feat(apps): migrate Presi, Picture, Inventar, NutriPhi, Planta, Storage to local-first

Add IndexedDB data layer (Dexie.js via @manacore/local-store) to 6 more apps, bringing the total to 12/22 apps with local-first architecture. For each app: - Create local-store.ts with typed collections and sync config - Create guest-seed.ts with onboarding data for guest mode - Update layout with AuthGate allowGuest={true} + handleAuthReady() - Add GuestWelcomeModal for first-visit experience - Add @manacore/local-store dependency App-specific changes: - Presi: Rewrite decks store from API to IndexedDB, conditional share button - Picture: Rewrite gallery + boards pages to read from IndexedDB - Inventar: Replace manual auth $effect with AuthGate, keep localStorage stores - NutriPhi: Add onReady handler to existing AuthGate - Planta: Add allowGuest + sync init to existing AuthGate - Storage: Add local store init to existing handleAuthReady Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
2026-05-14 19:21:10 +02:00 · 2026-03-27 17:35:38 +01:00 · 2026-03-27 17:35:38 +01:00 · ce51fd5fe2
commit ce51fd5fe2
parent 8f40de2966
31 changed files with 1623 additions and 211 deletions
--- a/.claude/plans/local-first-architecture-migration.md
+++ b/.claude/plans/local-first-architecture-migration.md
@ -313,7 +313,7 @@ apps/todo/apps/backend/     # Oder: services/todo/ (umstrukturieren?)

 ---

-## Phase 3: Rollout auf alle Apps (4-6 Wochen) — 6/8 DONE 2026-03-27
+## Phase 3: Rollout auf alle Apps (4-6 Wochen) — 8/8 DONE 2026-03-27

 Reihenfolge nach Komplexität:

--- a/CLAUDE.md
+++ b/CLAUDE.md
@ -532,8 +532,12 @@ Logged in:  App → IndexedDB → UI → SyncEngine → mana-sync (Go) → Postg
 | Clock | alarms, timers, worldClocks | Done |
 | Contacts | contacts | Done |
 | ManaDeck | decks, cards | Done |
-| Picture | — | Not yet |
-| Presi | — | Not yet |
+| Picture | images, boards, boardItems, tags, imageTags | Done |
+| Presi | decks, slides | Done |
+| Inventar | collections, items, locations, categories | Done |
+| NutriPhi | meals, goals, favorites | Done |
+| Planta | plants, plantPhotos, wateringSchedules, wateringLogs | Done |
+| Storage | files, folders, tags, fileTags | Done |

