances.group.name-too-long": {"message": "分组名称不能超过 {maxLength} 个字符。"},
+  "app.instances.group.new-instance": {"message": "新建实例"},
+  "app.instances.group.pinned": {"message": "已置顶"},
+  "app.instances.group.rename-group": {"message": "重命名分组"},
+  "app.instances.sort-by": {"message": "排序方式"},
+  "app.instances.sort.direction.asc-alphabetical": {"message": "A–Z 正序"},
+  "app.instances.sort.direction.asc-date": {"message": "最早的在前"},
+  "app.instances.sort.direction.asc-recency": {"message": "最早游玩在前"},
+  "app.instances.sort.direction.asc-version": {"message": "旧版本在前"},
+  "app.instances.sort.direction.desc-alphabetical": {"message": "Z–A 倒序"},
+  "app.instances.sort.direction.desc-date": {"message": "最新的在前"},
+  "app.instances.sort.direction.desc-recency": {"message": "最近游玩在前"},
+  "app.instances.sort.direction.desc-version": {"message": "新版本在前"},
+  "app.library.context-menu.pin-instance": {"message": "置顶实例"},
+  "app.library.context-menu.remove-from-group": {"message": "移出分组"},
+  "app.library.context-menu.unpin-instance": {"message": "取消置顶"},
+  "app.library.group.new": {"message": "新建分组"},
+  "app.library.selection.new-group": {"message": "新建分组"},
+  "app.library.selection.remove-from-group": {"message": "移出分组"}}

apps/app/build.rs

@@ -534,6 +534,12 @@ fn main() {
                         "instance_delete_screenshot_group",
                         "instance_set_screenshot_group_memberships",
                         "instance_import_screenshot_groups",
+                        "instance_list_groups",
+                        "instance_create_group",
+                        "instance_rename_group",
+                        "instance_delete_group",
+                        "instance_set_group_order",
+                        "instance_set_group_memberships",
                         "instance_delete_screenshots",
                         "instance_export_screenshots",
                         "instance_move_screenshots",
@@ -694,6 +700,7 @@ fn main() {
                         "open_path",
                         "show_launcher_logs_folder",
                         "export_error_logs",
+                        "export_launcher_logs",
                         "show_app_db_backups_folder",
                         "progress_bars_list",
                         "get_opening_command",

apps/app/src/api/instance/mod.rs

@@ -131,6 +131,12 @@ pub fn init<R: tauri::Runtime>() -> tauri::plugin::TauriPlugin<R> {
             instance_delete_screenshot_group,
             instance_set_screenshot_group_memberships,
             instance_import_screenshot_groups,
+            instance_list_groups,
+            instance_create_group,
+            instance_rename_group,
+            instance_delete_group,
+            instance_set_group_order,
+            instance_set_group_memberships,
             instance_delete_screenshots,
             instance_export_screenshots,
             instance_move_screenshots,
@@ -333,6 +339,12 @@ pub struct EditInstance {
     )]
     pub launch_preparation_timeout: Option<Option<u64>>,
     pub hooks: Option<Hooks>,
+    #[serde(
+        default,
+        skip_serializing_if = "Option::is_none",
+        with = "serde_with::rust::double_option"
+    )]
+    pub window_title: Option<Option<String>>,
 
     #[serde(
         default,
@@ -531,7 +543,8 @@ fn edit_to_core(edit_instance: EditInstance) -> Result<CoreEditInstance> {
                 || edit_instance.maximize_window.is_some()
                 || edit_instance.game_resolution.is_some()
                 || edit_instance.launch_preparation_timeout.is_some()
-                || edit_instance.hooks.is_some();
+                || edit_instance.hooks.is_some()
+                || edit_instance.window_title.is_some();
             if has_launch_change {
                 Some(InstanceLaunchOverridesPatch {
                     player: None,
@@ -546,6 +559,7 @@ fn edit_to_core(edit_instance: EditInstance) -> Result<CoreEditInstance> {
                     launch_preparation_timeout: edit_instance
                         .launch_preparation_timeout,
                     hooks: edit_instance.hooks,
+                    window_title: edit_instance.window_title,
                 })
             } else {
                 None
@@ -1709,6 +1723,44 @@ pub async fn instance_import_screenshot_groups(
     Ok(theseus::instance::import_screenshot_groups(groups).await?)
 }
 
+#[tauri::command]
+pub async fn instance_list_groups()
+-> Result<Vec<theseus::instance::InstanceGroup>> {
+    Ok(theseus::instance::list_groups().await?)
+}
+
+#[tauri::command]
+pub async fn instance_create_group(
+    name: String,
+) -> Result<theseus::instance::InstanceGroup> {
+    Ok(theseus::instance::create_group(name).await?)
+}
+
+#[tauri::command]
+pub async fn instance_rename_group(
+    id: String,
+    new_name: String,
+) -> Result<theseus::instance::InstanceGroup> {
+    Ok(theseus::instance::rename_group(id, new_name).await?)
+}
+
+#[tauri::command]
+pub async fn instance_delete_group(id: String) -> Result<()> {
+    Ok(theseus::instance::delete_group(id).await?)
+}
+
+#[tauri::command]
+pub async fn instance_set_group_order(group_ids: Vec<String>) -> Result<()> {
+    Ok(theseus::instance::set_group_order(group_ids).await?)
+}
+
+#[tauri::command]
+pub async fn instance_set_group_memberships(
+    updates: Vec<theseus::instance::InstanceGroupMembershipUpdate>,
+) -> Result<()> {
+    Ok(theseus::instance::set_group_memberships(updates).await?)
+}
+
 #[tauri::command]
 pub async fn instance_delete_screenshots(
     keys: Vec<theseus::instance::ScreenshotKey>,

apps/app/src/api/utils.rs

@@ -25,6 +25,7 @@ pub fn init<R: Runtime>() -> tauri::plugin::TauriPlugin<R> {
             open_path,
             show_launcher_logs_folder,
             export_error_logs,
+            export_launcher_logs,
             show_app_db_backups_folder,
             progress_bars_list,
             get_opening_command,
@@ -164,6 +165,312 @@ pub async fn export_error_logs(
     Ok(())
 }
 
