feat: 新增键盘快捷键设置

- 设置页新增「键盘快捷键」分类，可自定义快捷键绑定
- 支持快速滚动（Home/End/PageUp/PageDown）与导航跳转（Ctrl/Cmd+数字）
- 快捷键绑定与开关按动作独立持久化，默认关闭
- 新增 ui 包 keybinding 组件与工具（KeybindingModal/KeybindingChips 等）

apps/app-frontend/src/App.vue

@@ -169,6 +169,7 @@ import { createServerInstall, provideServerInstall } from '@/providers/server-in
 import { setupProviders } from '@/providers/setup'
 import { setupAuthProvider } from '@/providers/setup/auth'
 import { setupLoadingStateProvider } from '@/providers/setup/loading-state'
+import { setupKeyboardShortcuts } from '@/composables/useKeyboardShortcuts'
 import { useError } from '@/store/error.js'
 import { useTheming } from '@/store/state'
 
@@ -184,6 +185,8 @@ const onSchematicWorkshopPage = computed(() => route.path === '/lab/schematic-pr
 const isSchematicFile = (path: string) => /\.(litematic|schematic|schem)$/i.test(path)
 const APP_LEFT_NAV_WIDTH = '4rem'
 
+setupKeyboardShortcuts()
+
 const discoverContentPath = computed(() => {
 	const projectType = route.params.projectType
 	if (

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

@@ -0,0 +1,231 @@
+<script setup lang="ts">
+import {
+	defineMessages,
+	type KeyBinding,
+	KeybindingChips,
+	KeybindingModal,
+	Toggle,
+	useVIntl,
+} from '@modrinth/ui'
+import { computed, ref } from 'vue'
+
+import { getNavShortcutEnabled, setNavShortcutEnabled } from '@/helpers/nav-shortcut-state'
+import { getQuickScrollEnabled, setQuickScrollEnabled } from '@/helpers/scroll-top-state'
+import { NAV_ACTIONS, SCROLL_ACTIONS, type ShortcutAction } from '@/helpers/shortcut-actions'
+import {
+	buildConflicts,
+	clearStoredBinding,
+	resolveAllBindings,
+	storeBinding,
+} from '@/helpers/shortcut-bindings'
+import { useTheming } from '@/store/theme'
+
+import SettingsRow from './SettingsRow.vue'
+import SettingsSection from './SettingsSection.vue'
+
+const { formatMessage } = useVIntl()
+const themeStore = useTheming()
+
+themeStore.quickScrollEnabled = getQuickScrollEnabled()
+themeStore.shortcutBindings = resolveAllBindings()
+for (const action of NAV_ACTIONS) {
+	themeStore[action.enabledField] = getNavShortcutEnabled(action.id)
+}
+
+const messages = defineMessages({
+	scrollTitle: {
+		id: 'app.shortcut-settings.scroll-title',
+		defaultMessage: 'Quick scrolling',
+	},
+	scrollDescription: {
+		id: 'app.shortcut-settings.scroll-description',
+		defaultMessage: 'Move through long pages with the keyboard.',
+	},
+	enable: { id: 'app.shortcut-settings.enable', defaultMessage: 'Enable quick scrolling' },
+	navTitle: {
+		id: 'app.shortcut-settings.nav-title',
+		defaultMessage: 'Navigation shortcuts',
+	},
+	navDescription: {
+		id: 'app.shortcut-settings.nav-description',
+		defaultMessage: 'Jump to a menu item with its shortcut. Each shortcut is off until enabled.',
+	},
+	changeShortcut: {
+		id: 'app.shortcut-settings.change-shortcut',
+		defaultMessage: 'Change the shortcut for {action}',
+	},
+})
+
+function actionLabel(action: ShortcutAction) {
+	return formatMessage(action.label)
+}
+
+function actionDescription(action: ShortcutAction) {
+	return formatMessage(action.description)
+}
+
+function bindingFor(action: ShortcutAction): KeyBinding {
+	return themeStore.shortcutBindings[action.id] ?? action.defaultBinding
+}
+
+function sameBinding(left: KeyBinding, right: KeyBinding) {
+	return (
+		left.device === right.device &&
+		left.code === right.code &&
+		left.mod === right.mod &&
+		left.shift === right.shift &&
+		left.alt === right.alt
+	)
+}
+
+const editing = ref<ShortcutAction | null>(null)
+const keybindingModal = ref<InstanceType<typeof KeybindingModal>>()
+
+const editingLabel = computed(() => (editing.value ? actionLabel(editing.value) : undefined))
+const editingBinding = computed(() => (editing.value ? bindingFor(editing.value) : null))
+const editingDefault = computed(() => editing.value?.defaultBinding ?? null)
+const editingConflicts = computed(() =>
+	editing.value
+		? buildConflicts(editing.value.id, (id) => {
+				const action = [...SCROLL_ACTIONS, ...NAV_ACTIONS].find((candidate) => candidate.id === id)
+				return action ? actionLabel(action) : id
+			})
+		: [],
+)
+
+function openShortcut(action: ShortcutAction) {
+	editing.value = action
+	keybindingModal.value?.show()
+}
+
+function saveShortcut(binding: KeyBinding) {
+	const action = editing.value
+	if (!action) return
+
+	// A combination matching the default is stored as "not changed", so a later
+	// change to the default still reaches this shortcut.
+	if (sameBinding(binding, action.defaultBinding)) clearStoredBinding(action.id)
+	else storeBinding(action.id, binding)
+
+	themeStore.shortcutBindings = { ...themeStore.shortcutBindings, [action.id]: binding }
+}
+
+function toggleQuickScroll(value: unknown) {
+	themeStore.quickScrollEnabled = !!value
+	setQuickScrollEnabled(themeStore.quickScrollEnabled)
+}
+
+function toggleNavShortcut(action: ShortcutAction, value: unknown) {
+	themeStore[action.enabledField] = !!value
+	setNavShortcutEnabled(action.id, !!value)
+}
+</script>
+
+<template>
+	<div class="flex flex-col gap-6">
+		<SettingsSection>
+			<template #header>
+				<h2 class="m-0 text-lg font-semibold text-[var(--color-text-primary)]">
+					{{ formatMessage(messages.scrollTitle) }}
+				</h2>
+				<p class="m-0 mt-1 text-sm leading-relaxed text-[var(--color-text-tertiary)]">
+					{{ formatMessage(messages.scrollDescription) }}
+				</p>
+			</template>
+			<SettingsRow>
+				<template #label>
+					<span id="settings-target-shortcuts-enable" tabindex="-1">
+						{{ formatMessage(messages.enable) }}
+					</span>
+				</template>
+				<template #control>
+					<Toggle
+						id="quick-scroll-enabled"
+						:model-value="themeStore.quickScrollEnabled"
+						@update:model-value="toggleQuickScroll"
+					/>
+				</template>
+			</SettingsRow>
+			<SettingsRow v-for="action in SCROLL_ACTIONS" :key="action.id">
+				<template #label>
+					<span :id="`settings-target-${action.id}`" tabindex="-1">{{ actionLabel(action) }}</span>
+				</template>
+				<template #description>{{ actionDescription(action) }}</template>
+				<template #control>
+					<button
+						type="button"
+						class="keybinding-trigger"
+						:aria-label="formatMessage(messages.changeShortcut, { action: actionLabel(action) })"
+						@click="openShortcut(action)"
+					>
+						<KeybindingChips :binding="bindingFor(action)" />
+					</button>
+				</template>
+			</SettingsRow>
+		</SettingsSection>
+
+		<SettingsSection>
+			<template #header>
+				<h2
+					id="settings-target-shortcuts-nav"
+					tabindex="-1"
+					class="m-0 text-lg font-semibold text-[var(--color-text-primary)]"
+				>
+					{{ formatMessage(messages.navTitle) }}
+				</h2>
+				<p class="m-0 mt-1 text-sm leading-relaxed text-[var(--color-text-tertiary)]">
+					{{ formatMessage(messages.navDescription) }}
+				</p>
+			</template>
+			<SettingsRow v-for="action in NAV_ACTIONS" :key="action.id">
+				<template #label>{{ actionLabel(action) }}</template>
+				<template #description>{{ actionDescription(action) }}</template>
+				<template #control>
+					<div class="flex flex-wrap items-center justify-end gap-3">
+						<button
+							type="button"
+							class="keybinding-trigger"
+							:aria-label="formatMessage(messages.changeShortcut, { action: actionLabel(action) })"
+							@click="openShortcut(action)"
+						>
+							<KeybindingChips :binding="bindingFor(action)" />
+						</button>
+						<Toggle
+							:id="`nav-shortcut-${action.id}`"
+							:model-value="themeStore[action.enabledField]"
+							@update:model-value="(value) => toggleNavShortcut(action, value)"
+						/>
+					</div>
+				</template>
+			</SettingsRow>
+		</SettingsSection>
+
+		<KeybindingModal
+			ref="keybindingModal"
+			:action-label="editingLabel"
+			:binding="editingBinding"
+			:default-binding="editingDefault"
+			:conflicts="editingConflicts"
+			@save="saveShortcut"
+		/>
+	</div>
+</template>
+
+<style scoped>
+.keybinding-trigger {
+	cursor: pointer;
+	border-radius: var(--radius-md);
+	border: 1px solid transparent;
+	background: transparent;
+	padding: 0.25rem 0.375rem;
+	transition:
+		background-color 0.15s ease,
+		border-color 0.15s ease;
+}
+
+.keybinding-trigger:hover,
+.keybinding-trigger:focus-visible {
+	border-color: var(--surface-4);
+	background: var(--surface-3);
+}
+</style>