 ### Dev Commands (Local-First Stack)

--- a/apps/inventar/apps/web/package.json
+++ b/apps/inventar/apps/web/package.json
@ -33,6 +33,8 @@
 		"@manacore/shared-branding": "workspace:*",
 		"@manacore/shared-error-tracking": "workspace:*",
 		"@manacore/shared-icons": "workspace:*",
+		"@manacore/local-store": "workspace:*",
+		"@manacore/shared-auth-ui": "workspace:*",
 		"@manacore/shared-landing-ui": "workspace:*",
 		"@manacore/shared-profile-ui": "workspace:*",
 		"@manacore/shared-feedback-service": "workspace:*",
--- a/apps/inventar/apps/web/src/lib/data/guest-seed.ts
+++ b/apps/inventar/apps/web/src/lib/data/guest-seed.ts
@ -0,0 +1,100 @@
+/**
+ * Guest seed data for the Inventar app.
+ *
+ * Provides a demo collection with sample items and locations.
+ */
+
+import type { LocalCollection, LocalItem, LocalLocation, LocalCategory } from './local-store';
+
+const DEMO_COLLECTION_ID = 'demo-electronics';
+const DEMO_LOCATION_ID = 'demo-home';
+const DEMO_CATEGORY_ID = 'demo-tech';
+
+export const guestCollections: LocalCollection[] = [
+	{
+		id: DEMO_COLLECTION_ID,
+		name: 'Meine Elektronik',
+		description: 'Beispiel-Sammlung zum Kennenlernen von Inventar.',
+		icon: '💻',
+		color: '#3b82f6',
+		schema: {
+			fields: [
+				{ id: 'brand', name: 'Marke', type: 'text', order: 0 },
+				{ id: 'model', name: 'Modell', type: 'text', order: 1 },
+				{ id: 'serial', name: 'Seriennummer', type: 'text', order: 2 },
+			],
+		},
+		order: 0,
+		itemCount: 2,
+	},
+];
+
+export const guestItems: LocalItem[] = [
+	{
+		id: 'item-laptop',
+		collectionId: DEMO_COLLECTION_ID,
+		locationId: DEMO_LOCATION_ID,
+		categoryId: DEMO_CATEGORY_ID,
+		name: 'MacBook Pro',
+		description: 'Arbeits-Laptop',
+		status: 'owned',
+		quantity: 1,
+		fieldValues: { brand: 'Apple', model: 'MacBook Pro 14"', serial: 'ABC123' },
+		photos: [],
+		notes: [],
+		tags: ['arbeit'],
+		order: 0,
+	},
+	{
+		id: 'item-headphones',
+		collectionId: DEMO_COLLECTION_ID,
+		locationId: DEMO_LOCATION_ID,
+		name: 'Kopfhörer',
+		description: 'Noise-Cancelling Kopfhörer',
+		status: 'owned',
+		quantity: 1,
+		fieldValues: { brand: 'Sony', model: 'WH-1000XM5' },
+		photos: [],
+		notes: [],
+		tags: ['audio'],
+		order: 1,
+	},
+];
+
+export const guestLocations: LocalLocation[] = [
+	{
+		id: DEMO_LOCATION_ID,
+		name: 'Zuhause',
+		description: 'Mein Zuhause',
+		icon: '🏠',
+		path: 'Zuhause',
+		depth: 0,
+		order: 0,
+	},
+	{
+		id: 'demo-office',
+		parentId: DEMO_LOCATION_ID,
+		name: 'Büro',
+		icon: '🖥️',
+		path: 'Zuhause/Büro',
+		depth: 1,
+		order: 0,
+	},
+];
+
+export const guestCategories: LocalCategory[] = [
+	{
+		id: DEMO_CATEGORY_ID,
+		name: 'Technik',
+		icon: '⚡',
+		color: '#6366f1',
+		order: 0,
+	},
+	{
+		id: 'demo-audio',
+		name: 'Audio',
+		icon: '🎧',
+		color: '#ec4899',
+		order: 1,
+	},
+];
--- a/apps/inventar/apps/web/src/lib/data/local-store.ts
+++ b/apps/inventar/apps/web/src/lib/data/local-store.ts
@ -0,0 +1,120 @@
+/**
+ * Inventar — Local-First Data Layer
+ *
+ * Migrates from localStorage to IndexedDB (Dexie.js) with sync support.
+ * Collections, items, locations, and categories are stored locally.
+ */
+
+import { createLocalStore, type BaseRecord } from '@manacore/local-store';
+import { guestCollections, guestItems, guestLocations, guestCategories } from './guest-seed';
+
+// ─── Types ──────────────────────────────────────────────────
+
+export interface LocalCollection extends BaseRecord {
+	name: string;
+	description?: string | null;
+	icon?: string | null;
+	color?: string | null;
+	schema: {
+		fields: Array<{
+			id: string;
+			name: string;
+			type: string;
+			required?: boolean;
+			defaultValue?: unknown;
+			options?: string[];
+			currencyCode?: string;
+			placeholder?: string;
+			order: number;
+		}>;
+	};
+	templateId?: string | null;
+	order: number;
+	itemCount: number;
+}
+
+export interface LocalItem extends BaseRecord {
+	collectionId: string;
+	locationId?: string | null;
+	categoryId?: string | null;
+	name: string;
+	description?: string | null;
+	status: 'owned' | 'lent' | 'stored' | 'for_sale' | 'disposed';
+	quantity: number;
+	fieldValues: Record<string, unknown>;
+	purchaseData?: {
+		price?: number;
+		currency?: string;
+		date?: string;
+		retailer?: string;
+		warrantyExpiry?: string;
+	} | null;
+	photos: Array<{ id: string; url: string; caption?: string; order: number }>;
+	notes: Array<{ id: string; content: string; createdAt: string }>;
+	tags: string[];
+	order: number;
+}
+
+export interface LocalLocation extends BaseRecord {
+	parentId?: string | null;
+	name: string;
+	description?: string | null;
+	icon?: string | null;
+	path: string;
+	depth: number;
+	order: number;
+}
+
+export interface LocalCategory extends BaseRecord {
+	parentId?: string | null;
+	name: string;
+	icon?: string | null;
+	color?: string | null;
+	order: number;
+}
+
+// ─── Store ──────────────────────────────────────────────────
+
+const SYNC_SERVER_URL = import.meta.env.PUBLIC_SYNC_SERVER_URL || 'http://localhost:3050';
+
+export const inventarStore = createLocalStore({
+	appId: 'inventar',
+	collections: [
+		{
+			name: 'collections',
+			indexes: ['order', 'templateId'],
+			guestSeed: guestCollections,
+		},
+		{
+			name: 'items',
+			indexes: [
+				'collectionId',
+				'locationId',
+				'categoryId',
+				'status',
+				'name',
+				'[collectionId+order]',
+			],
+			guestSeed: guestItems,
+		},
+		{
+			name: 'locations',
+			indexes: ['parentId', 'path', 'depth', 'order'],
+			guestSeed: guestLocations,
+		},
+		{
+			name: 'categories',
+			indexes: ['parentId', 'order'],
+			guestSeed: guestCategories,
+		},
+	],
+	sync: {
+		serverUrl: SYNC_SERVER_URL,
+	},
+});
+
+// Typed collection accessors
+export const collectionCollection = inventarStore.collection<LocalCollection>('collections');
+export const itemCollection = inventarStore.collection<LocalItem>('items');
+export const locationCollection = inventarStore.collection<LocalLocation>('locations');
+export const categoryCollection = inventarStore.collection<LocalCategory>('categories');
--- a/apps/inventar/apps/web/src/routes/(app)/+layout.svelte
+++ b/apps/inventar/apps/web/src/routes/(app)/+layout.svelte
@ -12,30 +12,38 @@
 	import { setLocale, supportedLocales } from '$lib/i18n';
 	import { PillNavigation } from '@manacore/shared-ui';
 	import { getPillAppItems } from '@manacore/shared-branding';
+	import { AuthGate, GuestWelcomeModal } from '@manacore/shared-auth-ui';
+	import { shouldShowGuestWelcome } from '@manacore/shared-auth-ui';
+	import { inventarStore } from '$lib/data/local-store';

