diff --git a/CLAUDE.md b/CLAUDE.md
index 7622abab1..35d10b9cc 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -538,6 +538,11 @@ Logged in:  App → IndexedDB → UI → SyncEngine → mana-sync (Go) → Postg
 | NutriPhi | meals, goals, favorites | Done |
 | Planta | plants, plantPhotos, wateringSchedules, wateringLogs | Done |
 | Storage | files, folders, tags, fileTags | Done |
+| Chat | conversations, messages, templates | Done |
+| Questions | collections, questions, answers | Done |
+| Mukke | songs, playlists, playlistSongs, projects, markers | Done |
+| Context | spaces, documents | Done |
+| Photos | albums, albumItems, favorites, tags, photoTags | Done |
 
 ### Dev Commands (Local-First Stack)
 
diff --git a/apps/chat/apps/web/package.json b/apps/chat/apps/web/package.json
index b834159cd..22c376859 100644
--- a/apps/chat/apps/web/package.json
+++ b/apps/chat/apps/web/package.json
@@ -37,6 +37,7 @@
 		"@manacore/shared-app-onboarding": "workspace:*",
 		"@manacore/shared-auth": "workspace:*",
 		"@manacore/shared-auth-ui": "workspace:*",
+		"@manacore/local-store": "workspace:*",
 		"@manacore/shared-branding": "workspace:*",
 		"@manacore/shared-error-tracking": "workspace:*",
 		"@manacore/shared-feedback-service": "workspace:*",
diff --git a/apps/chat/apps/web/src/lib/data/guest-seed.ts b/apps/chat/apps/web/src/lib/data/guest-seed.ts
new file mode 100644
index 000000000..65b4ff321
--- /dev/null
+++ b/apps/chat/apps/web/src/lib/data/guest-seed.ts
@@ -0,0 +1,30 @@
+/**
+ * Guest seed data for the Chat app.
+ *
+ * Provides a demo conversation to showcase the chat experience.
+ */
+
+import type { LocalConversation, LocalMessage } from './local-store';
+
+const DEMO_CONVERSATION_ID = 'demo-welcome';
+
+export const guestConversations: LocalConversation[] = [
+	{
+		id: DEMO_CONVERSATION_ID,
+		title: 'Willkommen bei Chat!',
+		conversationMode: 'free',
+		documentMode: false,
+		isArchived: false,
+		isPinned: true,
+	},
+];
+
+export const guestMessages: LocalMessage[] = [
+	{
+		id: 'msg-1',
+		conversationId: DEMO_CONVERSATION_ID,
+		sender: 'assistant',
+		messageText:
+			'Hallo! Ich bin dein KI-Assistent. Du kannst mir Fragen stellen, Texte schreiben lassen oder einfach ein Gespräch führen. Melde dich an, um deine Unterhaltungen zu speichern und zu synchronisieren.',
+	},
+];
diff --git a/apps/chat/apps/web/src/lib/data/local-store.ts b/apps/chat/apps/web/src/lib/data/local-store.ts
new file mode 100644
index 000000000..fb9030ecd
--- /dev/null
+++ b/apps/chat/apps/web/src/lib/data/local-store.ts
@@ -0,0 +1,71 @@
+/**
+ * Chat — Local-First Data Layer
+ *
+ * Conversations, messages, and templates stored locally.
+ * LLM streaming and model management remain server-side.
+ */
+
+import { createLocalStore, type BaseRecord } from '@manacore/local-store';
+import { guestConversations, guestMessages } from './guest-seed';
+
+// ─── Types ──────────────────────────────────────────────────
+
+export interface LocalConversation extends BaseRecord {
+	title?: string | null;
+	modelId?: string | null;
+	templateId?: string | null;
+	spaceId?: string | null;
+	conversationMode: 'free' | 'guided' | 'template';
+	documentMode: boolean;
+	isArchived: boolean;
+	isPinned: boolean;
+}
+
+export interface LocalMessage extends BaseRecord {
+	conversationId: string;
+	sender: 'user' | 'assistant' | 'system';
+	messageText: string;
+}
+
+export interface LocalTemplate extends BaseRecord {
+	name: string;
+	description: string;
+	systemPrompt: string;
+	initialQuestion?: string | null;
+	modelId?: string | null;
+	color: string;
+	isDefault: boolean;
+	documentMode: boolean;
+}
+
+// ─── Store ──────────────────────────────────────────────────
+
+const SYNC_SERVER_URL = import.meta.env.PUBLIC_SYNC_SERVER_URL || 'http://localhost:3050';
+
+export const chatStore = createLocalStore({
+	appId: 'chat',
+	collections: [
+		{
+			name: 'conversations',
+			indexes: ['isArchived', 'isPinned', 'spaceId', 'templateId'],
+			guestSeed: guestConversations,
+		},
+		{
+			name: 'messages',
+			indexes: ['conversationId', 'sender', '[conversationId+sender]'],
+			guestSeed: guestMessages,
+		},
+		{
+			name: 'templates',
+			indexes: ['isDefault'],
+		},
+	],
+	sync: {
+		serverUrl: SYNC_SERVER_URL,
+	},
+});
+
+// Typed collection accessors
+export const conversationCollection = chatStore.collection<LocalConversation>('conversations');
+export const messageCollection = chatStore.collection<LocalMessage>('messages');
+export const templateCollection = chatStore.collection<LocalTemplate>('templates');
diff --git a/apps/chat/apps/web/src/routes/(protected)/+layout.svelte b/apps/chat/apps/web/src/routes/(protected)/+layout.svelte
index e8c8556a8..809603e8d 100644
--- a/apps/chat/apps/web/src/routes/(protected)/+layout.svelte
+++ b/apps/chat/apps/web/src/routes/(protected)/+layout.svelte
@@ -24,7 +24,9 @@
 	import type { LayoutData } from './$types';
 	import { chatOnboarding } from '$lib/stores/app-onboarding.svelte';
 	import { MiniOnboardingModal } from '@manacore/shared-app-onboarding';
-	import { SessionExpiredBanner, AuthGate } from '@manacore/shared-auth-ui';
+	import { SessionExpiredBanner, AuthGate, GuestWelcomeModal } from '@manacore/shared-auth-ui';
+	import { shouldShowGuestWelcome } from '@manacore/shared-auth-ui';
+	import { chatStore } from '$lib/data/local-store';
 