+/// Time window included in a launcher log export.
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum LogExportRange {
+    Last30Minutes,
+    Last2Hours,
+    All,
+}
+
+impl LogExportRange {
+    fn max_age(self) -> Option<std::time::Duration> {
+        match self {
+            Self::Last30Minutes => {
+                Some(std::time::Duration::from_secs(30 * 60))
+            }
+            Self::Last2Hours => {
+                Some(std::time::Duration::from_secs(2 * 60 * 60))
+            }
+            Self::All => None,
+        }
+    }
+
+    fn label(self) -> &'static str {
+        match self {
+            Self::Last30Minutes => "last 30 minutes",
+            Self::Last2Hours => "last 2 hours",
+            Self::All => "all sessions",
+        }
+    }
+}
+
+/// Lowest level included in a launcher log export.
+#[derive(Debug, Clone, Copy, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub enum LogExportLevel {
+    All,
+    Debug,
+    Info,
+}
+
+impl LogExportLevel {
+    fn minimum(self) -> Option<&'static str> {
+        match self {
+            Self::All => None,
+            Self::Debug => Some("debug"),
+            Self::Info => Some("info"),
+        }
+    }
+
+    fn label(self) -> &'static str {
+        match self {
+            Self::All => "all levels",
+            Self::Debug => "debug and above",
+            Self::Info => "info and above",
+        }
+    }
+}
+
+/// Instance log tail included in an export, in bytes.
+const LOG_EXPORT_INSTANCE_LOG_TAIL_BYTES: u64 = 512 * 1024;
+
+/// Export launcher logs (filtered by time range and level) plus optional
+/// system information, the most recent instance log, and a crash analysis
+/// summary into a ZIP archive.
+#[tauri::command]
+pub async fn export_launcher_logs(
+    output_path: PathBuf,
+    range: LogExportRange,
+    level: LogExportLevel,
+    include_system_info: bool,
+    include_instance_logs: bool,
+    include_crash_analysis: bool,
+) -> Result<()> {
+    // Censoring needs the app state (credentials, IPs). Without it an export
+    // would silently ship secrets, so fail rather than degrade.
+    let state = theseus::State::get().await?;
+    let archive = tokio::fs::File::create(&output_path).await?;
+    let mut writer = ZipFileWriter::with_tokio(archive);
+
+    let (exported_logs, skipped_logs) =
+        write_exported_logs(&mut writer, range, level, &state).await?;
+
+    let mut manifest = format!(
+        "Starlight Launcher log export\n\
+         Exported at: {}\n\
+         App version: {}\n\
+         Time range: {}\n\
+         Level filter: {}\n\
+         System information: {}\n\
+         Recent instance log: {}\n\
+         Crash analysis: {}\n\
+         Log files: {exported_logs}\n\n\
+         Access tokens, Minecraft tokens, and IP addresses are replaced with placeholders.\n",
+        chrono::Local::now().to_rfc3339(),
+        env!("CARGO_PKG_VERSION"),
+        range.label(),
+        level.label(),
+        if include_system_info {
+            "included"
+        } else {
+            "omitted"
+        },
+        if include_instance_logs {
+            "included"
+        } else {
+            "omitted"
+        },
+        if include_crash_analysis {
+            "included"
+        } else {
+            "omitted"
+        },
+    );
+    if !skipped_logs.is_empty() {
+        manifest.push_str("\nSkipped unreadable log files:\n");
+        for name in &skipped_logs {
+            manifest.push_str(&format!("- {name}\n"));
+        }
+    }
+    write_zip_entry(&mut writer, "manifest.txt", manifest.as_bytes()).await?;
+
+    if include_system_info {
+        let environment = build_environment_report();
+        let environment = censor_export_text(environment, &state).await?;
+        write_zip_entry(
+            &mut writer,
+            "system-information.txt",
+            environment.as_bytes(),
+        )
+        .await?;
+    }
+
+    let recent_instance = if include_instance_logs || include_crash_analysis {
+        newest_instance_log(&state).await
+    } else {
+        None
+    };
+
+    if include_instance_logs
+        && let Some((instance_id, path)) = recent_instance.as_ref()
+    {
+        let tail = read_file_tail(path, LOG_EXPORT_INSTANCE_LOG_TAIL_BYTES)?;
+        let tail = censor_export_text(tail, &state).await?;
+        write_zip_entry(
+            &mut writer,
+            &format!("minecraft/{instance_id}/latest.log"),
+            tail.as_bytes(),
+        )
+        .await?;
+    }
+
+    if include_crash_analysis
+        && let Some((instance_id, _)) = recent_instance.as_ref()
+        && let Ok(analysis) = theseus::logs::analyze_crash(instance_id).await
+        && (analysis.crashed || !analysis.findings.is_empty())
+        && let Ok(report) = serde_json::to_vec_pretty(&analysis)
+    {
+        // The analysis carries raw log text and Windows event messages, so it
+        // goes through the same censoring as the exported logs.
+        let report = censor_export_text(
+            String::from_utf8_lossy(&report).into_owned(),
+            &state,
+        )
+        .await?;
+        write_zip_entry(
+            &mut writer,
+            &format!("minecraft/{instance_id}/crash-analysis.json"),
+            report.as_bytes(),
+        )
+        .await?;
+    }
+
+    writer.close().await.map_err(zip_error)?;
+    Ok(())
+}
+
+/// Writes the matching launcher logs and reports how many were written plus
+/// the names of any files that could not be read.
+async fn write_exported_logs(
+    writer: &mut ZipFileWriter<tokio::fs::File>,
+    range: LogExportRange,
+    level: LogExportLevel,
+    state: &theseus::State,
+) -> Result<(usize, Vec<String>)> {
+    let Some(directories) = DirectoryInfo::global_handle_if_ready() else {
+        return Ok((0, Vec::new()));
+    };
+    let Some(logs_dir) = directories.launcher_logs_dir() else {
+        return Ok((0, Vec::new()));
+    };
+    if !tokio::fs::try_exists(&logs_dir).await? {
+        return Ok((0, Vec::new()));
+    }
+
+    let mut entries = tokio::fs::read_dir(&logs_dir).await?;
+    let mut paths = Vec::new();
+    while let Some(entry) = entries.next_entry().await? {
+        let path = entry.path();
+        let is_session_log =
+            path.file_name().and_then(|name| name.to_str()).is_some_and(
+                |name| name.starts_with("session_") && name.ends_with(".log"),
+            );
+        if is_session_log && entry.file_type().await?.is_file() {
+            paths.push(path);
+        }
+    }
+    paths.sort();
+
+    let mut exported = 0;
+    let mut skipped = Vec::new();
+    for path in paths {
+        let file_name = path
+            .file_name()
+            .map(|name| name.to_string_lossy().into_owned())
+            .unwrap_or_else(|| "session.log".to_string());
+
+        // A single unreadable file must not lose the whole report.
+        let Ok(contents) = tokio::fs::read(&path).await else {
+            skipped.push(file_name);
+            continue;
+        };
+        let filtered = theseus::filter_log_contents(
+            &contents,
+            range.max_age(),
+            level.minimum(),
+        );
+        let text = String::from_utf8_lossy(&filtered).into_owned();
+        let censored = censor_export_text(text, state).await?;
+        write_zip_entry(
+            writer,
+            &format!("launcher_logs/{file_name}"),
+            censored.as_bytes(),
+        )
+        .await?;
+        exported += 1;
+    }
+
+    Ok((exported, skipped))
+}
+
+/// Replaces credentials and IP addresses with placeholders. Censoring failures
+/// propagate so an export never ships unredacted content.
+async fn censor_export_text(
+    text: String,
+    state: &theseus::State,
+) -> Result<String> {
+    Ok(theseus::install::censor_shared_text(text, state).await?)
+}
+
+fn build_environment_report() -> String {
+    format!(
+        "Starlight Launcher environment\n\
+         App version: {}\n\
+         Operating system: {}\n\
+         Architecture: {}\n",
+        env!("CARGO_PKG_VERSION"),
+        std::env::consts::OS,
+        std::env::consts::ARCH,
+    )
+}
+
+/// The instance whose log was written most recently, if any.
+async fn newest_instance_log(
+    state: &theseus::State,
+) -> Option<(String, PathBuf)> {
+    let instances_dir = state.directories.instances_dir();
+    let mut entries = tokio::fs::read_dir(&instances_dir).await.ok()?;
+    let mut newest: Option<(std::time::SystemTime, String, PathBuf)> = None;
+
+    while let Some(entry) = entries.next_entry().await.ok()? {
+        if !entry.file_type().await.ok()?.is_dir() {
+            continue;
+        }
+        let log_path = entry.path().join("logs").join("latest.log");
+        let Ok(metadata) = tokio::fs::metadata(&log_path).await else {
+            continue;
+        };
+        let Ok(modified) = metadata.modified() else {
+            continue;
+        };
+        let is_newer = newest
+            .as_ref()
+            .is_none_or(|(newest_modified, ..)| modified > *newest_modified);
+        if is_newer {
+            let id = entry.file_name().to_string_lossy().into_owned();
+            newest = Some((modified, id, log_path));
+        }
+    }
+
+    newest.map(|(_, id, path)| (id, path))
+}
+
+fn read_file_tail(path: &Path, max_bytes: u64) -> Result<String> {
+    use std::io::{Read, Seek, SeekFrom};
+
+    let mut file = std::fs::File::open(path)?;
+    let length = file.metadata()?.len();
+    if length > max_bytes {
+        file.seek(SeekFrom::Start(length - max_bytes))?;
+    }
+
+    let mut contents = Vec::new();
+    file.read_to_end(&mut contents)?;
+    Ok(String::from_utf8_lossy(&contents).into_owned())
+}
+
 async fn write_zip_file(
     writer: &mut ZipFileWriter<tokio::fs::File>,
     filename: &str,

apps/app/src/lightweight_mode.rs

@@ -253,6 +253,14 @@ impl LightweightMode {
                     if payload.maximize_window {
                         maximize_minecraft_window(payload.pid).await;
                     }
+                    if let Some(title) = payload
+                        .window_title
+                        .as_ref()
+                        .map(|value| value.trim())
+                        .filter(|value| !value.is_empty())
+                    {
+                        rename_minecraft_window(payload.pid, title).await;
+                    }
                     let settings = match theseus::settings::get().await {
                         Ok(settings) => settings,
                         Err(error) => {
@@ -332,6 +340,8 @@ struct ProcessEventPayload {
     pid: u32,
     #[serde(default)]
     maximize_window: bool,
+    #[serde(default)]
+    window_title: Option<String>,
     event: String,
     crashed: Option<bool>,
     #[serde(default)]
@@ -339,7 +349,7 @@ struct ProcessEventPayload {
 }
 
 #[cfg(target_os = "windows")]
-use std::sync::atomic::{AtomicBool, AtomicU32, Ordering};
+use std::sync::atomic::{AtomicBool, AtomicIsize, AtomicU32, Ordering};
 
 #[cfg(target_os = "windows")]
 static MAXIMIZE_PROCESS_ID: AtomicU32 = AtomicU32::new(0);
@@ -400,6 +410,74 @@ async fn maximize_minecraft_window(pid: u32) {
 
 #[cfg(not(target_os = "windows"))]
 async fn maximize_minecraft_window(_pid: u32) {}
+#[cfg(target_os = "windows")]
+static RENAME_WINDOW_HANDLE: AtomicIsize = AtomicIsize::new(0);
+
+#[cfg(target_os = "windows")]
+unsafe extern "system" fn rename_if_owned_by_process(
+    hwnd: windows::Win32::Foundation::HWND,
+    _: windows::Win32::Foundation::LPARAM,
+) -> windows::core::BOOL {
+    use windows::Win32::UI::WindowsAndMessaging::{
+        GetWindowThreadProcessId, IsWindowVisible,
+    };
+    use windows::core::BOOL;
+
+    let mut window_pid = 0;
+    unsafe { GetWindowThreadProcessId(hwnd, Some(&mut window_pid)) };
+    if window_pid == MAXIMIZE_PROCESS_ID.load(Ordering::Relaxed)
+        && unsafe { IsWindowVisible(hwnd).as_bool() }
+    {
+        RENAME_WINDOW_HANDLE.store(hwnd.0 as isize, Ordering::Relaxed);
+        return BOOL(0);
+    }
+    BOOL(1)
+}
+
+#[cfg(target_os = "windows")]
+async fn rename_minecraft_window(pid: u32, title: &str) {
+    if pid == 0 || title.is_empty() {
+        return;
+    }
+
+    // PCL keeps re-applying the title: FML/Quilt and some mods reset it
+    // while the game boots, so a one-shot rename is not enough.
+    let deadline =
+        tokio::time::Instant::now() + std::time::Duration::from_secs(45);
+    let mut applied = false;
+    loop {
+        let found = {
+            let _guard = MAXIMIZE_WINDOW_ENUMERATION.lock();
+            MAXIMIZE_PROCESS_ID.store(pid, Ordering::Relaxed);
+            RENAME_WINDOW_HANDLE.store(0, Ordering::Relaxed);
+            unsafe {
+                use windows::Win32::Foundation::LPARAM;
+                use windows::Win32::UI::WindowsAndMessaging::EnumWindows;
+                let _ =
+                    EnumWindows(Some(rename_if_owned_by_process), LPARAM(0));
+            }
+            RENAME_WINDOW_HANDLE.load(Ordering::Relaxed)
+        };
+        if found != 0 {
+            let hwnd = windows::Win32::Foundation::HWND(found as *mut _);
+            let wide: Vec<u16> = title.encode_utf16().chain(Some(0)).collect();
+            unsafe {
+                use windows::Win32::UI::WindowsAndMessaging::SetWindowTextW;
+                let _ =
+                    SetWindowTextW(hwnd, windows::core::PCWSTR(wide.as_ptr()));
+            }
+            applied = true;
+        }
+        if tokio::time::Instant::now() >= deadline {
+            return;
+        }
+        let _ = applied;
+        tokio::time::sleep(std::time::Duration::from_millis(400)).await;
+    }
+}
+
+#[cfg(not(target_os = "windows"))]
+async fn rename_minecraft_window(_pid: u32, _title: &str) {}
 