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

@@ -3,6 +3,7 @@ import type { MessageDescriptor } from '@modrinth/ui'
 export type SettingsCategoryId =
 	| 'interface'
 	| 'home-navigation'
+	| 'shortcut-settings'
 	| 'language-translation'
 	| 'ai'
 	| 'java-performance'
@@ -45,6 +46,15 @@ export const settingsCategoryDefinitions: SettingsCategoryDefinition[] = [
 		group: 'launcher',
 		onboardingId: 'settings-tab-home-navigation',
 	},
+	{
+		id: 'shortcut-settings',
+		name: {
+			id: 'app.settings.tabs.shortcut-settings',
+			defaultMessage: 'Keyboard shortcuts',
+		},
+		group: 'launcher',
+		onboardingId: 'settings-tab-shortcut-settings',
+	},
 	{
 		id: 'language-translation',
 		name: {

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

@@ -7,6 +7,7 @@ import {
 	GameIcon,
 	GaugeIcon,
 	InfoIcon,
+	KeyboardIcon,
 	LanguagesIcon,
 	LayoutTemplateIcon,
 	PaintbrushIcon,
@@ -49,6 +50,10 @@ const categoryContent: Record<SettingsCategoryId, Pick<SettingsCategory, 'icon'
 		icon: LayoutTemplateIcon,
 		content: defineAsyncComponent(() => import('./HomeNavigationSettings.vue')),
 	},
+	'shortcut-settings': {
+		icon: KeyboardIcon,
+		content: defineAsyncComponent(() => import('./KeybindSettings.vue')),
+	},
 	'language-translation': {
 		icon: LanguagesIcon,
 		content: defineAsyncComponent(() => import('./LanguageTranslationSettings.vue')),