 	// App switcher items
 	const appItems = getPillAppItems('chat');
@@ -156,7 +158,18 @@
 		goto('/login');
 	}
 
+	let showGuestWelcome = $state(false);
+
 	async function handleAuthReady() {
+		// Initialize local-first database
+		await chatStore.initialize();
+		if (authStore.isAuthenticated) {
+			chatStore.startSync(() => authStore.getValidToken());
+		}
+		if (!authStore.isAuthenticated && shouldShowGuestWelcome('chat')) {
+			showGuestWelcome = true;
+		}
+
 		// Initialize theme
 		theme.initialize();
 
@@ -167,6 +180,8 @@
 			collapsedStore.set(true);
 		}
 
+		if (!authStore.isAuthenticated) return;
+
 		// Load user settings and tags
 		await userSettings.load();
 		await tagStore.fetchTags();
@@ -186,7 +201,7 @@
 
 <svelte:window onkeydown={handleKeydown} />
 
-<AuthGate {authStore} {goto} onReady={handleAuthReady}>
+<AuthGate {authStore} {goto} allowGuest={true} onReady={handleAuthReady}>
 	<!-- Navigation Layout -->
 	<div class="layout-container">
 		<!-- Floating Pill Navigation -->
@@ -256,7 +271,18 @@
 		<MiniOnboardingModal store={chatOnboarding} appName="Chat" appEmoji="💬" />
 	{/if}
 
-	<SessionExpiredBanner locale={$locale || 'de'} loginHref="/login" />
+	{#if authStore.isAuthenticated}
+		<SessionExpiredBanner locale={$locale || 'de'} loginHref="/login" />
+	{/if}
+
+	<GuestWelcomeModal
+		appId="chat"
+		visible={showGuestWelcome}
+		onClose={() => (showGuestWelcome = false)}
+		onLogin={() => goto('/login')}
+		onRegister={() => goto('/register')}
+		locale={($locale || 'de') === 'de' ? 'de' : 'en'}
+	/>
 </AuthGate>
 
 <style>
diff --git a/apps/context/apps/web/package.json b/apps/context/apps/web/package.json
index 2a3b57133..dab0ae76c 100644
--- a/apps/context/apps/web/package.json
+++ b/apps/context/apps/web/package.json
@@ -36,6 +36,7 @@
 		"@manacore/shared-app-onboarding": "workspace:*",
 		"@manacore/shared-auth": "workspace:*",
 		"@manacore/shared-auth-ui": "workspace:*",
+		"@manacore/local-store": "workspace:*",
 		"@manacore/shared-branding": "workspace:*",
 		"@manacore/shared-error-tracking": "workspace:*",
 		"@manacore/shared-feedback-service": "workspace:*",
diff --git a/apps/context/apps/web/src/lib/data/guest-seed.ts b/apps/context/apps/web/src/lib/data/guest-seed.ts
new file mode 100644
index 000000000..f74317dcd
--- /dev/null
+++ b/apps/context/apps/web/src/lib/data/guest-seed.ts
@@ -0,0 +1,43 @@
+/**
+ * Guest seed data for the Context app.
+ *
+ * Provides a demo space with sample documents.
+ */
+
+import type { LocalSpace, LocalDocument } from './local-store';
+
+const DEMO_SPACE_ID = 'demo-workspace';
+
+export const guestSpaces: LocalSpace[] = [
+	{
+		id: DEMO_SPACE_ID,
+		name: 'Mein Workspace',
+		description: 'Beispiel-Space zum Kennenlernen von Context.',
+		pinned: true,
+		prefix: 'W',
+	},
+];
+
+export const guestDocuments: LocalDocument[] = [
+	{
+		id: 'doc-welcome',
+		spaceId: DEMO_SPACE_ID,
+		title: 'Willkommen bei Context',
+		content:
+			'Context ist dein KI-gestütztes Dokumenten-Management. Erstelle Texte, sammle Kontexte und nutze KI-Prompts.\n\nMelde dich an, um deine Dokumente zu synchronisieren.',
+		type: 'text',
+		shortId: 'WD1',
+		pinned: true,
+		metadata: { tags: ['einführung'], wordCount: 22 },
+	},
+	{
+		id: 'doc-prompt',
+		spaceId: DEMO_SPACE_ID,
+		title: 'Beispiel-Prompt',
+		content: 'Fasse den folgenden Text in 3 Stichpunkten zusammen:\n\n{text}',
+		type: 'prompt',
+		shortId: 'WP1',
+		pinned: false,
+		metadata: { tags: ['vorlage'] },
+	},
+];
diff --git a/apps/context/apps/web/src/lib/data/local-store.ts b/apps/context/apps/web/src/lib/data/local-store.ts
new file mode 100644
index 000000000..8017b12b6
--- /dev/null
+++ b/apps/context/apps/web/src/lib/data/local-store.ts
@@ -0,0 +1,59 @@
+/**
+ * Context — Local-First Data Layer
+ *
+ * Spaces and documents stored locally.
+ * AI generation and token management remain server-side.
+ */
+
+import { createLocalStore, type BaseRecord } from '@manacore/local-store';
+import { guestSpaces, guestDocuments } from './guest-seed';
+
+// ─── Types ──────────────────────────────────────────────────
+
+export interface LocalSpace extends BaseRecord {
+	name: string;
+	description?: string | null;
+	settings?: Record<string, unknown> | null;
+	pinned: boolean;
+	prefix: string;
+}
+
+export interface LocalDocument extends BaseRecord {
+	spaceId?: string | null;
+	title: string;
+	content: string;
+	type: 'text' | 'context' | 'prompt';
+	shortId?: string | null;
+	pinned: boolean;
+	metadata?: {
+		tags?: string[];
+		wordCount?: number;
+	} | null;
+}
+
+// ─── Store ──────────────────────────────────────────────────
+
+const SYNC_SERVER_URL = import.meta.env.PUBLIC_SYNC_SERVER_URL || 'http://localhost:3050';
+
+export const contextStore = createLocalStore({
+	appId: 'context',
+	collections: [
+		{
+			name: 'spaces',
+			indexes: ['pinned', 'prefix'],
+			guestSeed: guestSpaces,
+		},
+		{
+			name: 'documents',
+			indexes: ['spaceId', 'type', 'pinned', 'title', '[spaceId+type]'],
+			guestSeed: guestDocuments,
+		},
+	],
+	sync: {
+		serverUrl: SYNC_SERVER_URL,
+	},
+});
+
+// Typed collection accessors
+export const spaceCollection = contextStore.collection<LocalSpace>('spaces');
+export const documentCollection = contextStore.collection<LocalDocument>('documents');
diff --git a/apps/context/apps/web/src/routes/(app)/+layout.svelte b/apps/context/apps/web/src/routes/(app)/+layout.svelte
index 531c6ea42..56272aa1e 100644
--- a/apps/context/apps/web/src/routes/(app)/+layout.svelte
+++ b/apps/context/apps/web/src/routes/(app)/+layout.svelte
@@ -28,6 +28,9 @@
 	import { setLocale, supportedLocales } from '$lib/i18n';
 	import { contextOnboarding } from '$lib/stores/app-onboarding.svelte';
 	import { MiniOnboardingModal } from '@manacore/shared-app-onboarding';
+	import { AuthGate, GuestWelcomeModal } from '@manacore/shared-auth-ui';
+	import { shouldShowGuestWelcome } from '@manacore/shared-auth-ui';
+	import { contextStore } from '$lib/data/local-store';
 	import { tagStore } from '$lib/stores/tags.svelte';
 
