feat: add approved modpack sync and StarLight instance modes

apps/app-frontend/src/components/instance/ModManagementSwitch.vue

@@ -0,0 +1,73 @@
+<template>
+	<div
+		class="management-switch relative isolate mb-4 flex w-full max-w-[26rem] rounded-xl bg-surface-1 p-1"
+		:data-packs="selected === 'packs'"
+		role="group"
+		:aria-label="formatMessage(messages.label)"
+	>
+		<span
+			class="selection absolute inset-y-1 left-1 -z-10 w-[calc(50%_-_4px)] rounded-lg bg-surface-3 shadow-sm"
+			aria-hidden="true"
+		/>
+		<button
+			class="flex-1 cursor-pointer border-0 bg-transparent px-4 py-2.5 font-semibold text-base aria-pressed:text-contrast"
+			type="button"
+			:aria-pressed="selected === 'mods'"
+			@click="select('mods')"
+		>
+			{{ formatMessage(messages.mods) }}
+		</button>
+		<button
+			class="flex-1 cursor-pointer border-0 bg-transparent px-4 py-2.5 font-semibold text-base aria-pressed:text-contrast"
+			type="button"
+			:aria-pressed="selected === 'packs'"
+			@click="select('packs')"
+		>
+			{{ formatMessage(messages.packs) }}
+		</button>
+	</div>
+	<div v-show="selected === 'mods'"><slot /></div>
+	<div v-if="openedPacks" v-show="selected === 'packs'"><slot name="packs" /></div>
+</template>
+<script setup lang="ts">
+import { defineMessages, useVIntl } from '@modrinth/ui'
+import { ref } from 'vue'
+const { formatMessage } = useVIntl()
+const messages = defineMessages({
+	label: { id: 'app.hosted-packs.management', defaultMessage: 'Content management' },
+	mods: { id: 'app.hosted-packs.mods', defaultMessage: 'Manage mods' },
+	packs: { id: 'app.hosted-packs.packs', defaultMessage: 'Manage modpacks' },
+})
+const key = 'starlight:instance:mod-management-tab'
+function initial(): 'mods' | 'packs' {
+	try {
+		return localStorage.getItem(key) === 'packs' ? 'packs' : 'mods'
+	} catch {
+		return 'mods'
+	}
+}
+const selected = ref(initial())
+const openedPacks = ref(selected.value === 'packs')
+function select(value: 'mods' | 'packs') {
+	selected.value = value
+	if (value === 'packs') openedPacks.value = true
+	try {
+		localStorage.setItem(key, value)
+	} catch {
+		/* Selection remains usable without storage. */
+	}
+}
+</script>
+<style scoped>
+.selection {
+	transition: transform 420ms cubic-bezier(0.22, 1, 0.36, 1);
+}
+[data-packs='true'] .selection {
+	transform: translateX(100%);
+}
+@media (prefers-reduced-motion: reduce) {
+	.selection {
+		transition: none;
+	}
+}
+</style>