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

@@ -0,0 +1,215 @@
+import {
+	type KeyBinding,
+	bindingMatchesKeyboardEvent,
+	bindingMatchesMouseEvent,
+	bindingMatchesWheelEvent,
+	useModalStack,
+} from '@modrinth/ui'
+import { computed, onUnmounted } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+
+import { useNetworkStatus } from '@/composables/useNetworkStatus'
+import {
+	SCROLL_ACTIONS,
+	SHORTCUT_ACTIONS,
+	type ShortcutAction,
+} from '@/helpers/shortcut-actions'
+import { resolveAllBindings } from '@/helpers/shortcut-bindings'
+import { getNavShortcutEnabled } from '@/helpers/nav-shortcut-state'
+import { getQuickScrollEnabled } from '@/helpers/scroll-top-state'
+import { useTheming } from '@/store/theme'
+
+/** Editing surfaces keep these keys for themselves. */
+function isEditableTarget(target: EventTarget | null) {
+	return (
+		target instanceof HTMLInputElement ||
+		target instanceof HTMLTextAreaElement ||
+		target instanceof HTMLSelectElement ||
+		(target instanceof HTMLElement && target.isContentEditable)
+	)
+}
+
+function scrollsAtOwnLevel(element: Element) {
+	const { overflowY } = getComputedStyle(element)
+	return /(auto|scroll|overlay)/.test(overflowY) && element.scrollHeight > element.clientHeight
+}
+
+/** A container that scrolls the page itself rather than a widget on it. */
+function isPageScroller(element: Element) {
+	return scrollsAtOwnLevel(element) && element.clientHeight >= window.innerHeight / 2
+}
+
+/** Nearest scrolling ancestor, whatever its size. */
+function nearestScrollContainer(target: EventTarget | null) {
+	let element = target instanceof Element ? target : null
+	while (element) {
+		if (scrollsAtOwnLevel(element)) return element
+		element = element.parentElement
+	}
+	return null
+}
+
+/**
+ * The page's own scroller. Most pages scroll inside `.app-viewport`, but some
+ * screens (settings, consoles, studios) turn that element's scrolling off and
+ * host a full-height container inside it, so fall back to whatever fills the
+ * middle of the viewport.
+ */
+function resolvePageScroller() {
+	const viewport = document.querySelector<HTMLElement>('.app-viewport')
+	if (!viewport) return null
+	if (isPageScroller(viewport)) return viewport
+
+	const bounds = viewport.getBoundingClientRect()
+	let element: Element | null = document.elementFromPoint(
+		bounds.left + bounds.width / 2,
+		bounds.top + bounds.height / 2,
+	)
+	while (element) {
+		if (isPageScroller(element)) return element
+		element = element.parentElement
+	}
+
+	return viewport
+}
+
+export function setupKeyboardShortcuts() {
+	const themeStore = useTheming()
+	const { hasModal } = useModalStack()
+	const route = useRoute()
+	const router = useRouter()
+	const { offline } = useNetworkStatus()
+
+	themeStore.quickScrollEnabled = getQuickScrollEnabled()
+	for (const shortcut of SHORTCUT_ACTIONS) {
+		if (shortcut.group === 'nav') themeStore[shortcut.enabledField] = getNavShortcutEnabled(shortcut.id)
+	}
+	themeStore.shortcutBindings = resolveAllBindings()
+
+	/** The combination an action answers to now: recorded if there is one, default otherwise. */
+	function bindingFor(action: ShortcutAction): KeyBinding {
+		return themeStore.shortcutBindings[action.id] ?? action.defaultBinding
+	}
+
+	/** Whether an action is switched on and reachable in the current state. */
+	function shortcutIsAvailable(action: ShortcutAction): boolean {
+		if (!themeStore[action.enabledField]) return false
+		return !action.unavailable?.({
+			worldsTabEnabled: themeStore.featureFlags.worlds_tab,
+			offline: offline.value,
+		})
+	}
+
+	function findShortcut<E extends Event>(
+		event: E,
+		matches: (binding: KeyBinding, event: E) => boolean,
+		{ includeDisabled = false }: { includeDisabled?: boolean } = {},
+	): ShortcutAction | null {
+		if (hasModal.value) return null
+		if (isEditableTarget(event.target)) return null
+
+		for (const action of SHORTCUT_ACTIONS) {
+			if (!includeDisabled && !shortcutIsAvailable(action)) continue
+			if (matches(bindingFor(action), event)) return action
+		}
+
+		return null
+	}
+
+	/** Does what an action is for. Scrolling actions move the page's own scroller. */
+	function runShortcut(action: ShortcutAction, event: Event) {
+		if (action.target) {
+			router.push(action.target(route))
+			return
+		}
+
+		const focusedContainer = nearestScrollContainer(event.target)
+		if (focusedContainer && !isPageScroller(focusedContainer)) return
+
+		const scroller = resolvePageScroller()
+		if (!scroller) return
+
+		action.applyScroll?.(scroller)
+	}
+
+	function handleScrollShortcutKey(event: KeyboardEvent) {
+		if (event.isComposing) return
+
+		const match = findShortcut(event, bindingMatchesKeyboardEvent, { includeDisabled: true })
+		if (match?.group !== 'scroll') return
+
+		const focusedContainer = nearestScrollContainer(event.target)
+		if (focusedContainer && !isPageScroller(focusedContainer)) return
+
+		const scroller = resolvePageScroller()
+		if (!scroller) return
+
+		event.preventDefault()
+		if (!shortcutIsAvailable(match)) return
+
+		match.applyScroll?.(scroller)
+	}
+
+	function handleNavShortcutKey(event: KeyboardEvent) {
+		if (event.isComposing) return
+
+		const match = findShortcut(event, bindingMatchesKeyboardEvent)
+		if (match?.group !== 'nav') return
+
+		event.preventDefault()
+		runShortcut(match, event)
+	}
+
+	const hasPointerBindings = computed(() =>
+		SHORTCUT_ACTIONS.some((action) => bindingFor(action).device === 'mouse'),
+	)
+
+	function handleShortcutMouse(event: MouseEvent) {
+		if (!hasPointerBindings.value) return
+
+		const match = findShortcut(event, bindingMatchesMouseEvent)
+		if (!match) return
+
+		event.preventDefault()
+		event.stopPropagation()
+		runShortcut(match, event)
+	}
+
+	function handleShortcutWheel(event: WheelEvent) {
+		if (!hasPointerBindings.value) return
+
+		const match = findShortcut(event, bindingMatchesWheelEvent)
+		if (!match) return
+
+		event.preventDefault()
+		event.stopPropagation()
+		runShortcut(match, event)
+	}
+
+	function handleGlobalKeydown(event: KeyboardEvent) {
+		const key = event.key.toLowerCase()
+		const isFindShortcut = key === 'f' && (event.ctrlKey || event.metaKey)
+		const isBlockedDevtoolsShortcut = event.key === 'F12' && !themeStore.devMode
+
+		if (isFindShortcut || isBlockedDevtoolsShortcut) {
+			event.preventDefault()
+			event.stopPropagation()
+		}
+
+		handleScrollShortcutKey(event)
+		handleNavShortcutKey(event)
+	}
+
+	window.addEventListener('keydown', handleGlobalKeydown, true)
+	window.addEventListener('mousedown', handleShortcutMouse, true)
+	// Not passive: a bound wheel direction has to keep the page from scrolling.
+	window.addEventListener('wheel', handleShortcutWheel, { capture: true, passive: false })
+
+	onUnmounted(() => {
+		window.removeEventListener('keydown', handleGlobalKeydown, true)
+		window.removeEventListener('mousedown', handleShortcutMouse, true)
+		window.removeEventListener('wheel', handleShortcutWheel, { capture: true, passive: false })
+	})
+
+	return { bindingFor, shortcutIsAvailable, SCROLL_ACTIONS }
+}