 	const appItems = getPillAppItems('context');
@@ -212,11 +215,15 @@
 		goto('/login');
 	}
 
-	onMount(async () => {
-		await authStore.initialize();
-		if (!authStore.isAuthenticated) {
-			goto('/login');
-			return;
+	let showGuestWelcome = $state(false);
+
+	async function handleAuthReady() {
+		await contextStore.initialize();
+		if (authStore.isAuthenticated) {
+			contextStore.startSync(() => authStore.getValidToken());
+		}
+		if (!authStore.isAuthenticated && shouldShowGuestWelcome('context')) {
+			showGuestWelcome = true;
 		}
 
 		const savedCollapsed = localStorage.getItem('context-nav-collapsed');
@@ -225,90 +232,99 @@
 			collapsedStore.set(true);
 		}
 
-		await userSettings.load();
-
-		// Load tags
-		await tagStore.fetchTags();
-
-		// Pre-load data for CommandBar search
-		await Promise.all([spacesStore.load(), documentsStore.load()]);
-	});
+		if (authStore.isAuthenticated) {
+			await userSettings.load();
+			await tagStore.fetchTags();
+			await Promise.all([spacesStore.load(), documentsStore.load()]);
+		}
+	}
 </script>
 
 <svelte:window onkeydown={handleKeydown} />
 
-<div class="layout-container">
-	<PillNavigation
-		items={navItems}
-		currentPath={$page.url.pathname}
-		appName="Context"
-		homeRoute="/"
-		onToggleTheme={handleToggleTheme}
-		{isDark}
-		{isCollapsed}
-		onCollapsedChange={handleCollapsedChange}
-		showThemeToggle={true}
-		showThemeVariants={true}
-		{themeVariantItems}
-		{currentThemeVariantLabel}
-		themeMode={theme.mode}
-		onThemeModeChange={handleThemeModeChange}
-		showLanguageSwitcher={true}
-		{languageItems}
-		{currentLanguageLabel}
-		showLogout={true}
-		onLogout={handleLogout}
-		loginHref="/login"
-		primaryColor="#0ea5e9"
-		showAppSwitcher={true}
-		{appItems}
-		{userEmail}
-		settingsHref="/settings"
-		manaHref="/mana"
-		profileHref="/profile"
-		themesHref="/themes"
-		helpHref="/help"
-		allAppsHref="/apps"
-	/>
-
-	<!-- TagStrip (above PillNav, toggled via Tags pill) -->
-	{#if isTagStripVisible}
-		<TagStrip
-			tags={tagStore.tags.map((t) => ({
-				id: t.id,
-				name: t.name,
-				color: t.color || '#3b82f6',
-			}))}
-			selectedIds={[]}
-			onToggle={() => {}}
-			onClear={() => {}}
-			managementHref="/tags"
-			loading={tagStore.loading}
+<AuthGate {authStore} {goto} allowGuest={true} onReady={handleAuthReady}>
+	<div class="layout-container">
+		<PillNavigation
+			items={navItems}
+			currentPath={$page.url.pathname}
+			appName="Context"
+			homeRoute="/"
+			onToggleTheme={handleToggleTheme}
+			{isDark}
+			{isCollapsed}
+			onCollapsedChange={handleCollapsedChange}
+			showThemeToggle={true}
+			showThemeVariants={true}
+			{themeVariantItems}
+			{currentThemeVariantLabel}
+			themeMode={theme.mode}
+			onThemeModeChange={handleThemeModeChange}
+			showLanguageSwitcher={true}
+			{languageItems}
+			{currentLanguageLabel}
+			showLogout={true}
+			onLogout={handleLogout}
+			loginHref="/login"
+			primaryColor="#0ea5e9"
+			showAppSwitcher={true}
+			{appItems}
+			{userEmail}
+			settingsHref="/settings"
+			manaHref="/mana"
+			profileHref="/profile"
+			themesHref="/themes"
+			helpHref="/help"
+			allAppsHref="/apps"
 		/>
+
+		<!-- TagStrip (above PillNav, toggled via Tags pill) -->
+		{#if isTagStripVisible}
+			<TagStrip
+				tags={tagStore.tags.map((t) => ({
+					id: t.id,
+					name: t.name,
+					color: t.color || '#3b82f6',
+				}))}
+				selectedIds={[]}
+				onToggle={() => {}}
+				onClear={() => {}}
+				managementHref="/tags"
+				loading={tagStore.loading}
+			/>
+		{/if}
+
+		<main class="main-content bg-background">
+			<div class="content-wrapper">
+				{@render children()}
+			</div>
+		</main>
+
+		<CommandBar
+			bind:open={commandBarOpen}
+			onClose={() => (commandBarOpen = false)}
+			onSearch={handleCommandBarSearch}
+			onSelect={handleCommandBarSelect}
+			quickActions={commandBarQuickActions}
+			placeholder="Schnellzugriff..."
+			emptyText="Keine Ergebnisse"
+			searchingText="Suche..."
+		/>
+	</div>
+
+	<!-- Onboarding Modal -->
+	{#if contextOnboarding.shouldShow}
+		<MiniOnboardingModal store={contextOnboarding} appName="Context" appEmoji="📄" />
 	{/if}
 