 #[tauri::command]
 pub fn lightweight_mode_frontend_ready(

packages/app-lib/migrations/20261004000000_custom-window-title.sql

@@ -0,0 +1,2 @@
+ALTER TABLE settings ADD COLUMN custom_window_title_enabled INTEGER NOT NULL DEFAULT FALSE;
+ALTER TABLE settings ADD COLUMN default_window_title TEXT NOT NULL DEFAULT 'Minecraft';

packages/app-lib/src/api/instance/groups.rs

@@ -0,0 +1,261 @@
+use crate::event::emit::emit_instance_groups_changed;
+use crate::state::instance_groups;
+use serde::{Deserialize, Serialize};
+use std::collections::HashSet;
+use uuid::Uuid;
+
+const MAX_GROUP_NAME_LENGTH: usize = 256;
+pub const FAVORITES_GROUP_ID: &str = instance_groups::FAVORITES_GROUP_ID;
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct InstanceGroup {
+    pub id: String,
+    pub name: String,
+}
+
+#[derive(Debug, Clone, Deserialize, Serialize)]
+pub struct InstanceGroupMembershipUpdate {
+    pub instance_id: String,
+    pub group_ids: Vec<String>,
+}
+
+fn validate_group_name(name: &str) -> crate::Result<&str> {
+    let name = name.trim();
+
+    if name.is_empty() {
+        return Err(crate::ErrorKind::InputError(
+            "Group name cannot be empty".to_string(),
+        )
+        .into());
+    }
+
+    if name.chars().count() > MAX_GROUP_NAME_LENGTH {
+        return Err(crate::ErrorKind::InputError(format!(
+            "Group name cannot exceed {MAX_GROUP_NAME_LENGTH} characters"
+        ))
+        .into());
+    }
+
+    if name.eq_ignore_ascii_case("none") {
+        return Err(crate::ErrorKind::InputError(
+            "Group name cannot be None".to_string(),
+        )
+        .into());
+    }
+
+    Ok(name)
+}
+
+fn normalize_membership_updates(
+    mut updates: Vec<InstanceGroupMembershipUpdate>,
+) -> crate::Result<Vec<InstanceGroupMembershipUpdate>> {
+    let mut instance_ids = HashSet::new();
+    for update in &mut updates {
+        if !instance_ids.insert(update.instance_id.clone()) {
+            return Err(crate::ErrorKind::InputError(format!(
+                "Duplicate instance {} in group membership update",
+                update.instance_id
+            ))
+            .into());
+        }
+
+        let mut group_ids = HashSet::new();
+        update
+            .group_ids
+            .retain(|group_id| group_ids.insert(group_id.clone()));
+    }
+
+    Ok(updates)
+}
+
+pub async fn list_groups() -> crate::Result<Vec<InstanceGroup>> {
+    Ok(instance_groups::list()
+        .into_iter()
+        .map(|group| InstanceGroup {
+            id: group.id,
+            name: group.name,
+        })
+        .collect())
+}
+
+pub async fn create_group(name: String) -> crate::Result<InstanceGroup> {
+    let name = validate_group_name(&name)?;
+    let id = Uuid::new_v4().to_string();
+    instance_groups::create(&id, name);
+
+    Ok(InstanceGroup {
+        id,
+        name: name.to_string(),
+    })
+}
+
+pub async fn set_group_order(group_ids: Vec<String>) -> crate::Result<()> {
+    instance_groups::set_order(&group_ids);
+    Ok(())
+}
+
+pub async fn set_group_memberships(
+    updates: Vec<InstanceGroupMembershipUpdate>,
+) -> crate::Result<()> {
+    if updates.is_empty() {
+        return Ok(());
+    }
+
+    let updates = normalize_membership_updates(updates)?;
+
+    // Note: the instances themselves are deliberately not validated here.
+    // JSON-backed instances (`local:` ids) have no row in the `instances` table,
+    // and requiring one is what used to make grouping them fail outright.
+    let unique_group_ids = updates
+        .iter()
+        .flat_map(|update| update.group_ids.iter())
+        .collect::<HashSet<_>>();
+    for group_id in unique_group_ids {
+        if !instance_groups::group_exists(group_id) {
+            return Err(crate::ErrorKind::InputError(format!(
+                "Unknown instance group {group_id}"
+            ))
+            .into());
+        }
+    }
+
+    instance_groups::set_memberships(
+        &updates
+            .iter()
+            .map(|update| {
+                (update.instance_id.clone(), update.group_ids.clone())
+            })
+            .collect::<Vec<_>>(),
+    );
+
+    let instance_ids = updates
+        .into_iter()
+        .map(|update| update.instance_id)
+        .collect::<Vec<_>>();
+    emit_instance_groups_changed(&instance_ids).await?;
+
+    Ok(())
+}
+
+pub async fn rename_group(
+    id: String,
+    new_name: String,
+) -> crate::Result<InstanceGroup> {
+    if id == FAVORITES_GROUP_ID {
+        return Err(crate::ErrorKind::InputError(
+            "Favorites cannot be renamed".to_string(),
+        )
+        .into());
+    }
+
+    let new_name = validate_group_name(&new_name)?;
+
+    let Some(instance_ids) = instance_groups::rename(&id, new_name) else {
+        return Err(crate::ErrorKind::InputError(format!(
+            "Unknown instance group {id}"
+        ))
+        .into());
+    };
+
+    emit_instance_groups_changed(&instance_ids).await?;
+
+    Ok(InstanceGroup {
+        id,
+        name: new_name.to_string(),
+    })
+}
+
+pub async fn delete_group(id: String) -> crate::Result<()> {
+    if id == FAVORITES_GROUP_ID {
+        return Err(crate::ErrorKind::InputError(
+            "Favorites cannot be deleted".to_string(),
+        )
+        .into());
+    }
+
+    let Some(instance_ids) = instance_groups::delete(&id) else {
+        return Err(crate::ErrorKind::InputError(format!(
+            "Unknown instance group {id}"
+        ))
+        .into());
+    };
+
+    emit_instance_groups_changed(&instance_ids).await?;
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{
+        FAVORITES_GROUP_ID, InstanceGroupMembershipUpdate,
+        MAX_GROUP_NAME_LENGTH, normalize_membership_updates,
+        validate_group_name,
+    };
+
+    #[test]
+    fn group_name_validation_trims_valid_names() {
+        assert_eq!(validate_group_name("  My group  ").unwrap(), "My group");
+    }
+
+    #[test]
+    fn group_name_validation_rejects_empty_names() {
+        assert!(validate_group_name("   ").is_err());
+    }
+
+    #[test]
+    fn group_name_validation_rejects_reserved_name() {
+        assert!(validate_group_name("NoNe").is_err());
+    }
+
+    #[test]
+    fn group_name_validation_allows_favorites() {
+        assert_eq!(validate_group_name("Favorites").unwrap(), "Favorites");
+    }
+
+    #[test]
+    fn group_name_validation_rejects_long_names() {
+        assert!(
+            validate_group_name(&"a".repeat(MAX_GROUP_NAME_LENGTH + 1))
+                .is_err()
+        );
+    }
+
+    #[test]
+    fn favorites_group_id_is_stable() {
+        assert_eq!(FAVORITES_GROUP_ID, "group:favorites");
+    }
+
+    #[test]
+    fn membership_updates_reject_duplicate_instances() {
+        let updates = vec![
+            InstanceGroupMembershipUpdate {
+                instance_id: "instance".to_string(),
+                group_ids: vec!["first".to_string()],
+            },
+            InstanceGroupMembershipUpdate {
+                instance_id: "instance".to_string(),
+                group_ids: vec!["second".to_string()],
+            },
+        ];
+
+        assert!(normalize_membership_updates(updates).is_err());
+    }
+
+    #[test]
+    fn membership_updates_deduplicate_groups() {
+        let updates =
+            normalize_membership_updates(vec![InstanceGroupMembershipUpdate {
+                instance_id: "instance".to_string(),
+                group_ids: vec![
+                    "a".to_string(),
+                    "b".to_string(),
+                    "a".to_string(),
+                    "b".to_string(),
+                ],
+            }])
+            .unwrap();
+
+        assert_eq!(updates[0].group_ids, &["a", "b"]);
+    }
+}

packages/app-lib/src/api/instance/mod.rs

@@ -5,6 +5,7 @@ mod content;
 mod core_components;
 mod export_mrpack;
 mod get;
+mod groups;
 mod home;
 mod install;
 mod lifecycle;
@@ -72,6 +73,11 @@ pub use self::export_mrpack::{
     create_mrpack_json, export_mrpack, get_pack_export_candidates,
 };
 pub use self::get::{get, get_many, list};
+pub use self::groups::{
+    FAVORITES_GROUP_ID, InstanceGroup, InstanceGroupMembershipUpdate,
+    create_group, delete_group, list_groups, rename_group,
+    set_group_memberships, set_group_order,
+};
 pub use self::home::{
     get_daily_playtime, get_daily_playtime_details, set_pinned,
 };

packages/app-lib/src/api/instance/run.rs

@@ -250,6 +250,17 @@ async fn run_credentials(
         .launch_overrides
         .maximize_window
         .unwrap_or(settings.maximize_window);
+    let window_title = settings
+        .custom_window_title_enabled
+        .then(|| {
+            context
+                .launch_overrides
+                .window_title
+                .clone()
+                .filter(|value| !value.trim().is_empty())
+                .unwrap_or_else(|| settings.default_window_title.clone())
+        })
+        .filter(|value| !value.trim().is_empty());
     let env_args = context
         .launch_overrides
         .custom_env_vars
@@ -319,6 +330,7 @@ async fn run_credentials(
         &memory,
         &resolution,
         maximize_window,
+        window_title,
         credentials,
         post_exit_hook,
         &context,