 	let { children } = $props();

 	let showNav = $state(true);
 	let initialized = $state(false);
+	let showGuestWelcome = $state(false);

-	// Initialize stores
-	$effect(() => {
-		if (authStore.initialized && !initialized) {
-			collectionsStore.initialize();
-			itemsStore.initialize();
-			locationsStore.initialize();
-			categoriesStore.initialize();
-			viewStore.initialize();
-			initialized = true;
-		}
-	});
+	async function handleAuthReady() {
+		// Initialize local-first database
+		await inventarStore.initialize();

-	// Auth gate
-	$effect(() => {
-		if (authStore.initialized && !authStore.isAuthenticated) {
-			goto('/login');
+		// If authenticated, start syncing
+		if (authStore.isAuthenticated) {
+			inventarStore.startSync(() => authStore.getValidToken());
 		}
-	});
+
+		// Initialize legacy localStorage stores (will be migrated to IndexedDB later)
+		collectionsStore.initialize();
+		itemsStore.initialize();
+		locationsStore.initialize();
+		categoriesStore.initialize();
+		viewStore.initialize();
+		initialized = true;
+
+		// Show guest welcome on first visit
+		if (!authStore.isAuthenticated && shouldShowGuestWelcome('inventar')) {
+			showGuestWelcome = true;
+		}
+	}

 	const navItems = [
 		{ href: '/', label: 'Sammlungen', icon: 'archive' },
@ -54,17 +62,7 @@
 	}
 </script>