-	<main class="main-content bg-background">
-		<div class="content-wrapper">
-			{@render children()}
-		</div>
-	</main>
-
-	<CommandBar
-		bind:open={commandBarOpen}
-		onClose={() => (commandBarOpen = false)}
-		onSearch={handleCommandBarSearch}
-		onSelect={handleCommandBarSelect}
-		quickActions={commandBarQuickActions}
-		placeholder="Schnellzugriff..."
-		emptyText="Keine Ergebnisse"
-		searchingText="Suche..."
+	<GuestWelcomeModal
+		appId="context"
+		visible={showGuestWelcome}
+		onClose={() => (showGuestWelcome = false)}
+		onLogin={() => goto('/login')}
+		onRegister={() => goto('/register')}
+		locale={($locale || 'de') === 'de' ? 'de' : 'en'}
 	/>
-</div>
-
-<!-- Onboarding Modal -->
-{#if contextOnboarding.shouldShow}
-	<MiniOnboardingModal store={contextOnboarding} appName="Context" appEmoji="📄" />
-{/if}
+</AuthGate>
 
 <style>
 	.layout-container {
diff --git a/apps/mukke/apps/web/package.json b/apps/mukke/apps/web/package.json
index 1ae67a09b..5d796b8f6 100644
--- a/apps/mukke/apps/web/package.json
+++ b/apps/mukke/apps/web/package.json
@@ -39,6 +39,7 @@
 		"@manacore/shared-api-client": "workspace:*",
 		"@manacore/shared-auth": "workspace:*",
 		"@manacore/shared-auth-ui": "workspace:*",
+		"@manacore/local-store": "workspace:*",
 		"@manacore/shared-branding": "workspace:*",
 		"@manacore/shared-error-tracking": "workspace:*",
 		"@manacore/shared-feedback-service": "workspace:^",
diff --git a/apps/mukke/apps/web/src/lib/data/guest-seed.ts b/apps/mukke/apps/web/src/lib/data/guest-seed.ts
new file mode 100644
index 000000000..cde8d93ec
--- /dev/null
+++ b/apps/mukke/apps/web/src/lib/data/guest-seed.ts
@@ -0,0 +1,15 @@
+/**
+ * Guest seed data for the Mukke app.
+ *
+ * Provides a demo playlist. Songs require upload, so no audio seeds.
+ */
+
+import type { LocalPlaylist } from './local-store';
+
+export const guestPlaylists: LocalPlaylist[] = [
+	{
+		id: 'playlist-favorites',
+		name: 'Meine Favoriten',
+		description: 'Lade Songs hoch und füge sie zu dieser Playlist hinzu.',
+	},
+];
diff --git a/apps/mukke/apps/web/src/lib/data/local-store.ts b/apps/mukke/apps/web/src/lib/data/local-store.ts
new file mode 100644
index 000000000..3986e5392
--- /dev/null
+++ b/apps/mukke/apps/web/src/lib/data/local-store.ts
@@ -0,0 +1,98 @@
+/**
+ * Mukke — Local-First Data Layer
+ *
+ * Song metadata, playlists, projects, and markers stored locally.
+ * Audio file upload/streaming remains server-side.
+ */
+
+import { createLocalStore, type BaseRecord } from '@manacore/local-store';
+import { guestPlaylists } from './guest-seed';
+
+// ─── Types ──────────────────────────────────────────────────
+
+export interface LocalSong extends BaseRecord {
+	title: string;
+	artist?: string | null;
+	album?: string | null;
+	albumArtist?: string | null;
+	genre?: string | null;
+	trackNumber?: number | null;
+	year?: number | null;
+	duration?: number | null;
+	storagePath: string;
+	coverArtPath?: string | null;
+	fileSize?: number | null;
+	bpm?: number | null;
+	favorite: boolean;
+	playCount: number;
+	lastPlayedAt?: string | null;
+}
+
+export interface LocalPlaylist extends BaseRecord {
+	name: string;
+	description?: string | null;
+	coverArtPath?: string | null;
+}
+
+export interface LocalPlaylistSong extends BaseRecord {
+	playlistId: string;
+	songId: string;
+	sortOrder: number;
+}
+
+export interface LocalProject extends BaseRecord {
+	title: string;
+	description?: string | null;
+	songId?: string | null;
+}
+
+export interface LocalMarker extends BaseRecord {
+	beatId: string;
+	type: 'verse' | 'hook' | 'bridge' | 'intro' | 'outro' | 'drop' | 'breakdown' | 'custom';
+	label?: string | null;
+	startTime: number;
+	endTime?: number | null;
+	color?: string | null;
+	sortOrder: number;
+}
+
+// ─── Store ──────────────────────────────────────────────────
+
+const SYNC_SERVER_URL = import.meta.env.PUBLIC_SYNC_SERVER_URL || 'http://localhost:3050';
+
+export const mukkeStore = createLocalStore({
+	appId: 'mukke',
+	collections: [
+		{
+			name: 'songs',
+			indexes: ['artist', 'album', 'genre', 'favorite', 'title'],
+		},
+		{
+			name: 'playlists',
+			indexes: ['name'],
+			guestSeed: guestPlaylists,
+		},
+		{
+			name: 'playlistSongs',
+			indexes: ['playlistId', 'songId', 'sortOrder', '[playlistId+sortOrder]'],
+		},
+		{
+			name: 'projects',
+			indexes: ['title', 'songId'],
+		},
+		{
+			name: 'markers',
+			indexes: ['beatId', 'type', 'sortOrder'],
+		},
+	],
+	sync: {
+		serverUrl: SYNC_SERVER_URL,
+	},
+});
+
+// Typed collection accessors
+export const songCollection = mukkeStore.collection<LocalSong>('songs');
+export const playlistCollection = mukkeStore.collection<LocalPlaylist>('playlists');
+export const playlistSongCollection = mukkeStore.collection<LocalPlaylistSong>('playlistSongs');
+export const projectCollection = mukkeStore.collection<LocalProject>('projects');
+export const markerCollection = mukkeStore.collection<LocalMarker>('markers');
diff --git a/apps/mukke/apps/web/src/routes/(app)/+layout.svelte b/apps/mukke/apps/web/src/routes/(app)/+layout.svelte
index 981fb24b4..ce9c30011 100644
--- a/apps/mukke/apps/web/src/routes/(app)/+layout.svelte
+++ b/apps/mukke/apps/web/src/routes/(app)/+layout.svelte
@@ -26,7 +26,9 @@
 	import { playlistStore } from '$lib/stores/playlist.svelte';
 	import { projectStore } from '$lib/stores/project.svelte';
 	import { parseSongInput, formatParsedSongPreview } from '$lib/utils/song-parser';
-	import { SessionExpiredBanner, AuthGate } from '@manacore/shared-auth-ui';
+	import { SessionExpiredBanner, AuthGate, GuestWelcomeModal } from '@manacore/shared-auth-ui';
+	import { shouldShowGuestWelcome } from '@manacore/shared-auth-ui';
+	import { mukkeStore } from '$lib/data/local-store';
 	import { tagStore } from '$lib/stores/tags.svelte';
 	import MiniPlayer from '$lib/components/MiniPlayer.svelte';
 	import FullPlayer from '$lib/components/FullPlayer.svelte';
@@ -180,15 +182,26 @@
 		goto('/projects');
 	}
 