packages/app-lib/src/api/pack/import/axolotl.rs

@@ -157,6 +157,7 @@ pub(crate) async fn import_axolotl(
                 ),
                 maximize_window: Some(config.launch_overrides.maximize_window),
                 game_resolution: Some(config.launch_overrides.game_resolution),
+                window_title: None,
                 launch_preparation_timeout: Some(
                     config.launch_overrides.launch_preparation_timeout,
                 ),

packages/app-lib/src/event/emit.rs

@@ -6,8 +6,9 @@ use crate::event::{
 };
 #[cfg(feature = "tauri")]
 use crate::event::{
-    InstancePayload, JavaDiscoveryPayload, JavaDownloadConfirmationPayload,
-    LoadingPayload, ProcessPayload, ServerPayload, WarningPayload,
+    InstanceGroupsChangedPayload, InstancePayload, JavaDiscoveryPayload,
+    JavaDownloadConfirmationPayload, LoadingPayload, ProcessPayload,
+    ServerPayload, WarningPayload,
 };
 use futures::prelude::*;
 use serde_json::Value;
@@ -400,6 +401,7 @@ pub async fn emit_process(
     uuid: Uuid,
     pid: u32,
     maximize_window: bool,
+    window_title: Option<String>,
     event: ProcessPayloadType,
     message: &str,
     crashed: Option<bool>,
@@ -416,6 +418,7 @@ pub async fn emit_process(
                     uuid,
                     pid,
                     maximize_window,
+                    window_title,
                     event,
                     message: message.to_string(),
                     crashed,
@@ -486,6 +489,26 @@ pub async fn emit_friend(payload: FriendPayload) -> crate::Result<()> {
     Ok(())
 }
 
+#[allow(unused_variables)]
+pub async fn emit_instance_groups_changed(
+    instance_ids: &[String],
+) -> crate::Result<()> {
+    #[cfg(feature = "tauri")]
+    {
+        let event_state = crate::EventState::get()?;
+        event_state
+            .app
+            .emit(
+                "instance_groups_changed",
+                InstanceGroupsChangedPayload {
+                    instance_ids: instance_ids.to_vec(),
+                },
+            )
+            .map_err(EventError::from)?;
+    }
+    Ok(())
+}
+
 #[allow(unused_variables)]
 pub async fn emit_notification(payload: Value) -> crate::Result<()> {
     #[cfg(feature = "tauri")]

packages/app-lib/src/event/mod.rs

@@ -336,6 +336,8 @@ pub struct ProcessPayload {
     pub uuid: Uuid,
     pub pid: u32,
     pub maximize_window: bool,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub window_title: Option<String>,
     pub event: ProcessPayloadType,
     pub message: String,
     #[serde(skip_serializing_if = "Option::is_none")]
@@ -393,6 +395,10 @@ pub enum ServerPayloadType {
         eula_text: String,
     },
 }
+#[derive(Serialize, Clone)]
+pub struct InstanceGroupsChangedPayload {
+    pub instance_ids: Vec<String>,
+}
 
 #[derive(Serialize, Clone)]
 #[cfg(feature = "tauri")]

packages/app-lib/src/install/diagnostics.rs

@@ -670,7 +670,7 @@ fn read_file_tail(path: &Path, max_bytes: u64) -> crate::Result<String> {
     Ok(output)
 }
 
-async fn censor_support_text(
+pub(crate) async fn censor_support_text(
     mut text: String,
     state: &State,
 ) -> crate::Result<String> {

packages/app-lib/src/install/mod.rs

@@ -41,3 +41,12 @@ pub use runner::{
     retry_job, retry_job_as_new, skip_missing_content_and_resume_job,
     update_managed_curseforge_modpack, upgrade_unmanaged_instance,
 };
+
+/// Replaces credentials and IP addresses in text the user may share publicly
+/// (support reports, exported logs) with placeholders.
+pub async fn censor_shared_text(
+    text: String,
+    state: &crate::State,
+) -> crate::Result<String> {
+    diagnostics::censor_support_text(text, state).await
+}

packages/app-lib/src/launcher/mod.rs

@@ -1520,6 +1520,7 @@ pub async fn launch_minecraft(
     memory: &MemorySettings,
     resolution: &WindowSize,
     maximize_window: bool,
+    window_title: Option<String>,
     credentials: &Credentials,
     post_exit_hook: Option<String>,
     context: &InstanceLaunchContext,
@@ -2391,6 +2392,7 @@ pub async fn launch_minecraft(
             command,
             post_exit_hook,
             maximize_window,
+            window_title,
             instance_path.clone(),
             logs_folder,
             version_info.logging.is_some(),

packages/app-lib/src/lib.rs

@@ -28,6 +28,7 @@ pub use event::{
     EventState, LoadingBar, LoadingBarType, emit::emit_loading,
     emit::init_loading,
 };
+pub use logger::filter_log_contents;
 pub use logger::start_logger;
 pub use state::db::{
     backup_current_app_db_for_update, beta_database_exists,

packages/app-lib/src/logger.rs

@@ -240,6 +240,114 @@ fn launcher_log_is_expired(
     now.duration_since(created).is_ok_and(|age| age > max_age)
 }
 
+/// Ordinal for the levels the launcher writes, ordered from most to least
+/// verbose. Unknown tokens are ignored so unrecognized lines are never pruned.
+fn log_level_ordinal(token: &str) -> Option<u8> {
+    match token {
+        "TRACE" => Some(0),
+        "DEBUG" => Some(1),
+        "INFO" => Some(2),
+        "WARN" => Some(3),
+        "ERROR" => Some(4),
+        _ => None,
+    }
+}
+
+fn log_level_minimum_ordinal(level: &str) -> Option<u8> {
+    match level {
+        "trace" => Some(0),
+        "debug" => Some(1),
+        "info" => Some(2),
+        "warn" => Some(3),
+        "error" => Some(4),
+        _ => None,
+    }
+}
+
+/// How a log line relates to the surrounding entries.
+enum LogEntryHeader {
+    /// Timestamp and level parsed: the entry can be filtered.
+    Classified(chrono::DateTime<chrono::FixedOffset>, u8),
+    /// Timestamp parsed but the level is unknown: keep it rather than
+    /// dropping content this logic does not understand.
+    Unclassified,
+}
+
+/// Reads the timestamp and level of an entry line. Continuation lines of a
+/// multi-line message carry no prefix and return `None`, so callers keep them
+/// grouped with the entry they belong to.
+fn parse_log_entry_header(line: &str) -> Option<LogEntryHeader> {
+    let (timestamp, rest) = line.split_once(char::is_whitespace)?;
+    let timestamp = chrono::DateTime::parse_from_rfc3339(timestamp).ok()?;
+    let level = rest.trim_start().split_whitespace().next()?;
+    Some(match log_level_ordinal(level) {
+        Some(ordinal) => LogEntryHeader::Classified(timestamp, ordinal),
+        None => LogEntryHeader::Unclassified,
+    })
+}
+
+/// Keeps or drops whole log entries by a predicate over their timestamp and
+/// level ordinal, returning `None` when nothing was dropped.
+///
+/// Multi-line messages are kept or dropped together with their header, the
+/// bytes of kept lines are preserved exactly (no re-encoding), and entries
+/// whose level cannot be classified are always kept.
+fn filter_log_entries<F>(contents: &[u8], keep: F) -> Option<Vec<u8>>
+where
+    F: Fn(chrono::DateTime<chrono::FixedOffset>, u8) -> bool,
+{
+    let mut kept = Vec::with_capacity(contents.len());
+    let mut changed = false;
+    let mut keep_entry = true;
+
+    for line in contents.split_inclusive(|byte| *byte == b'\n') {
+        match parse_log_entry_header(&String::from_utf8_lossy(line)) {
+            Some(LogEntryHeader::Classified(timestamp, ordinal)) => {
+                keep_entry = keep(timestamp, ordinal);
+            }
+            Some(LogEntryHeader::Unclassified) => keep_entry = true,
+            // Continuation line: it follows the decision of its entry.
+            None => {}
+        }
+
+        if keep_entry {
+            kept.extend_from_slice(line);
+        } else {
+            changed = true;
+        }
+    }
+
+    changed.then_some(kept)
+}
+
+/// Filters launcher log bytes for an export: entries older than `max_age` and
+/// entries below `min_level` are removed. Pass `None` for either bound to keep
+/// everything on that axis. Multi-line messages stay intact.
+pub fn filter_log_contents(
+    contents: &[u8],
+    max_age: Option<std::time::Duration>,
+    min_level: Option<&str>,
+) -> Vec<u8> {
+    let now = chrono::Local::now().fixed_offset();
+    let minimum = min_level.and_then(log_level_minimum_ordinal);
+
+    filter_log_entries(contents, |timestamp, ordinal| {
+        if let Some(minimum) = minimum
+            && ordinal < minimum
+        {
+            return false;
+        }
+        if let Some(max_age) = max_age {
+            let age = (now - timestamp).to_std().unwrap_or_default();
+            if age > max_age {
+                return false;
+            }
+        }
+        true
+    })
+    .unwrap_or_else(|| contents.to_vec())
+}
+
 struct LogEventWriter {
     writer: RotatingLogWriter,
     buffer: Vec<u8>,