apps/app-frontend/src/helpers/nav-shortcut-state.ts

@@ -0,0 +1,14 @@
+const NAV_SHORTCUT_STORAGE_PREFIX = 'starlight-shortcut-nav-'
+
+/**
+ * Whether a navigation shortcut is enabled. Shortcuts are off by default;
+ * each one is turned on individually from the Shortcut settings page.
+ */
+export function getNavShortcutEnabled(id: string): boolean {
+	const value = localStorage.getItem(NAV_SHORTCUT_STORAGE_PREFIX + id)
+	return value === 'true'
+}
+
+export function setNavShortcutEnabled(id: string, enabled: boolean) {
+	localStorage.setItem(NAV_SHORTCUT_STORAGE_PREFIX + id, String(enabled))
+}

apps/app-frontend/src/helpers/scroll-top-state.ts

@@ -0,0 +1,20 @@
+const SHOW_SCROLL_TOP_STORAGE_KEY = 'starlight-show-scroll-top'
+const QUICK_SCROLL_ENABLED_STORAGE_KEY = 'starlight-quick-scroll-enabled'
+
+export function getShowScrollTop(): boolean {
+	const value = localStorage.getItem(SHOW_SCROLL_TOP_STORAGE_KEY)
+	return value !== 'false'
+}
+
+export function setShowScrollTop(show: boolean) {
+	localStorage.setItem(SHOW_SCROLL_TOP_STORAGE_KEY, String(show))
+}
+
+export function getQuickScrollEnabled(): boolean {
+	const value = localStorage.getItem(QUICK_SCROLL_ENABLED_STORAGE_KEY)
+	return value === 'true'
+}
+
+export function setQuickScrollEnabled(enabled: boolean) {
+	localStorage.setItem(QUICK_SCROLL_ENABLED_STORAGE_KEY, String(enabled))
+}