+	let showGuestWelcome = $state(false);
+
 	async function handleAuthReady() {
+		await mukkeStore.initialize();
+		if (authStore.isAuthenticated) {
+			mukkeStore.startSync(() => authStore.getValidToken());
+		}
+		if (!authStore.isAuthenticated && shouldShowGuestWelcome('mukke')) {
+			showGuestWelcome = true;
+		}
 		splitPanel.initialize();
-		await tagStore.fetchTags();
+		if (authStore.isAuthenticated) {
+			await tagStore.fetchTags();
+		}
 	}
 </script>
 
 <svelte:window onkeydown={handleKeydown} />
 
-<AuthGate {authStore} {goto} onReady={handleAuthReady}>
+<AuthGate {authStore} {goto} allowGuest={true} onReady={handleAuthReady}>
 	<SplitPaneContainer>
 		<div class="layout-container">
 			<a
@@ -272,7 +285,18 @@
 			<DevBuildBadge commitHash={__BUILD_HASH__} buildTime={__BUILD_TIME__} />
 		</div>
 	</SplitPaneContainer>
-	<SessionExpiredBanner locale="de" loginHref="/login" />
+	{#if authStore.isAuthenticated}
+		<SessionExpiredBanner locale="de" loginHref="/login" />
+	{/if}
+
+	<GuestWelcomeModal
+		appId="mukke"
+		visible={showGuestWelcome}
+		onClose={() => (showGuestWelcome = false)}
+		onLogin={() => goto('/login')}
+		onRegister={() => goto('/register')}
+		locale="de"
+	/>
 </AuthGate>
 