packages/app-lib/src/state/instance_groups.rs

@@ -0,0 +1,613 @@
+//! Instance grouping backed by a standalone JSON file in the app's settings
+//! directory, next to `settings.json`.
+//!
+//! Groups used to live in SQLite (`instance_groups` /
+//! `instance_group_memberships`). That layout could not express membership for
+//! JSON-backed instances (`local:` ids, i.e. every `.minecraft` and
+//! multi-library instance) because they have no row in the `instances` table,
+//! and it duplicated membership into the per-instance sidecars. This module is
+//! the single source of truth instead; the SQL tables are left untouched but
+//! are no longer read or written (they are only read once, at import time).
+
+use crate::state::State;
+use serde::{Deserialize, Serialize};
+use std::collections::{HashMap, HashSet};
+use std::fs;
+use std::path::PathBuf;
+use std::sync::{OnceLock, RwLock};
+use tracing::{info, warn};
+
+pub const INSTANCE_GROUPS_FILE_NAME: &str = "instance_groups.json";
+
+/// Current `instance_groups.json` schema version.
+pub const INSTANCE_GROUPS_SCHEMA_VERSION: u32 = 1;
+
+pub const FAVORITES_GROUP_ID: &str = "group:favorites";
+const FAVORITES_GROUP_NAME: &str = "Pinned";
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct GroupDefinition {
+    pub id: String,
+    pub name: String,
+}
+
+/// On-disk shape. The order of `groups` *is* the display order, so no
+/// `display_order` field is needed: the public API only ever communicates
+/// ordering through the order of `list()` and `set_order()`.
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct InstanceGroupsFile {
+    #[serde(default)]
+    pub schema_version: u32,
+    #[serde(default)]
+    pub groups: Vec<GroupDefinition>,
+    /// instance id -> group ids.
+    #[serde(default)]
+    pub memberships: HashMap<String, Vec<String>>,
+}
+
+impl Default for InstanceGroupsFile {
+    fn default() -> Self {
+        Self {
+            schema_version: INSTANCE_GROUPS_SCHEMA_VERSION,
+            groups: vec![GroupDefinition {
+                id: FAVORITES_GROUP_ID.to_string(),
+                name: FAVORITES_GROUP_NAME.to_string(),
+            }],
+            memberships: HashMap::new(),
+        }
+    }
+}
+
+impl InstanceGroupsFile {
+    fn has_group(&self, id: &str) -> bool {
+        self.groups.iter().any(|group| group.id == id)
+    }
+
+    /// Guarantees the favorites sentinel exists and sits first, drops
+    /// memberships pointing at groups that no longer exist, and drops instances
+    /// left with no groups at all.
+    fn normalize(&mut self) {
+        self.schema_version = INSTANCE_GROUPS_SCHEMA_VERSION;
+
+        match self.groups.iter().position(|g| g.id == FAVORITES_GROUP_ID) {
+            Some(0) => {}
+            Some(index) => {
+                let favorites = self.groups.remove(index);
+                self.groups.insert(0, favorites);
+            }
+            None => self.groups.insert(
+                0,
+                GroupDefinition {
+                    id: FAVORITES_GROUP_ID.to_string(),
+                    name: FAVORITES_GROUP_NAME.to_string(),
+                },
+            ),
+        }
+
+        let known = self
+            .groups
+            .iter()
+            .map(|group| group.id.clone())
+            .collect::<HashSet<_>>();
+
+        for group_ids in self.memberships.values_mut() {
+            let mut seen = HashSet::new();
+            group_ids
+                .retain(|id| known.contains(id) && seen.insert(id.clone()));
+        }
+        self.memberships
+            .retain(|_, group_ids| !group_ids.is_empty());
+    }
+}
+
+static STORE: OnceLock<RwLock<InstanceGroupsFile>> = OnceLock::new();
+
+fn file_path() -> Option<PathBuf> {
+    let state = State::get_if_initialized()?;
+    Some(
+        state
+            .directories
+            .settings_dir
+            .join(INSTANCE_GROUPS_FILE_NAME),
+    )
+}
+
+/// Reads the store from disk, or `None` when it has never been written.
+fn read_from_disk() -> Option<InstanceGroupsFile> {
+    let path = file_path()?;
+    if !path.exists() {
+        return None;
+    }
+    match fs::read_to_string(&path)
+        .map_err(|e| e.to_string())
+        .and_then(|content| {
+            serde_json::from_str::<InstanceGroupsFile>(&content)
+                .map_err(|e| e.to_string())
+        }) {
+        Ok(mut file) => {
+            file.normalize();
+            Some(file)
+        }
+        Err(error) => {
+            // A corrupt file must not wipe the user's groups silently on the
+            // next write, so bail out to an empty store without touching disk.
+            warn!("Failed to read {INSTANCE_GROUPS_FILE_NAME}: {error}");
+            None
+        }
+    }
+}
+
+fn write_to_disk(file: &InstanceGroupsFile) {
+    let Some(path) = file_path() else {
+        return;
+    };
+    let write = serde_json::to_string_pretty(file)
+        .map_err(|e| e.to_string())
+        .and_then(|content| {
+            fs::write(&path, content).map_err(|e| e.to_string())
+        });
+    if let Err(error) = write {
+        warn!("Failed to save {INSTANCE_GROUPS_FILE_NAME}: {error}");
+    }
+}
+
+fn store() -> &'static RwLock<InstanceGroupsFile> {
+    STORE.get_or_init(|| RwLock::new(read_from_disk().unwrap_or_default()))
+}
+
+fn with_read<T>(f: impl FnOnce(&InstanceGroupsFile) -> T) -> T {
+    let guard = store().read().unwrap_or_else(|e| e.into_inner());
+    f(&guard)
+}
+
+/// Mutates the store and persists the whole file. `f` returns the instance ids
+/// whose membership changed, so callers can emit the change event.
+fn with_write<T>(f: impl FnOnce(&mut InstanceGroupsFile) -> T) -> T {
+    let mut guard = store().write().unwrap_or_else(|e| e.into_inner());
+    let result = f(&mut guard);
+    guard.normalize();
+    write_to_disk(&guard);
+    result
+}
+
+// ── Reads ───────────────────────────────────────────────────────────────────
+
+pub fn list() -> Vec<GroupDefinition> {
+    with_read(|file| file.groups.clone())
+}
+
+pub fn group_exists(id: &str) -> bool {
+    with_read(|file| file.has_group(id))
+}
+
+/// Group ids for one instance, in the order they were assigned. Synchronous so
+/// that `instance_metadata_from_instance` can call it.
+pub fn group_ids_for(instance_id: &str) -> Vec<String> {
+    with_read(|file| {
+        file.memberships
+            .get(instance_id)
+            .cloned()
+            .unwrap_or_default()
+    })
+}
+
+fn instances_in_group(
+    file: &InstanceGroupsFile,
+    group_id: &str,
+) -> Vec<String> {
+    file.memberships
+        .iter()
+        .filter(|(_, group_ids)| group_ids.iter().any(|id| id == group_id))
+        .map(|(instance_id, _)| instance_id.clone())
+        .collect()
+}
+
+// ── Writes ──────────────────────────────────────────────────────────────────
+
+/// Adds a group at the top of the list, matching the previous SQL behavior
+/// where new groups got the lowest `display_order`. Favorites stays first.
+pub fn create(id: &str, name: &str) {
+    with_write(|file| {
+        let definition = GroupDefinition {
+            id: id.to_string(),
+            name: name.to_string(),
+        };
+        // `normalize` moves favorites back to index 0 afterwards.
+        file.groups.insert(0, definition);
+    });
+}
+
+/// Renames a group, returning the affected instance ids, or `None` when the
+/// group does not exist.
+pub fn rename(id: &str, name: &str) -> Option<Vec<String>> {
+    with_write(|file| {
+        let group = file.groups.iter_mut().find(|group| group.id == id)?;
+        group.name = name.to_string();
+        Some(instances_in_group(file, id))
+    })
+}
+
+/// Deletes a group and strips it from every instance, returning the affected
+/// instance ids, or `None` when the group does not exist.
+pub fn delete(id: &str) -> Option<Vec<String>> {
+    with_write(|file| {
+        let index = file.groups.iter().position(|group| group.id == id)?;
+        let affected = instances_in_group(file, id);
+        file.groups.remove(index);
+        // `normalize` prunes the now-dangling ids out of `memberships`.
+        Some(affected)
+    })
+}
+
+/// Reorders groups to match `group_ids`. Groups missing from the argument keep
+/// their relative order at the end, so a stale frontend list can never drop a
+/// group. Favorites is pinned first regardless.
+pub fn set_order(group_ids: &[String]) {
+    with_write(|file| reorder_groups(&mut file.groups, group_ids));
+}
+
+/// Reorders `groups` to match `group_ids`. Groups the argument omits keep their
+/// relative order after the listed ones, so a stale frontend list can never drop
+/// a group. Pure so the ordering rules can be tested without the process-wide
+/// store, which tests would otherwise race over.
+fn reorder_groups(groups: &mut Vec<GroupDefinition>, group_ids: &[String]) {
+    let mut remaining = std::mem::take(groups);
+    let mut ordered = Vec::with_capacity(remaining.len());
+    for id in group_ids {
+        if id == FAVORITES_GROUP_ID {
+            continue;
+        }
+        if let Some(index) = remaining.iter().position(|group| &group.id == id)
+        {
+            ordered.push(remaining.remove(index));
+        }
+    }
+    ordered.extend(remaining);
+    *groups = ordered;
+}
+
+/// Replaces the group list of each given instance wholesale.
+pub fn set_memberships(updates: &[(String, Vec<String>)]) {
+    with_write(|file| {
+        for (instance_id, group_ids) in updates {
+            if group_ids.is_empty() {
+                file.memberships.remove(instance_id);
+            } else {
+                file.memberships
+                    .insert(instance_id.clone(), group_ids.clone());
+            }
+        }
+    });
+}
+
+/// Replaces the group list of a single instance.
+pub fn set_instance_groups(instance_id: &str, group_ids: &[String]) {
+    set_memberships(&[(instance_id.to_string(), group_ids.to_vec())]);
+}
+
+/// Looks a group up by name, creating it if absent, and returns its id.
+/// Used by the legacy launcher import, which only knows group names.
+pub fn find_or_create_by_name(name: &str) -> String {
+    with_write(|file| {
+        if let Some(group) = file.groups.iter().find(|group| group.name == name)
+        {
+            return group.id.clone();
+        }
+        let id = uuid::Uuid::new_v4().to_string();
+        file.groups.push(GroupDefinition {
+            id: id.clone(),
+            name: name.to_string(),
+        });