apps/app-frontend/src/helpers/shortcut-actions.ts

@@ -0,0 +1,309 @@
+import { defineMessages, type KeyBinding, type MessageDescriptor } from '@modrinth/ui'
+import type { RouteLocationNormalizedLoaded } from 'vue-router'
+
+import { getLastBrowseContentProjectType, isBrowseContentProjectType } from '@/helpers/settings'
+
+/** Which half of the settings page an action belongs to. */
+export type ShortcutGroupId = 'scroll' | 'nav'
+
+/** Theme store fields that switch an action on. */
+export type ShortcutEnabledField =
+	| 'quickScrollEnabled'
+	| 'shortcutNavHome'
+	| 'shortcutNavWorlds'
+	| 'shortcutNavDiscover'
+	| 'shortcutNavSkins'
+	| 'shortcutNavMultiplayer'
+	| 'shortcutNavLibrary'
+	| 'shortcutNavLab'
+	| 'shortcutNavDownloads'
+	| 'shortcutNavCreate'
+	| 'shortcutNavSettings'
+
+export interface ShortcutContext {
+	worldsTabEnabled: boolean
+	offline: boolean
+}
+
+export interface ShortcutAction {
+	/** Stable id, used for the binding, the enable flag and the settings row. */
+	id: string
+	group: ShortcutGroupId
+	enabledField: ShortcutEnabledField
+	defaultBinding: KeyBinding
+	label: MessageDescriptor
+	description: MessageDescriptor
+	/** Navigation actions know where they lead. */
+	target?: (route: RouteLocationNormalizedLoaded) => string
+	/** Navigation actions that are not reachable right now. */
+	unavailable?: (context: ShortcutContext) => boolean
+	/** Scrolling actions move the page's own scroller. */
+	applyScroll?: (scroller: HTMLElement) => void
+}
+
+/**
+ * Declared here rather than assembled from the action ids, so the extractor can
+ * see them; an id built at runtime is one a translation pass would drop.
+ */
+const messages = defineMessages({
+	scrollTop: {
+		id: 'app.shortcut-settings.home-action',
+		defaultMessage: 'Scroll to the top',
+	},
+	scrollTopDescription: {
+		id: 'app.shortcut-settings.home-action-description',
+		defaultMessage: 'Moves the page you are reading to the top.',
+	},
+	scrollBottom: {
+		id: 'app.shortcut-settings.end-action',
+		defaultMessage: 'Scroll to the bottom',
+	},
+	scrollBottomDescription: {
+		id: 'app.shortcut-settings.end-action-description',
+		defaultMessage: 'Moves the page you are reading to the bottom.',
+	},
+	scrollUp: {
+		id: 'app.shortcut-settings.page-up-action',
+		defaultMessage: 'Scroll up one screen',
+	},
+	scrollUpDescription: {
+		id: 'app.shortcut-settings.page-up-action-description',
+		defaultMessage: 'Moves the page you are reading up by one screen.',
+	},
+	scrollDown: {
+		id: 'app.shortcut-settings.page-down-action',
+		defaultMessage: 'Scroll down one screen',
+	},
+	scrollDownDescription: {
+		id: 'app.shortcut-settings.page-down-action-description',
+		defaultMessage: 'Moves the page you are reading down by one screen.',
+	},
+	navHome: { id: 'app.shortcut-settings.nav-home', defaultMessage: 'Home' },
+	navHomeDescription: {
+		id: 'app.shortcut-settings.nav-home-description',
+		defaultMessage: 'Jump to the Home page.',
+	},
+	navWorlds: { id: 'app.shortcut-settings.nav-worlds', defaultMessage: 'Worlds' },
+	navWorldsDescription: {
+		id: 'app.shortcut-settings.nav-worlds-description',
+		defaultMessage: 'Jump to your worlds.',
+	},
+	navDiscover: {
+		id: 'app.shortcut-settings.nav-discover',
+		defaultMessage: 'Discover content',
+	},
+	navDiscoverDescription: {
+		id: 'app.shortcut-settings.nav-discover-description',
+		defaultMessage: 'Jump to browsing content.',
+	},
+	navSkins: { id: 'app.shortcut-settings.nav-skins', defaultMessage: 'Skin selector' },
+	navSkinsDescription: {
+		id: 'app.shortcut-settings.nav-skins-description',
+		defaultMessage: 'Jump to the skin selector.',
+	},
+	navMultiplayer: { id: 'app.shortcut-settings.nav-multiplayer', defaultMessage: 'Multiplayer' },
+	navMultiplayerDescription: {
+		id: 'app.shortcut-settings.nav-multiplayer-description',
+		defaultMessage: 'Jump to multiplayer.',
+	},
+	navLibrary: { id: 'app.shortcut-settings.nav-library', defaultMessage: 'Library' },
+	navLibraryDescription: {
+		id: 'app.shortcut-settings.nav-library-description',
+		defaultMessage: 'Jump to your library.',
+	},
+	navLab: { id: 'app.shortcut-settings.nav-lab', defaultMessage: 'Lab' },
+	navLabDescription: {
+		id: 'app.shortcut-settings.nav-lab-description',
+		defaultMessage: 'Jump to the Lab.',
+	},
+	navDownloads: { id: 'app.shortcut-settings.nav-downloads', defaultMessage: 'Downloads' },
+	navDownloadsDescription: {
+		id: 'app.shortcut-settings.nav-downloads-description',
+		defaultMessage: 'Jump to downloads.',
+	},
+	navCreate: { id: 'app.shortcut-settings.nav-create', defaultMessage: 'Create new instance' },
+	navCreateDescription: {
+		id: 'app.shortcut-settings.nav-create-description',
+		defaultMessage: 'Jump to creating a new instance.',
+	},
+	navSettings: { id: 'app.shortcut-settings.nav-settings', defaultMessage: 'Settings' },
+	navSettingsDescription: {
+		id: 'app.shortcut-settings.nav-settings-description',
+		defaultMessage: 'Jump to the settings.',
+	},
+})
+
+function keyboard(code: string, mod = false, alt = false, shift = false): KeyBinding {
+	return { device: 'keyboard', code, mod, alt, shift }