 <style>
diff --git a/apps/photos/apps/web/package.json b/apps/photos/apps/web/package.json
index 32c5c92ef..b045a5a95 100644
--- a/apps/photos/apps/web/package.json
+++ b/apps/photos/apps/web/package.json
@@ -33,6 +33,7 @@
 		"@manacore/shared-api-client": "workspace:*",
 		"@manacore/shared-auth": "workspace:*",
 		"@manacore/shared-auth-ui": "workspace:*",
+		"@manacore/local-store": "workspace:*",
 		"@manacore/shared-branding": "workspace:*",
 		"@manacore/shared-error-tracking": "workspace:*",
 		"@manacore/shared-feedback-service": "workspace:*",
diff --git a/apps/photos/apps/web/src/lib/data/guest-seed.ts b/apps/photos/apps/web/src/lib/data/guest-seed.ts
new file mode 100644
index 000000000..eb4ba613a
--- /dev/null
+++ b/apps/photos/apps/web/src/lib/data/guest-seed.ts
@@ -0,0 +1,34 @@
+/**
+ * Guest seed data for the Photos app.
+ *
+ * Provides demo albums and tags. Actual photos require mana-media.
+ */
+
+import type { LocalAlbum, LocalTag } from './local-store';
+
+export const guestAlbums: LocalAlbum[] = [
+	{
+		id: 'album-favorites',
+		name: 'Favoriten',
+		description: 'Deine Lieblingsfotos an einem Ort.',
+		isAutoGenerated: false,
+	},
+];
+
+export const guestTags: LocalTag[] = [
+	{
+		id: 'tag-nature',
+		name: 'Natur',
+		color: '#22c55e',
+	},
+	{
+		id: 'tag-people',
+		name: 'Menschen',
+		color: '#3b82f6',
+	},
+	{
+		id: 'tag-travel',
+		name: 'Reisen',
+		color: '#f59e0b',
+	},
+];
diff --git a/apps/photos/apps/web/src/lib/data/local-store.ts b/apps/photos/apps/web/src/lib/data/local-store.ts
new file mode 100644
index 000000000..8e4b70111
--- /dev/null
+++ b/apps/photos/apps/web/src/lib/data/local-store.ts
@@ -0,0 +1,82 @@
+/**
+ * Photos — Local-First Data Layer
+ *
+ * Albums, favorites, and tags stored locally.
+ * Photo files remain on mana-media (server-side).
+ */
+
+import { createLocalStore, type BaseRecord } from '@manacore/local-store';
+import { guestAlbums, guestTags } from './guest-seed';
+
+// ─── Types ──────────────────────────────────────────────────
+
+export interface LocalAlbum extends BaseRecord {
+	name: string;
+	description?: string | null;
+	coverMediaId?: string | null;
+	isAutoGenerated: boolean;
+	autoGenerateType?: 'date' | 'location' | 'camera' | null;
+	autoGenerateValue?: string | null;
+}
+
+export interface LocalAlbumItem extends BaseRecord {
+	albumId: string;
+	mediaId: string;
+	sortOrder: number;
+}
+
+export interface LocalFavorite extends BaseRecord {
+	mediaId: string;
+}
+
+export interface LocalTag extends BaseRecord {
+	name: string;
+	color?: string | null;
+}
+
+export interface LocalPhotoTag extends BaseRecord {
+	mediaId: string;
+	tagId: string;
+}
+
+// ─── Store ──────────────────────────────────────────────────
+
+const SYNC_SERVER_URL = import.meta.env.PUBLIC_SYNC_SERVER_URL || 'http://localhost:3050';
+
+export const photosStore = createLocalStore({
+	appId: 'photos',
+	collections: [
+		{
+			name: 'albums',
+			indexes: ['isAutoGenerated', 'name'],
+			guestSeed: guestAlbums,
+		},
+		{
+			name: 'albumItems',
+			indexes: ['albumId', 'mediaId', 'sortOrder', '[albumId+sortOrder]'],
+		},
+		{
+			name: 'favorites',
+			indexes: ['mediaId'],
+		},
+		{
+			name: 'tags',
+			indexes: ['name'],
+			guestSeed: guestTags,
+		},
+		{
+			name: 'photoTags',
+			indexes: ['mediaId', 'tagId', '[mediaId+tagId]'],
+		},
+	],
+	sync: {
+		serverUrl: SYNC_SERVER_URL,
+	},
+});
+
+// Typed collection accessors
+export const albumCollection = photosStore.collection<LocalAlbum>('albums');
+export const albumItemCollection = photosStore.collection<LocalAlbumItem>('albumItems');
+export const favoriteCollection = photosStore.collection<LocalFavorite>('favorites');
+export const tagCollection = photosStore.collection<LocalTag>('tags');
+export const photoTagCollection = photosStore.collection<LocalPhotoTag>('photoTags');
diff --git a/apps/photos/apps/web/src/routes/(app)/+layout.svelte b/apps/photos/apps/web/src/routes/(app)/+layout.svelte
index a80d91438..e20f53f94 100644
--- a/apps/photos/apps/web/src/routes/(app)/+layout.svelte
+++ b/apps/photos/apps/web/src/routes/(app)/+layout.svelte
@@ -11,7 +11,9 @@
 	import { tagStore } from '$lib/stores/tags.svelte';
 	import { THEME_DEFINITIONS, DEFAULT_THEME_VARIANTS } from '@manacore/shared-theme';
 	import type { ThemeVariant } from '@manacore/shared-theme';
-	import { SessionExpiredBanner, AuthGate } from '@manacore/shared-auth-ui';
+	import { SessionExpiredBanner, AuthGate, GuestWelcomeModal } from '@manacore/shared-auth-ui';
+	import { shouldShowGuestWelcome } from '@manacore/shared-auth-ui';
+	import { photosStore } from '$lib/data/local-store';
 
 	let { children } = $props();
 
@@ -106,12 +108,21 @@
 		}
 	}
 
+	let showGuestWelcome = $state(false);
+
 	async function handleAuthReady() {
-		await Promise.all([photoStore.loadStats(), albumStore.loadAlbums(), tagStore.loadTags()]);
+		await photosStore.initialize();
+		if (authStore.isAuthenticated) {
+			photosStore.startSync(() => authStore.getValidToken());
+			await Promise.all([photoStore.loadStats(), albumStore.loadAlbums(), tagStore.loadTags()]);
+		}
+		if (!authStore.isAuthenticated && shouldShowGuestWelcome('photos')) {
+			showGuestWelcome = true;
+		}
 	}
 </script>
 
-<AuthGate {authStore} {goto} onReady={handleAuthReady}>
+<AuthGate {authStore} {goto} allowGuest={true} onReady={handleAuthReady}>
 	<div class="layout-container">
 		<PillNavigation
 			items={navItems}
@@ -171,7 +182,18 @@
 			</div>
 		</main>
 	</div>
-	<SessionExpiredBanner locale={$locale || 'de'} loginHref="/login" />
+	{#if authStore.isAuthenticated}
+		<SessionExpiredBanner locale={$locale || 'de'} loginHref="/login" />
+	{/if}
+
+	<GuestWelcomeModal
+		appId="photos"
+		visible={showGuestWelcome}
+		onClose={() => (showGuestWelcome = false)}
+		onLogin={() => goto('/login')}
+		onRegister={() => goto('/register')}
+		locale={($locale || 'de') === 'de' ? 'de' : 'en'}
+	/>
 </AuthGate>
 