+        id
+    })
+}
+
+/// Adds one group to an instance, keeping its existing groups.
+pub fn add_instance_to_group(instance_id: &str, group_id: &str) {
+    with_write(|file| {
+        let entry =
+            file.memberships.entry(instance_id.to_string()).or_default();
+        if !entry.iter().any(|id| id == group_id) {
+            entry.push(group_id.to_string());
+        }
+    });
+}
+
+/// Drops an instance's membership entry, e.g. after the instance is deleted.
+pub fn forget_instance(instance_id: &str) {
+    with_write(|file| {
+        file.memberships.remove(instance_id);
+    });
+}
+
+/// Re-keys an instance's membership, e.g. when a `local:` id changes because the
+/// instance directory moved.
+pub fn rename_instance(old_id: &str, new_id: &str) {
+    if old_id == new_id {
+        return;
+    }
+    with_write(|file| {
+        if let Some(group_ids) = file.memberships.remove(old_id) {
+            file.memberships.insert(new_id.to_string(), group_ids);
+        }
+    });
+}
+
+// ── One-time import ─────────────────────────────────────────────────────────
+
+async fn import_sql_groups(
+    pool: &sqlx::SqlitePool,
+) -> crate::Result<InstanceGroupsFile> {
+    let columns: Vec<String> = sqlx::query_scalar(
+        "SELECT name FROM pragma_table_info('instance_groups')",
+    )
+    .fetch_all(pool)
+    .await?;
+    let has_column = |name: &str| columns.iter().any(|column| column == name);
+
+    let mut file = InstanceGroupsFile {
+        schema_version: INSTANCE_GROUPS_SCHEMA_VERSION,
+        groups: Vec::new(),
+        memberships: HashMap::new(),
+    };
+
+    if has_column("id") && has_column("name") {
+        let rows = sqlx::query_as::<_, (String, String)>(
+            "SELECT id, name FROM instance_groups ORDER BY display_order, name, id",
+        )
+        .fetch_all(pool)
+        .await?;
+        for (id, name) in rows {
+            file.groups.push(GroupDefinition { id, name });
+        }
+
+        let has_memberships: bool = sqlx::query_scalar(
+            "SELECT EXISTS(
+                SELECT 1 FROM sqlite_master
+                WHERE type = 'table' AND name = 'instance_group_memberships'
+            )",
+        )
+        .fetch_one(pool)
+        .await?;
+        if has_memberships {
+            let memberships = sqlx::query_as::<_, (String, String)>(
+                "SELECT instance_id, group_id FROM instance_group_memberships",
+            )
+            .fetch_all(pool)
+            .await?;
+            for (instance_id, group_id) in memberships {
+                file.memberships
+                    .entry(instance_id)
+                    .or_default()
+                    .push(group_id);
+            }
+        }
+    } else if has_column("instance_id") && has_column("group_name") {
+        let rows = sqlx::query_as::<_, (String, String)>(
+            "SELECT instance_id, group_name
+             FROM instance_groups
+             ORDER BY group_name, instance_id",
+        )
+        .fetch_all(pool)
+        .await?;
+        let mut group_ids = HashMap::<String, String>::new();
+        for (instance_id, group_name) in rows {
+            let group_id = group_ids
+                .entry(group_name.clone())
+                .or_insert_with(|| uuid::Uuid::new_v4().to_string())
+                .clone();
+            file.memberships
+                .entry(instance_id)
+                .or_default()
+                .push(group_id.clone());
+            if !file.groups.iter().any(|group| group.id == group_id) {
+                file.groups.push(GroupDefinition {
+                    id: group_id,
+                    name: group_name,
+                });
+            }
+        }
+    } else if !columns.is_empty() {
+        warn!(
+            columns = ?columns,
+            "Skipping instance group import from an unrecognized SQLite schema"
+        );
+    }
+
+    file.normalize();
+    Ok(file)
+}
+
+/// Creates `instance_groups.json` from the pre-existing SQLite tables and
+/// instance sidecars, the first time the app runs after this change.
+///
+/// The SQL access here is read-only and happens exactly once; afterwards the
+/// tables are never touched again (they are kept as-is so no DB migration is
+/// needed).
+pub async fn ensure_imported(state: &State) -> crate::Result<()> {
+    let Some(path) = file_path() else {
+        return Ok(());
+    };
+    if path.exists() {
+        // Populate the in-memory cache eagerly so the first synchronous read
+        // does not race with a write.
+        let _ = list();
+        return Ok(());
+    }
+
+    let file = import_sql_groups(&state.pool).await?;
+    let group_count = file.groups.len();
+    let instance_count = file.memberships.len();
+
+    // Seed the cache with the imported data instead of letting `store()` read
+    // the file we are about to write.
+    {
+        let lock = store();
+        let mut guard = lock.write().unwrap_or_else(|e| e.into_inner());
+        *guard = file;
+        write_to_disk(&guard);
+    }
+
+    info!(
+        "Imported {group_count} instance groups covering {instance_count} instances into {INSTANCE_GROUPS_FILE_NAME}"
+    );
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use sqlx::sqlite::SqlitePoolOptions;
+
+    fn file_with_groups(ids: &[&str]) -> InstanceGroupsFile {
+        InstanceGroupsFile {
+            schema_version: INSTANCE_GROUPS_SCHEMA_VERSION,
+            groups: ids
+                .iter()
+                .map(|id| GroupDefinition {
+                    id: id.to_string(),
+                    name: id.to_string(),
+                })
+                .collect(),
+            memberships: HashMap::new(),
+        }
+    }
+
+    #[test]
+    fn normalize_inserts_favorites_first() {
+        let mut file = file_with_groups(&["a", "b"]);
+        file.normalize();
+        assert_eq!(file.groups[0].id, FAVORITES_GROUP_ID);
+        assert_eq!(file.groups.len(), 3);
+    }
+
+    #[test]
+    fn normalize_moves_favorites_to_front() {
+        let mut file = file_with_groups(&["a", FAVORITES_GROUP_ID, "b"]);
+        file.normalize();
+        assert_eq!(file.groups[0].id, FAVORITES_GROUP_ID);
+        assert_eq!(file.groups[1].id, "a");
+        assert_eq!(file.groups[2].id, "b");
+    }
+
+    #[test]
+    fn normalize_drops_orphan_memberships() {
+        let mut file = file_with_groups(&["a"]);
+        file.memberships.insert(
+            "instance".to_string(),
+            vec!["a".to_string(), "nonexistent".to_string()],
+        );
+
+        file.normalize();
+        assert_eq!(file.memberships["instance"], &["a"]);
+    }
+
+    #[test]
+    fn normalize_drops_memberships_for_nonexistent_instances() {
+        let mut file = file_with_groups(&["a"]);
+        file.memberships.insert(
+            "instance".to_string(),
+            vec!["nonexistent1".to_string(), "nonexistent2".to_string()],
+        );
+        file.normalize();
+        assert!(!file.memberships.contains_key("instance"));
+    }
+
+    fn group_ids(groups: &[GroupDefinition]) -> Vec<String> {
+        groups.iter().map(|group| group.id.clone()).collect()
+    }
+
+    #[test]
+    fn set_order_ignores_unknown_ids() {
+        let mut groups = file_with_groups(&["a", "b", "c"]).groups;
+
+        reorder_groups(&mut groups, &["unknown".to_string(), "c".to_string()]);
+
+        // The unknown id matches nothing and simply contributes no group.
+        assert_eq!(group_ids(&groups), vec!["c", "a", "b"]);
+    }
+
+    #[test]
+    fn set_order_retains_missing_groups_at_end() {
+        let mut groups = file_with_groups(&["a", "b", "c"]).groups;
+        groups.push(GroupDefinition {
+            id: "extra".to_string(),
+            name: "extra".to_string(),
+        });
+
+        reorder_groups(&mut groups, &["b".to_string()]);
+
+        // `b` moves to the front and every group the argument omitted survives
+        // after it, so a stale list can never drop a group. Favorites is pinned
+        // by `normalize`, which the store applies around this call.
+        assert_eq!(group_ids(&groups), vec!["b", "a", "c", "extra"]);
+    }
+
+    #[test]
+    fn set_order_keeps_favorites_out_of_the_reorder() {
+        let mut groups = file_with_groups(&["a", FAVORITES_GROUP_ID]).groups;
+
+        reorder_groups(&mut groups, &[FAVORITES_GROUP_ID.to_string()]);
+
+        // Favorites is skipped explicitly and survives at its previous position;
+        // `normalize` moves it to the front afterwards.
+        assert_eq!(group_ids(&groups), vec!["a", FAVORITES_GROUP_ID]);
+    }
+
+    #[test]
+    fn normalize_does_not_lose_favorites_membership() {
+        let mut file = file_with_groups(&[]);
+        file.memberships.insert(
+            "my_instance".to_string(),
+            vec![FAVORITES_GROUP_ID.to_string()],
+        );
+        file.normalize();
+        assert_eq!(file.memberships["my_instance"], &[FAVORITES_GROUP_ID]);
+    }
+
+    #[test]
+    fn normalize_deduplicates_group_ids() {
+        let mut file = file_with_groups(&["a", "b"]);
+        file.memberships.insert(
+            "instance".to_string(),
+            vec!["a".to_string(), "a".to_string(), "b".to_string()],
+        );
+        file.normalize();
+        assert_eq!(file.memberships["instance"].len(), 2);
+    }
+
+    #[tokio::test]
+    async fn imports_legacy_instance_group_schema() {
+        let pool = SqlitePoolOptions::new()
+            .connect("sqlite::memory:")
+            .await
+            .unwrap();
+        sqlx::query(
+            "CREATE TABLE instance_groups (
+                instance_id TEXT NOT NULL,
+                group_name TEXT NOT NULL,
+                PRIMARY KEY (instance_id, group_name)
+            )",
+        )
+        .execute(&pool)
+        .await
+        .unwrap();
+        sqlx::query(
+            "INSERT INTO instance_groups (instance_id, group_name)
+             VALUES ('instance-1', 'Survival'), ('instance-2', 'Survival'),
+                    ('instance-1', 'Creative')",
+        )
+        .execute(&pool)
+        .await
+        .unwrap();
+
+        let file = import_sql_groups(&pool).await.unwrap();
+
+        assert_eq!(file.groups.len(), 3);
+        assert_eq!(file.groups[0].id, FAVORITES_GROUP_ID);
+        assert_eq!(file.memberships["instance-1"].len(), 2);
+        assert_eq!(file.memberships["instance-2"].len(), 1);
+        assert!(file.groups.iter().any(|group| group.name == "Survival"));
+    }
+}