+}
+
+/**
+ * Resolves the Discover content target from the current route, so the nav
+ * button and the keyboard shortcut share one source of truth.
+ */
+export function discoverContentTarget(route: RouteLocationNormalizedLoaded): string {
+	const projectType = route.params.projectType
+	if (
+		!route.query.i &&
+		!route.query.sid &&
+		!route.query.wid &&
+		typeof projectType === 'string' &&
+		isBrowseContentProjectType(projectType)
+	) {
+		return `/browse/${projectType}`
+	}
+
+	return `/browse/${getLastBrowseContentProjectType()}`
+}
+
+/**
+ * Every shortcut the launcher answers to. The binding here is the one a fresh
+ * install uses; a recorded binding is stored separately and wins over it.
+ */
+export const SHORTCUT_ACTIONS: ShortcutAction[] = [
+	{
+		id: 'shortcutScrollTop',
+		group: 'scroll',
+		enabledField: 'quickScrollEnabled',
+		defaultBinding: keyboard('Home'),
+		label: messages.scrollTop,
+		description: messages.scrollTopDescription,
+		applyScroll: (scroller) => scroller.scrollTo({ top: 0, behavior: 'smooth' }),
+	},
+	{
+		id: 'shortcutScrollBottom',
+		group: 'scroll',
+		enabledField: 'quickScrollEnabled',
+		defaultBinding: keyboard('End'),
+		label: messages.scrollBottom,
+		description: messages.scrollBottomDescription,
+		applyScroll: (scroller) =>
+			scroller.scrollTo({ top: scroller.scrollHeight, behavior: 'smooth' }),
+	},
+	{
+		id: 'shortcutScrollUp',
+		group: 'scroll',
+		enabledField: 'quickScrollEnabled',
+		defaultBinding: keyboard('PageUp'),
+		label: messages.scrollUp,
+		description: messages.scrollUpDescription,
+		applyScroll: (scroller) => {
+			// Immediate scrolling keeps rapid key repeats responsive.
+			scroller.scrollTop = Math.max(0, scroller.scrollTop - scroller.clientHeight * 0.9)
+		},
+	},
+	{
+		id: 'shortcutScrollDown',
+		group: 'scroll',
+		enabledField: 'quickScrollEnabled',
+		defaultBinding: keyboard('PageDown'),
+		label: messages.scrollDown,
+		description: messages.scrollDownDescription,
+		applyScroll: (scroller) => {
+			scroller.scrollTop = Math.min(
+				scroller.scrollHeight,
+				scroller.scrollTop + scroller.clientHeight * 0.9,
+			)
+		},
+	},
+	{
+		id: 'shortcutNavHome',
+		group: 'nav',
+		enabledField: 'shortcutNavHome',
+		defaultBinding: keyboard('Digit1', true),
+		label: messages.navHome,
+		description: messages.navHomeDescription,
+		target: () => '/',
+	},
+	{
+		id: 'shortcutNavWorlds',
+		group: 'nav',
+		enabledField: 'shortcutNavWorlds',
+		defaultBinding: keyboard('Digit2', true),
+		label: messages.navWorlds,
+		description: messages.navWorldsDescription,
+		target: () => '/worlds',
+		unavailable: (context) => !context.worldsTabEnabled,
+	},
+	{
+		id: 'shortcutNavDiscover',
+		group: 'nav',
+		enabledField: 'shortcutNavDiscover',
+		defaultBinding: keyboard('Digit3', true),
+		label: messages.navDiscover,
+		description: messages.navDiscoverDescription,
+		target: (route) => discoverContentTarget(route),
+		unavailable: (context) => context.offline,
+	},
+	{
+		id: 'shortcutNavSkins',
+		group: 'nav',
+		enabledField: 'shortcutNavSkins',
+		defaultBinding: keyboard('Digit4', true),
+		label: messages.navSkins,
+		description: messages.navSkinsDescription,
+		target: () => '/skins',
+	},
+	{
+		id: 'shortcutNavMultiplayer',
+		group: 'nav',
+		enabledField: 'shortcutNavMultiplayer',
+		defaultBinding: keyboard('Digit5', true),
+		label: messages.navMultiplayer,
+		description: messages.navMultiplayerDescription,
+		target: () => '/multiplayer',
+	},
+	{
+		id: 'shortcutNavLibrary',
+		group: 'nav',
+		enabledField: 'shortcutNavLibrary',
+		defaultBinding: keyboard('Digit6', true),
+		label: messages.navLibrary,
+		description: messages.navLibraryDescription,
+		target: () => '/library',
+	},
+	{
+		id: 'shortcutNavLab',
+		group: 'nav',
+		enabledField: 'shortcutNavLab',
+		defaultBinding: keyboard('Digit7', true),
+		label: messages.navLab,
+		description: messages.navLabDescription,
+		target: () => '/lab',
+	},
+	{
+		id: 'shortcutNavDownloads',
+		group: 'nav',
+		enabledField: 'shortcutNavDownloads',
+		defaultBinding: keyboard('Digit8', true),
+		label: messages.navDownloads,
+		description: messages.navDownloadsDescription,
+		target: () => '/downloads',
+	},
+	{
+		id: 'shortcutNavCreate',
+		group: 'nav',
+		enabledField: 'shortcutNavCreate',
+		defaultBinding: keyboard('Digit9', true),
+		label: messages.navCreate,
+		description: messages.navCreateDescription,
+		target: () => '/create',
+		unavailable: (context) => context.offline,
+	},
+	{
+		id: 'shortcutNavSettings',
+		group: 'nav',
+		enabledField: 'shortcutNavSettings',
+		defaultBinding: keyboard('Comma', true),
+		label: messages.navSettings,
+		description: messages.navSettingsDescription,
+		target: () => '/settings',
+	},
+]
+
+export const SCROLL_ACTIONS = SHORTCUT_ACTIONS.filter((action) => action.group === 'scroll')
+export const NAV_ACTIONS = SHORTCUT_ACTIONS.filter((action) => action.group === 'nav')
+
+export function shortcutAction(id: string): ShortcutAction | undefined {
+	return SHORTCUT_ACTIONS.find((action) => action.id === id)
+}