 <style>
diff --git a/apps/questions/apps/web/package.json b/apps/questions/apps/web/package.json
index f1277e03c..3c9bf7b67 100644
--- a/apps/questions/apps/web/package.json
+++ b/apps/questions/apps/web/package.json
@@ -37,6 +37,7 @@
 		"@manacore/shared-types": "workspace:*",
 		"@manacore/shared-utils": "workspace:*",
 		"@manacore/shared-auth-ui": "workspace:*",
+		"@manacore/local-store": "workspace:*",
 		"@manacore/shared-branding": "workspace:*",
 		"@manacore/shared-error-tracking": "workspace:*",
 		"@manacore/shared-i18n": "workspace:*",
diff --git a/apps/questions/apps/web/src/lib/data/guest-seed.ts b/apps/questions/apps/web/src/lib/data/guest-seed.ts
new file mode 100644
index 000000000..f7e004e0e
--- /dev/null
+++ b/apps/questions/apps/web/src/lib/data/guest-seed.ts
@@ -0,0 +1,43 @@
+/**
+ * Guest seed data for the Questions app.
+ *
+ * Provides demo collections and questions for the onboarding experience.
+ */
+
+import type { LocalCollection, LocalQuestion } from './local-store';
+
+const DEMO_COLLECTION_ID = 'demo-research';
+
+export const guestCollections: LocalCollection[] = [
+	{
+		id: DEMO_COLLECTION_ID,
+		name: 'Erste Recherche',
+		description: 'Beispiel-Sammlung zum Kennenlernen.',
+		color: '#6366f1',
+		icon: 'search',
+		isDefault: true,
+		sortOrder: 0,
+	},
+];
+
+export const guestQuestions: LocalQuestion[] = [
+	{
+		id: 'q-1',
+		collectionId: DEMO_COLLECTION_ID,
+		title: 'Was ist Local-First Software?',
+		description: 'Wie funktioniert der Ansatz und welche Vorteile hat er?',
+		status: 'open',
+		priority: 'normal',
+		tags: ['tech', 'architektur'],
+		researchDepth: 'standard',
+	},
+	{
+		id: 'q-2',
+		collectionId: DEMO_COLLECTION_ID,
+		title: 'Welche Datenbanken eignen sich für Offline-First Apps?',
+		status: 'open',
+		priority: 'normal',
+		tags: ['tech', 'datenbank'],
+		researchDepth: 'quick',
+	},
+];
diff --git a/apps/questions/apps/web/src/lib/data/local-store.ts b/apps/questions/apps/web/src/lib/data/local-store.ts
new file mode 100644
index 000000000..6d34bf7b9
--- /dev/null
+++ b/apps/questions/apps/web/src/lib/data/local-store.ts
@@ -0,0 +1,71 @@
+/**
+ * Questions — Local-First Data Layer
+ *
+ * Questions, collections, and answers stored locally.
+ * Research (via mana-search) remains server-side.
+ */
+
+import { createLocalStore, type BaseRecord } from '@manacore/local-store';
+import { guestCollections, guestQuestions } from './guest-seed';
+
+// ─── Types ──────────────────────────────────────────────────
+
+export interface LocalCollection extends BaseRecord {
+	name: string;
+	description?: string | null;
+	color: string;
+	icon: string;
+	isDefault: boolean;
+	sortOrder: number;
+}
+
+export interface LocalQuestion extends BaseRecord {
+	collectionId?: string | null;
+	title: string;
+	description?: string | null;
+	status: 'open' | 'researching' | 'answered' | 'archived';
+	priority: 'low' | 'normal' | 'high' | 'urgent';
+	tags: string[];
+	researchDepth: 'quick' | 'standard' | 'deep';
+}
+
+export interface LocalAnswer extends BaseRecord {
+	questionId: string;
+	researchResultId?: string | null;
+	content: string;
+	citations: Array<{ sourceId: string; text: string }>;
+	rating?: number | null;
+	isAccepted: boolean;
+}
+
+// ─── Store ──────────────────────────────────────────────────
+
+const SYNC_SERVER_URL = import.meta.env.PUBLIC_SYNC_SERVER_URL || 'http://localhost:3050';
+
+export const questionsAppStore = createLocalStore({
+	appId: 'questions',
+	collections: [
+		{
+			name: 'collections',
+			indexes: ['sortOrder', 'isDefault'],
+			guestSeed: guestCollections,
+		},
+		{
+			name: 'questions',
+			indexes: ['collectionId', 'status', 'priority', '[collectionId+status]'],
+			guestSeed: guestQuestions,
+		},
+		{
+			name: 'answers',
+			indexes: ['questionId', 'isAccepted'],
+		},
+	],
+	sync: {
+		serverUrl: SYNC_SERVER_URL,
+	},
+});
+
+// Typed collection accessors
+export const collectionCollection = questionsAppStore.collection<LocalCollection>('collections');
+export const questionCollection = questionsAppStore.collection<LocalQuestion>('questions');
+export const answerCollection = questionsAppStore.collection<LocalAnswer>('answers');
diff --git a/apps/questions/apps/web/src/routes/(app)/+layout.svelte b/apps/questions/apps/web/src/routes/(app)/+layout.svelte
index 55034b9c7..44bdbf25c 100644
--- a/apps/questions/apps/web/src/routes/(app)/+layout.svelte
+++ b/apps/questions/apps/web/src/routes/(app)/+layout.svelte
@@ -8,6 +8,9 @@
 	import { apiClient } from '$lib/api/client';
 	import { questionsApi } from '$lib/api/questions';
 	import { theme } from '$lib/stores/theme';
+	import { AuthGate, GuestWelcomeModal } from '@manacore/shared-auth-ui';
+	import { shouldShowGuestWelcome } from '@manacore/shared-auth-ui';
+	import { questionsAppStore } from '$lib/data/local-store';
 	import { PillNavigation, QuickInputBar, TagStrip } from '@manacore/shared-ui';
 	import type {
 		PillNavItem,
@@ -41,34 +44,29 @@
 	// User email for nav
 	let userEmail = $derived(authStore.user?.email || 'Menu');
 