packages/app-lib/src/state/instances/commands/edit_instance.rs

@@ -103,6 +103,12 @@ pub struct InstanceLaunchOverridesPatch {
         skip_serializing_if = "Option::is_none",
         with = "serde_with::rust::double_option"
     )]
+    pub window_title: Option<Option<String>>,
+    #[serde(
+        default,
+        skip_serializing_if = "Option::is_none",
+        with = "serde_with::rust::double_option"
+    )]
     pub launch_preparation_timeout: Option<Option<u64>>,
     pub hooks: Option<Hooks>,
 }
@@ -371,6 +377,10 @@ fn apply_launch_overrides_patch(
     if let Some(game_resolution) = patch.game_resolution {
         overrides.game_resolution = game_resolution;
     }
+    if let Some(window_title) = patch.window_title {
+        overrides.window_title =
+            window_title.filter(|value| !value.trim().is_empty());
+    }
     if let Some(mode) = patch.instance_mode {
         overrides.instance_mode = Some(mode);
     }

packages/app-lib/src/state/instances/commands/get_instance.rs

@@ -1,3 +1,4 @@
+use crate::state::instance_groups;
 use crate::state::instances::{
     ContentSet, Instance, InstanceLaunchOverrides, InstanceLink,
     LoaderComponent,
@@ -91,11 +92,12 @@ impl InstanceMetadata {
         record: instance_rows::InstanceMetadataRecord,
         loader_components: Vec<LoaderComponent>,
     ) -> Self {
+        let groups = instance_groups::group_ids_for(&record.instance.id);
         Self {
             instance: record.instance,
             applied_content_set: record.applied_content_set,
             link: record.link,
-            groups: record.groups,
+            groups,
             launch_overrides: record.launch_overrides,
             loader_components,
             synced_options: Default::default(),

packages/app-lib/src/state/instances/model/launch.rs

@@ -38,6 +38,8 @@ pub struct InstanceLaunchOverrides {
     pub maximize_window: Option<bool>,
     pub game_resolution: Option<WindowSize>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub window_title: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub launch_preparation_timeout: Option<u64>,
     pub hooks: Hooks,
 }
@@ -55,6 +57,7 @@ impl InstanceLaunchOverrides {
             force_fullscreen: None,
             maximize_window: None,
             game_resolution: None,
+            window_title: None,
             launch_preparation_timeout: None,
             hooks: Hooks {
                 pre_launch: None,
@@ -86,6 +89,8 @@ pub(crate) struct InstanceLaunchOverridesData {
     #[serde(default, skip_serializing_if = "Option::is_none")]
     pub game_resolution: Option<WindowSize>,
     #[serde(default, skip_serializing_if = "Option::is_none")]
+    pub window_title: Option<String>,
+    #[serde(default, skip_serializing_if = "Option::is_none")]
     pub launch_preparation_timeout: Option<u64>,
     #[serde(default)]
     pub hooks: Hooks,
@@ -107,6 +112,7 @@ impl InstanceLaunchOverridesData {
             force_fullscreen: self.force_fullscreen,
             maximize_window: self.maximize_window,
             game_resolution: self.game_resolution,
+            window_title: self.window_title,
             launch_preparation_timeout: self.launch_preparation_timeout,
             hooks: self.hooks,
         }
@@ -125,6 +131,7 @@ impl From<&InstanceLaunchOverrides> for InstanceLaunchOverridesData {
             force_fullscreen: overrides.force_fullscreen,
             maximize_window: overrides.maximize_window,
             game_resolution: overrides.game_resolution,
+            window_title: overrides.window_title.clone(),
             launch_preparation_timeout: overrides.launch_preparation_timeout,
             hooks: overrides.hooks.clone(),
         }

packages/app-lib/src/state/legacy_converter.rs

@@ -621,6 +621,7 @@ where
         force_fullscreen: input.force_fullscreen,
         maximize_window: None,
         game_resolution: input.game_resolution,
+        window_title: None,
         launch_preparation_timeout: None,
         hooks: input.hooks,
     };

packages/app-lib/src/state/mod.rs

@@ -26,6 +26,7 @@ pub use self::instance_types::*;
 pub(crate) mod instances;
 pub use self::instances::*;
 
+pub(crate) mod instance_groups;
 mod settings;
 pub use self::settings::*;
 
@@ -487,6 +488,10 @@ impl State {
             .get_or_try_init(move || Self::initialize_state(app_identifier))
             .await?;
 
+        if let Err(e) = instance_groups::ensure_imported(state).await {
+            tracing::error!("Error importing legacy instance groups: {e}");
+        }
+
         if let Err(e) =
             crate::install::recovery::recover_interrupted_jobs(state).await
         {

packages/app-lib/src/state/process.rs

@@ -312,6 +312,7 @@ impl ProcessManager {
         mut mc_command: Command,
         post_exit_command: Option<String>,
         maximize_window: bool,
+        window_title: Option<String>,
         game_dir: PathBuf,
         logs_folder: PathBuf,
         xml_logging: bool,
@@ -336,6 +337,7 @@ impl ProcessManager {
                 uuid: Uuid::new_v4(),
                 pid: mc_proc.id().unwrap_or_default(),
                 maximize_window,
+                window_title: window_title.clone(),
                 start_time: Utc::now(),
                 instance_id: instance_id.to_string(),
                 instance_path: instance_path.to_string(),
@@ -509,6 +511,7 @@ impl ProcessManager {
             metadata.uuid,
             metadata.pid,
             metadata.maximize_window,
+            metadata.window_title.clone(),
             ProcessPayloadType::Launched,
             "Launched Minecraft",
             None,
@@ -586,6 +589,7 @@ pub struct ProcessMetadata {
     pub uuid: Uuid,
     pub pid: u32,
     pub maximize_window: bool,
+    pub window_title: Option<String>,
     pub instance_id: String,
     pub instance_path: String,
     pub instance_name: String,
@@ -1311,6 +1315,7 @@ impl Process {
             uuid,
             pid,
             false,
+            None,
             ProcessPayloadType::Finished,
             "Exited process",
             Some(!mc_exit_status.success() && !manually_killed),
@@ -1451,6 +1456,7 @@ mod post_upgrade_tests {
                     uuid,
                     pid: child.id().unwrap(),
                     maximize_window: false,
+                    window_title: None,
                     instance_id: "first".into(),
                     instance_path: "first".into(),
                     instance_name: "First".into(),

packages/app-lib/src/state/settings.rs

@@ -176,6 +176,10 @@ pub struct Settings {
     pub force_fullscreen: bool,
     pub maximize_window: bool,
     #[serde(default)]
+    pub custom_window_title_enabled: bool,
+    #[serde(default = "default_window_title")]
+    pub default_window_title: String,
+    #[serde(default)]
     pub force_unicode_font: bool,
     pub game_resolution: WindowSize,
     pub hide_on_process_start: bool,
@@ -198,6 +202,10 @@ pub struct Settings {
     pub version: usize,
 }
 
+fn default_window_title() -> String {
+    "Minecraft".to_string()
+}
+
 fn default_true() -> bool {
     true
 }
@@ -328,6 +336,16 @@ impl Settings {
         )
         .fetch_one(exec)
         .await?;
+        let custom_window_title_enabled: bool = sqlx::query_scalar(
+            "SELECT custom_window_title_enabled FROM settings WHERE id = 0",
+        )
+        .fetch_one(exec)
+        .await?;
+        let default_window_title: String = sqlx::query_scalar(
+            "SELECT default_window_title FROM settings WHERE id = 0",
+        )
+        .fetch_one(exec)
+        .await?;
         let settings = Self {
             max_concurrent_downloads: res.max_concurrent_downloads as usize,
             max_concurrent_writes: res.max_concurrent_writes as usize,
@@ -415,6 +433,8 @@ impl Settings {
             },
             force_fullscreen: res.mc_force_fullscreen == 1,
             maximize_window: res.mc_maximize_window == 1,
+            custom_window_title_enabled,
+            default_window_title,
             force_unicode_font: sqlx::query_scalar(
                 "SELECT mc_force_unicode_font FROM settings WHERE id = 0",
             )
@@ -663,6 +683,18 @@ impl Settings {
             .bind(self.ignore_ssl_errors)
             .execute(exec)
             .await?;
+        sqlx::query(
+            "UPDATE settings SET custom_window_title_enabled = ? WHERE id = 0",
+        )
+        .bind(self.custom_window_title_enabled)
+        .execute(exec)
+        .await?;
+        sqlx::query(
+            "UPDATE settings SET default_window_title = ? WHERE id = 0",
+        )
+        .bind(self.default_window_title.trim())
+        .execute(exec)
+        .await?;
         sqlx::query("UPDATE settings SET mc_memory_optimize = ? WHERE id = 0")
             .bind(self.memory.optimize_before_launch)
             .execute(exec)

packages/ui/src/composables/index.ts

@@ -8,6 +8,7 @@ export * from './format-number'
 export * from './how-ago'
 export * from './i18n'
 export * from './i18n-debug'
+export * from './modal-stack'
 export * from './page-leave-safety'
 export * from './scroll-indicator'
 export type { ArmorPreviewConfig } from './skin-rendering/armor-preview-types'