apps/app-frontend/src/helpers/shortcut-bindings.ts

@@ -0,0 +1,120 @@
+import type { BindingConflict, KeyBinding } from '@modrinth/ui'
+
+import { SHORTCUT_ACTIONS, shortcutAction } from '@/helpers/shortcut-actions'
+
+const BINDING_STORAGE_PREFIX = 'starlight-shortcut-binding-'
+
+/**
+ * Combinations the shell or the operating system answers to before the launcher
+ * sees them. Saved shortcuts may not take these over.
+ */
+export const RESERVED_BINDINGS: BindingConflict[] = [
+	{
+		id: 'system-find',
+		label: 'Find in page (Ctrl/Cmd + F)',
+		binding: keyboard('KeyF', true),
+		reserved: true,
+	},
+	{
+		id: 'system-devtools',
+		label: 'Developer tools (F12)',
+		binding: keyboard('F12'),
+		reserved: true,
+	},
+	{
+		id: 'system-close',
+		label: 'Close window (Ctrl/Cmd + W)',
+		binding: keyboard('KeyW', true),
+		reserved: true,
+	},
+	{
+		id: 'system-quit',
+		label: 'Quit (Ctrl/Cmd + Q)',
+		binding: keyboard('KeyQ', true),
+		reserved: true,
+	},
+	{
+		id: 'system-reload',
+		label: 'Reload (Ctrl/Cmd + R)',
+		binding: keyboard('KeyR', true),
+		reserved: true,
+	},
+	{ id: 'system-refresh', label: 'Refresh (F5)', binding: keyboard('F5'), reserved: true },
+	{
+		id: 'system-exit',
+		label: 'Close window (Alt + F4)',
+		binding: keyboard('F4', false, true),
+		reserved: true,
+	},
+]
+
+function keyboard(code: string, mod = false, alt = false, shift = false): KeyBinding {
+	return { device: 'keyboard', code, mod, alt, shift }
+}
+
+function isKeyBinding(value: unknown): value is KeyBinding {
+	if (!value || typeof value !== 'object') return false
+	const candidate = value as Partial<KeyBinding>
+	return (
+		(candidate.device === 'keyboard' || candidate.device === 'mouse') &&
+		typeof candidate.code === 'string' &&
+		candidate.code.length > 0 &&
+		typeof candidate.mod === 'boolean' &&
+		typeof candidate.shift === 'boolean' &&
+		typeof candidate.alt === 'boolean'
+	)
+}
+
+/** The combination recorded for an action, if it has one. */
+export function readStoredBinding(id: string): KeyBinding | null {
+	const raw = localStorage.getItem(BINDING_STORAGE_PREFIX + id)
+	if (!raw) return null
+
+	try {
+		const parsed = JSON.parse(raw)
+		return isKeyBinding(parsed) ? parsed : null
+	} catch {
+		// A value that cannot be read is treated as unset, so the action keeps
+		// working with its default rather than becoming unreachable.
+		return null
+	}
+}
+
+export function storeBinding(id: string, binding: KeyBinding) {
+	localStorage.setItem(BINDING_STORAGE_PREFIX + id, JSON.stringify(binding))
+}
+
+/** Drops the recorded combination, putting the action back on its default. */
+export function clearStoredBinding(id: string) {
+	if (readStoredBinding(id)) localStorage.removeItem(BINDING_STORAGE_PREFIX + id)
+}
+
+/** The combination an action answers to now: the recorded one, or its default. */
+export function resolveBinding(id: string): KeyBinding | null {
+	const action = shortcutAction(id)
+	if (!action) return null
+	return readStoredBinding(id) ?? action.defaultBinding
+}
+
+export function resolveAllBindings(): Record<string, KeyBinding> {
+	const bindings: Record<string, KeyBinding> = {}
+	for (const action of SHORTCUT_ACTIONS) {
+		bindings[action.id] = resolveBinding(action.id) ?? action.defaultBinding
+	}
+	return bindings
+}
+
+/**
+ * Everything a new combination would collide with: the other actions, plus the
+ * combinations the shell owns. `label` is what the dialog names in the error.
+ */
+export function buildConflicts(exceptId: string, label: (id: string) => string): BindingConflict[] {
+	const conflicts = SHORTCUT_ACTIONS.filter((action) => action.id !== exceptId).flatMap(
+		(action) => {
+			const binding = resolveBinding(action.id)
+			return binding ? [{ id: action.id, label: label(action.id), binding }] : []
+		},
+	)
+
+	return [...conflicts, ...RESERVED_BINDINGS]
+}

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

@@ -11600,4 +11600,40 @@
   "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"}}
+  "app.library.selection.remove-from-group": {"message": "Remove from group"},
+  "app.shortcut-settings.change-shortcut": {"message": "Change the shortcut for {action}"},
+  "app.shortcut-settings.enable": {"message": "Enable quick scrolling"},
+  "app.shortcut-settings.end-action": {"message": "Scroll to the bottom"},
+  "app.shortcut-settings.end-action-description": {"message": "Moves the page you are reading to the bottom."},
+  "app.shortcut-settings.home-action": {"message": "Scroll to the top"},
+  "app.shortcut-settings.home-action-description": {"message": "Moves the page you are reading to the top."},
+  "app.shortcut-settings.nav-create": {"message": "Create new instance"},
+  "app.shortcut-settings.nav-create-description": {"message": "Jump to creating a new instance."},
+  "app.shortcut-settings.nav-description": {"message": "Jump to a menu item with its shortcut. Each shortcut is off until enabled."},
+  "app.shortcut-settings.nav-discover": {"message": "Discover content"},
+  "app.shortcut-settings.nav-discover-description": {"message": "Jump to browsing content."},
+  "app.shortcut-settings.nav-downloads": {"message": "Downloads"},
+  "app.shortcut-settings.nav-downloads-description": {"message": "Jump to downloads."},
+  "app.shortcut-settings.nav-home": {"message": "Home"},
+  "app.shortcut-settings.nav-home-description": {"message": "Jump to the Home page."},
+  "app.shortcut-settings.nav-lab": {"message": "Lab"},
+  "app.shortcut-settings.nav-lab-description": {"message": "Jump to the Lab."},
+  "app.shortcut-settings.nav-library": {"message": "Library"},
+  "app.shortcut-settings.nav-library-description": {"message": "Jump to your library."},
+  "app.shortcut-settings.nav-multiplayer": {"message": "Multiplayer"},
+  "app.shortcut-settings.nav-multiplayer-description": {"message": "Jump to multiplayer."},
+  "app.shortcut-settings.nav-settings": {"message": "Settings"},
+  "app.shortcut-settings.nav-settings-description": {"message": "Jump to the settings."},
+  "app.shortcut-settings.nav-skins": {"message": "Skin selector"},
+  "app.shortcut-settings.nav-skins-description": {"message": "Jump to the skin selector."},
+  "app.shortcut-settings.nav-title": {"message": "Navigation shortcuts"},
+  "app.shortcut-settings.nav-worlds": {"message": "Worlds"},
+  "app.shortcut-settings.nav-worlds-description": {"message": "Jump to your worlds."},
+  "app.shortcut-settings.page-down-action": {"message": "Scroll down one screen"},
+  "app.shortcut-settings.page-down-action-description": {"message": "Moves the page you are reading down by one screen."},
+  "app.shortcut-settings.page-up-action": {"message": "Scroll up one screen"},
+  "app.shortcut-settings.page-up-action-description": {"message": "Moves the page you are reading up by one screen."},
+  "app.shortcut-settings.scroll-description": {"message": "Move through long pages with the keyboard."},
+  "app.shortcut-settings.scroll-title": {"message": "Quick scrolling"},
+  "app.settings.tabs.shortcut-settings": {"message": "Keyboard shortcuts"}
+}