-	onMount(async () => {
-		// Initialize auth and redirect if not authenticated
-		await authStore.initialize();
-		if (!authStore.isAuthenticated) {
-			goto('/login');
-			return;
+	let showGuestWelcome = $state(false);
+
+	async function handleAuthReady() {
+		await questionsAppStore.initialize();
+		if (authStore.isAuthenticated) {
+			questionsAppStore.startSync(() => authStore.getValidToken());
+			const token = await authStore.getValidToken();
+			apiClient.setAccessToken(token);
+			await collectionsStore.load();
+			await questionsStore.load();
+			await tagStore.fetchTags();
+		}
+		if (!authStore.isAuthenticated && shouldShowGuestWelcome('questions')) {
+			showGuestWelcome = true;
 		}
-
-		// Set API token
-		const token = await authStore.getValidToken();
-		apiClient.setAccessToken(token);
-
-		// Load initial data
-		await collectionsStore.load();
-		await questionsStore.load();
-		await tagStore.fetchTags();
-
-		// Initialize mobile state
 		updateMobileState();
-
-		// Restore nav mode from localStorage
 		if (browser) {
 			const savedCollapsed = localStorage.getItem('questions-nav-collapsed');
 			if (savedCollapsed === 'true') {
 				isCollapsed = true;
 			}
 		}
-	});
+	}
 
 	async function handleSignOut() {
 		await authStore.signOut();
@@ -199,71 +197,82 @@
 
 <svelte:window onresize={updateMobileState} />
 
-<div class="layout-container">
-	<!-- TagStrip (above PillNav, toggled via Tags pill) -->
-	{#if isTagStripVisible}
-		<TagStrip
-			tags={tagStore.tags.map((t) => ({
-				id: t.id,
-				name: t.name,
-				color: t.color || '#3b82f6',
-			}))}
-			selectedIds={[]}
-			onToggle={() => {}}
-			onClear={() => {}}
-			managementHref="/tags"
-			loading={tagStore.loading}
+<AuthGate {authStore} {goto} allowGuest={true} onReady={handleAuthReady}>
+	<div class="layout-container">
+		<!-- TagStrip (above PillNav, toggled via Tags pill) -->
+		{#if isTagStripVisible}
+			<TagStrip
+				tags={tagStore.tags.map((t) => ({
+					id: t.id,
+					name: t.name,
+					color: t.color || '#3b82f6',
+				}))}
+				selectedIds={[]}
+				onToggle={() => {}}
+				onClear={() => {}}
+				managementHref="/tags"
+				loading={tagStore.loading}
+			/>
+		{/if}
+
+		<!-- Navigation -->
+		<PillNavigation
+			items={navItems}
+			currentPath={$page.url.pathname}
+			appName="Questions"
+			homeRoute="/"
+			onToggleTheme={handleToggleTheme}
+			{isDark}
+			{isCollapsed}
+			onCollapsedChange={handleCollapsedChange}
+			showThemeToggle={true}
+			showLogout={true}
+			onLogout={handleSignOut}
+			loginHref="/login"
+			primaryColor="#8b5cf6"
+			showAppSwitcher={true}
+			{appItems}
+			{userEmail}
+			settingsHref="/settings"
+			themesHref="/themes"
+			helpHref="/help"
+			profileHref="/profile"
 		/>
-	{/if}
 
-	<!-- Navigation -->
-	<PillNavigation
-		items={navItems}
-		currentPath={$page.url.pathname}
-		appName="Questions"
-		homeRoute="/"
-		onToggleTheme={handleToggleTheme}
-		{isDark}
-		{isCollapsed}
-		onCollapsedChange={handleCollapsedChange}
-		showThemeToggle={true}
-		showLogout={true}
-		onLogout={handleSignOut}
-		loginHref="/login"
-		primaryColor="#8b5cf6"
-		showAppSwitcher={true}
-		{appItems}
-		{userEmail}
-		settingsHref="/settings"
-		themesHref="/themes"
-		helpHref="/help"
-		profileHref="/profile"
+		<!-- Quick Input Bar -->
+		<QuickInputBar
+			onSearch={handleSearch}
+			onSelect={handleSelect}
+			placeholder="New question or search..."
+			emptyText="No questions found"
+			searchingText="Searching..."
+			searchText="Search"
+			onCreate={handleCreate}
+			onParseCreate={handleParseCreate}
+			createText="Create"
+			deferSearch={true}
+			locale={$locale || 'en'}
+			appIcon="help-circle"
+			bottomOffset={isMobile ? '70px' : '70px'}
+		/>
+
+		<!-- Main Content -->
+		<main class="main-content bg-background">
+			<div class="content-wrapper">
+				{@render children()}
+			</div>
+		</main>
+	</div>
+
+	<GuestWelcomeModal
+		appId="questions"
+		visible={showGuestWelcome}
+		onClose={() => (showGuestWelcome = false)}
+		onLogin={() => goto('/login')}
+		onRegister={() => goto('/register')}
+		locale="de"
 	/>
-
-	<!-- Quick Input Bar -->
-	<QuickInputBar
-		onSearch={handleSearch}
-		onSelect={handleSelect}
-		placeholder="New question or search..."
-		emptyText="No questions found"
-		searchingText="Searching..."
-		searchText="Search"
-		onCreate={handleCreate}
-		onParseCreate={handleParseCreate}
-		createText="Create"
-		deferSearch={true}
-		locale={$locale || 'en'}
-		appIcon="help-circle"
-		bottomOffset={isMobile ? '70px' : '70px'}
-	/>
-
-	<!-- Main Content -->
-	<main class="main-content bg-background">
-		<div class="content-wrapper">
-			{@render children()}
-		</div>
-	</main>
-</div>
+</AuthGate>
 
 <style>
 	.layout-container {