packages/ui/src/locales/en-US/index.json

@@ -4723,5 +4723,143 @@
   },
   "version.supplementary-resources.type": {
     "defaultMessage": "Type"
-  }
+  },
+  "skin.preview.armor.equip-material": {
+      "defaultMessage": "{material} {slot}"
+    },
+  "skin.preview.armor.material": {
+      "defaultMessage": "Armor material"
+    },
+  "skin.preview.armor.material.chainmail": {
+      "defaultMessage": "Chainmail"
+    },
+  "skin.preview.armor.material.copper": {
+      "defaultMessage": "Copper"
+    },
+  "skin.preview.armor.material.diamond": {
+      "defaultMessage": "Diamond"
+    },
+  "skin.preview.armor.material.gold": {
+      "defaultMessage": "Gold"
+    },
+  "skin.preview.armor.material.iron": {
+      "defaultMessage": "Iron"
+    },
+  "skin.preview.armor.material.leather": {
+      "defaultMessage": "Leather"
+    },
+  "skin.preview.armor.material.netherite": {
+      "defaultMessage": "Netherite"
+    },
+  "skin.preview.armor.material.turtle": {
+      "defaultMessage": "Turtle Shell"
+    },
+  "skin.preview.armor.open": {
+      "defaultMessage": "Armor and trims"
+    },
+  "skin.preview.armor.piece": {
+      "defaultMessage": "Armor piece"
+    },
+  "skin.preview.armor.remove-piece": {
+      "defaultMessage": "Remove {slot}"
+    },
+  "skin.preview.armor.remove-trim": {
+      "defaultMessage": "No armor trim"
+    },
+  "skin.preview.armor.slot-state": {
+      "defaultMessage": "{slot}: {state}"
+    },
+  "skin.preview.armor.slot.boots": {
+      "defaultMessage": "Boots"
+    },
+  "skin.preview.armor.slot.chestplate": {
+      "defaultMessage": "Chestplate"
+    },
+  "skin.preview.armor.slot.helmet": {
+      "defaultMessage": "Helmet"
+    },
+  "skin.preview.armor.slot.leggings": {
+      "defaultMessage": "Leggings"
+    },
+  "skin.preview.armor.trim-material": {
+      "defaultMessage": "Trim material"
+    },
+  "skin.preview.armor.trim-material.amethyst": {
+      "defaultMessage": "Amethyst"
+    },
+  "skin.preview.armor.trim-material.emerald": {
+      "defaultMessage": "Emerald"
+    },
+  "skin.preview.armor.trim-material.lapis": {
+      "defaultMessage": "Lapis Lazuli"
+    },
+  "skin.preview.armor.trim-material.quartz": {
+      "defaultMessage": "Quartz"
+    },
+  "skin.preview.armor.trim-material.redstone": {
+      "defaultMessage": "Redstone"
+    },
+  "skin.preview.armor.trim-material.resin": {
+      "defaultMessage": "Resin Brick"
+    },
+  "skin.preview.armor.trim-pattern": {
+      "defaultMessage": "Trim pattern"
+    },
+  "skin.preview.armor.trim.bolt": {
+      "defaultMessage": "Bolt Armor Trim"
+    },
+  "skin.preview.armor.trim.coast": {
+      "defaultMessage": "Coast Armor Trim"
+    },
+  "skin.preview.armor.trim.dune": {
+      "defaultMessage": "Dune Armor Trim"
+    },
+  "skin.preview.armor.trim.eye": {
+      "defaultMessage": "Eye Armor Trim"
+    },
+  "skin.preview.armor.trim.flow": {
+      "defaultMessage": "Flow Armor Trim"
+    },
+  "skin.preview.armor.trim.host": {
+      "defaultMessage": "Host Armor Trim"
+    },
+  "skin.preview.armor.trim.raiser": {
+      "defaultMessage": "Raiser Armor Trim"
+    },
+  "skin.preview.armor.trim.rib": {
+      "defaultMessage": "Rib Armor Trim"
+    },
+  "skin.preview.armor.trim.sentry": {
+      "defaultMessage": "Sentry Armor Trim"
+    },
+  "skin.preview.armor.trim.shaper": {
+      "defaultMessage": "Shaper Armor Trim"
+    },
+  "skin.preview.armor.trim.silence": {
+      "defaultMessage": "Silence Armor Trim"
+    },
+  "skin.preview.armor.trim.snout": {
+      "defaultMessage": "Snout Armor Trim"
+    },
+  "skin.preview.armor.trim.spire": {
+      "defaultMessage": "Spire Armor Trim"
+    },
+  "skin.preview.armor.trim.tide": {
+      "defaultMessage": "Tide Armor Trim"
+    },
+  "skin.preview.armor.trim.vex": {
+      "defaultMessage": "Vex Armor Trim"
+    },
+  "skin.preview.armor.trim.ward": {
+      "defaultMessage": "Ward Armor Trim"
+    },
+  "skin.preview.armor.trim.wayfinder": {
+      "defaultMessage": "Wayfinder Armor Trim"
+    },
+  "skin.preview.armor.trim.wild": {
+      "defaultMessage": "Wild Armor Trim"
+    },
+  "skin.preview.armor.unequipped": {
+      "defaultMessage": "Unequipped"
+    }
 }

packages/ui/src/locales/zh-CN/index.json

@@ -4744,5 +4744,143 @@
   },
   "image-viewer.previous": {
     "defaultMessage": "上一张图像"
-  }
+  },
+  "skin.preview.armor.equip-material": {
+      "message": "为{slot}装备{material}"
+    },
+  "skin.preview.armor.material": {
+      "message": "盔甲材质"
+    },
+  "skin.preview.armor.material.chainmail": {
+      "message": "锁链"
+    },
+  "skin.preview.armor.material.copper": {
+      "message": "铜"
+    },
+  "skin.preview.armor.material.diamond": {
+      "message": "钻石"
+    },
+  "skin.preview.armor.material.gold": {
+      "message": "金"
+    },
+  "skin.preview.armor.material.iron": {
+      "message": "铁"
+    },
+  "skin.preview.armor.material.leather": {
+      "message": "皮革"
+    },
+  "skin.preview.armor.material.netherite": {
+      "message": "下界合金"
+    },
+  "skin.preview.armor.material.turtle": {
+      "message": "海龟壳"
+    },
+  "skin.preview.armor.open": {
+      "message": "盔甲与纹饰"
+    },
+  "skin.preview.armor.piece": {
+      "message": "盔甲部位"
+    },
+  "skin.preview.armor.remove-piece": {
+      "message": "脱下{slot}"
+    },
+  "skin.preview.armor.remove-trim": {
+      "message": "无盔甲纹饰"
+    },
+  "skin.preview.armor.slot-state": {
+      "message": "{slot}：{state}"
+    },
+  "skin.preview.armor.slot.boots": {
+      "message": "靴子"
+    },
+  "skin.preview.armor.slot.chestplate": {
+      "message": "胸甲"
+    },
+  "skin.preview.armor.slot.helmet": {
+      "message": "头盔"
+    },
+  "skin.preview.armor.slot.leggings": {
+      "message": "护腿"
+    },
+  "skin.preview.armor.trim-material": {
+      "message": "纹饰材料"
+    },
+  "skin.preview.armor.trim-material.amethyst": {
+      "message": "紫水晶"
+    },
+  "skin.preview.armor.trim-material.emerald": {
+      "message": "绿宝石"
+    },
+  "skin.preview.armor.trim-material.lapis": {
+      "message": "青金石"
+    },
+  "skin.preview.armor.trim-material.quartz": {
+      "message": "下界石英"
+    },
+  "skin.preview.armor.trim-material.redstone": {
+      "message": "红石"
+    },
+  "skin.preview.armor.trim-material.resin": {
+      "message": "树脂砖"
+    },
+  "skin.preview.armor.trim-pattern": {
+      "message": "纹饰图案"
+    },
+  "skin.preview.armor.trim.bolt": {
+      "message": "镶铆盔甲纹饰"
+    },
+  "skin.preview.armor.trim.coast": {
+      "message": "海岸盔甲纹饰"
+    },
+  "skin.preview.armor.trim.dune": {
+      "message": "沙丘盔甲纹饰"
+    },
+  "skin.preview.armor.trim.eye": {
+      "message": "眼眸盔甲纹饰"
+    },
+  "skin.preview.armor.trim.flow": {
+      "message": "涡流盔甲纹饰"
+    },
+  "skin.preview.armor.trim.host": {
+      "message": "雇主盔甲纹饰"
+    },
+  "skin.preview.armor.trim.raiser": {
+      "message": "牧民盔甲纹饰"
+    },
+  "skin.preview.armor.trim.rib": {
+      "message": "肋骨盔甲纹饰"
+    },
+  "skin.preview.armor.trim.sentry": {
+      "message": "哨兵盔甲纹饰"
+    },
+  "skin.preview.armor.trim.shaper": {
+      "message": "塑造盔甲纹饰"
+    },
+  "skin.preview.armor.trim.silence": {
+      "message": "幽静盔甲纹饰"
+    },
+  "skin.preview.armor.trim.snout": {
+      "message": "猪鼻盔甲纹饰"
+    },
+  "skin.preview.armor.trim.spire": {
+      "message": "尖塔盔甲纹饰"
+    },
+  "skin.preview.armor.trim.tide": {
+      "message": "潮汐盔甲纹饰"
+    },
+  "skin.preview.armor.trim.vex": {
+      "message": "恼鬼盔甲纹饰"
+    },
+  "skin.preview.armor.trim.ward": {
+      "message": "监守盔甲纹饰"
+    },
+  "skin.preview.armor.trim.wayfinder": {
+      "message": "向导盔甲纹饰"
+    },
+  "skin.preview.armor.trim.wild": {
+      "message": "荒野盔甲纹饰"
+    },
+  "skin.preview.armor.unequipped": {
+      "message": "未装备"
+    }
 }