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

@@ -11431,4 +11431,40 @@
   "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"}}
+  "app.library.selection.remove-from-group": {"message": "移出分组"},
+  "app.shortcut-settings.change-shortcut": {"message": "更改「{action}」的快捷键"},
+  "app.shortcut-settings.enable": {"message": "启用快捷滚动"},
+  "app.shortcut-settings.end-action": {"message": "滚动到页面底部"},
+  "app.shortcut-settings.end-action-description": {"message": "将当前页面移动到底部。"},
+  "app.shortcut-settings.home-action": {"message": "滚动到页面顶部"},
+  "app.shortcut-settings.home-action-description": {"message": "将当前页面移动到顶部。"},
+  "app.shortcut-settings.nav-create": {"message": "新建实例"},
+  "app.shortcut-settings.nav-create-description": {"message": "前往新建实例。"},
+  "app.shortcut-settings.nav-description": {"message": "使用各自的快捷键跳转到对应菜单项。每个快捷键默认关闭，需逐个启用。"},
+  "app.shortcut-settings.nav-discover": {"message": "发现内容"},
+  "app.shortcut-settings.nav-discover-description": {"message": "前往浏览内容。"},
+  "app.shortcut-settings.nav-downloads": {"message": "下载"},
+  "app.shortcut-settings.nav-downloads-description": {"message": "前往下载。"},
+  "app.shortcut-settings.nav-home": {"message": "首页"},
+  "app.shortcut-settings.nav-home-description": {"message": "前往首页。"},
+  "app.shortcut-settings.nav-lab": {"message": "实验室"},
+  "app.shortcut-settings.nav-lab-description": {"message": "前往实验室。"},
+  "app.shortcut-settings.nav-library": {"message": "内容库"},
+  "app.shortcut-settings.nav-library-description": {"message": "前往内容库。"},
+  "app.shortcut-settings.nav-multiplayer": {"message": "多人游戏"},
+  "app.shortcut-settings.nav-multiplayer-description": {"message": "前往多人游戏。"},
+  "app.shortcut-settings.nav-settings": {"message": "设置"},
+  "app.shortcut-settings.nav-settings-description": {"message": "前往设置。"},
+  "app.shortcut-settings.nav-skins": {"message": "皮肤选择器"},
+  "app.shortcut-settings.nav-skins-description": {"message": "前往皮肤选择器。"},
+  "app.shortcut-settings.nav-title": {"message": "导航快捷键"},
+  "app.shortcut-settings.nav-worlds": {"message": "世界"},
+  "app.shortcut-settings.nav-worlds-description": {"message": "前往你的世界。"},
+  "app.shortcut-settings.page-down-action": {"message": "向下滚动一屏"},
+  "app.shortcut-settings.page-down-action-description": {"message": "将当前页面向下移动一屏。"},
+  "app.shortcut-settings.page-up-action": {"message": "向上滚动一屏"},
+  "app.shortcut-settings.page-up-action-description": {"message": "将当前页面向上移动一屏。"},
+  "app.shortcut-settings.scroll-description": {"message": "使用键盘在长页面中快速滚动。"},
+  "app.shortcut-settings.scroll-title": {"message": "快速滚动"},
+  "app.settings.tabs.shortcut-settings": {"message": "键盘快捷键"}
+}

apps/app-frontend/src/store/theme.ts

@@ -6,6 +6,18 @@ import {
 	resolveFontFamily,
 } from '@/helpers/font-family.ts'
 
+/**
+ * Mirrors `KeyBinding` from `@modrinth/ui`. Declared here so this module stays
+ * loadable without the UI package.
+ */
+export interface ShortcutBinding {
+	device: 'keyboard' | 'mouse'
+	code: string
+	mod: boolean
+	shift: boolean
+	alt: boolean
+}
+
 let systemThemeMq: MediaQueryList | null = null
 
 export const DEFAULT_FEATURE_FLAGS = {
@@ -135,8 +147,30 @@ export type ThemeStore = {
 	minimalHomeInstanceId: string | null
 	closeBehavior: CloseBehavior
 
+	/** Whether the floating "back to top" button is shown on scrollable pages. */
+	showScrollTop: boolean
+	/** Whether quick scrolling shortcuts (Home/End/PageUp/PageDown) are active. */
+	quickScrollEnabled: boolean
+	/** Per-nav-item quick jump shortcuts (Ctrl/Cmd + number), off by default. */
+	shortcutNavHome: boolean
+	shortcutNavWorlds: boolean
+	shortcutNavDiscover: boolean
+	shortcutNavSkins: boolean
+	shortcutNavMultiplayer: boolean
+	shortcutNavLibrary: boolean
+	shortcutNavLab: boolean
+	shortcutNavDownloads: boolean
+	shortcutNavCreate: boolean
+	shortcutNavSettings: boolean
+
+	/**
+	 * The combination every shortcut answers to, keyed by action id. Kept here so
+	 * pages re-render when one is recorded; the value itself lives in local
+	 * storage, next to the enable flags.
+	 */
+	shortcutBindings: Record<string, ShortcutBinding>
+
 	devMode: boolean
-	featureFlags: FeatureFlags
 
 	uiFont: string | null
 	monoFont: string | null
@@ -162,6 +196,22 @@ export const DEFAULT_THEME_STORE: ThemeStore = {
 	minimalHomeInstanceId: null,
 	closeBehavior: 'ask',
 
+	showScrollTop: true,
+	quickScrollEnabled: false,
+
+	shortcutNavHome: false,
+	shortcutNavWorlds: false,
+	shortcutNavDiscover: false,
+	shortcutNavSkins: false,
+	shortcutNavMultiplayer: false,
+	shortcutNavLibrary: false,
+	shortcutNavLab: false,
+	shortcutNavDownloads: false,
+	shortcutNavCreate: false,
+	shortcutNavSettings: false,
+
+	shortcutBindings: {},
+
 	devMode: false,
 	featureFlags: DEFAULT_FEATURE_FLAGS,