-{#if !authStore.initialized}
-	<div class="flex min-h-screen items-center justify-center">
-		<div
-			class="h-8 w-8 animate-spin rounded-full border-2 border-[hsl(var(--primary))] border-t-transparent"
-		></div>
-	</div>
-{:else if !authStore.isAuthenticated}
-	<div class="flex min-h-screen items-center justify-center">
-		<p class="text-[hsl(var(--muted-foreground))]">Weiterleitung...</p>
-	</div>
-{:else}
+<AuthGate {authStore} {goto} allowGuest={true} onReady={handleAuthReady}>
 	<div class="flex min-h-screen flex-col">
 		<!-- Top Navigation -->
 		{#if showNav}
@ -170,4 +168,14 @@
 			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4" />
 		</svg>
 	</button>
-{/if}
+
+	<!-- Guest Welcome Modal -->
+	<GuestWelcomeModal
+		appId="inventar"
+		visible={showGuestWelcome}
+		onClose={() => (showGuestWelcome = false)}
+		onLogin={() => goto('/login')}
+		onRegister={() => goto('/register')}
+		locale="de"
+	/>
+</AuthGate>
--- a/apps/nutriphi/apps/web/package.json
+++ b/apps/nutriphi/apps/web/package.json
@ -50,6 +50,7 @@
 		"@manacore/shared-help-types": "workspace:*",
 		"@manacore/shared-help-ui": "workspace:*",
 		"@manacore/shared-icons": "workspace:*",
+		"@manacore/local-store": "workspace:*",
 		"@manacore/shared-profile-ui": "workspace:*",
 		"@manacore/shared-subscription-ui": "workspace:*",
 		"@manacore/shared-tailwind": "workspace:*",
--- a/apps/nutriphi/apps/web/src/lib/data/guest-seed.ts
+++ b/apps/nutriphi/apps/web/src/lib/data/guest-seed.ts
@ -0,0 +1,55 @@
+/**
+ * Guest seed data for the NutriPhi app.
+ *
+ * Provides demo meals and default goals for the onboarding experience.
+ */
+
+import type { LocalMeal, LocalGoal } from './local-store';
+
+const today = new Date().toISOString().split('T')[0];
+
+export const guestMeals: LocalMeal[] = [
+	{
+		id: 'meal-breakfast',
+		date: today,
+		mealType: 'breakfast',
+		inputType: 'text',
+		description: 'Haferflocken mit Banane und Honig',
+		confidence: 0.9,
+		nutrition: {
+			calories: 380,
+			protein: 10,
+			carbohydrates: 68,
+			fat: 8,
+			fiber: 6,
+			sugar: 24,
+		},
+	},
+	{
+		id: 'meal-lunch',
+		date: today,
+		mealType: 'lunch',
+		inputType: 'text',
+		description: 'Vollkorn-Sandwich mit Avocado und Ei',
+		confidence: 0.85,
+		nutrition: {
+			calories: 520,
+			protein: 22,
+			carbohydrates: 45,
+			fat: 28,
+			fiber: 8,
+			sugar: 4,
+		},
+	},
+];
+
+export const guestGoals: LocalGoal[] = [
+	{
+		id: 'default-goals',
+		dailyCalories: 2000,
+		dailyProtein: 60,
+		dailyCarbs: 250,
+		dailyFat: 65,
+		dailyFiber: 30,
+	},
+];
--- a/apps/nutriphi/apps/web/src/lib/data/local-store.ts
+++ b/apps/nutriphi/apps/web/src/lib/data/local-store.ts
@ -0,0 +1,83 @@
+/**
+ * NutriPhi — Local-First Data Layer
+ *
+ * Meals, nutrition, goals, and favorites stored locally.
+ * AI analysis and recommendations remain server-side.
+ */
+
+import { createLocalStore, type BaseRecord } from '@manacore/local-store';
+import { guestMeals, guestGoals } from './guest-seed';
+
+// ─── Types ──────────────────────────────────────────────────
+
+export interface LocalMeal extends BaseRecord {
+	date: string;
+	mealType: 'breakfast' | 'lunch' | 'dinner' | 'snack';
+	inputType: 'photo' | 'text';
+	description: string;
+	portionSize?: string | null;
+	confidence: number;
+	nutrition?: {
+		calories: number;
+		protein: number;
+		carbohydrates: number;
+		fat: number;
+		fiber: number;
+		sugar: number;
+	} | null;
+}
+
+export interface LocalGoal extends BaseRecord {
+	dailyCalories: number;
+	dailyProtein?: number | null;
+	dailyCarbs?: number | null;
+	dailyFat?: number | null;
+	dailyFiber?: number | null;
+}
+
+export interface LocalFavorite extends BaseRecord {
+	name: string;
+	description: string;
+	mealType: 'breakfast' | 'lunch' | 'dinner' | 'snack';
+	nutrition: {
+		calories: number;
+		protein: number;
+		carbohydrates: number;
+		fat: number;
+		fiber: number;
+		sugar: number;
+	};
+	usageCount: number;
+}
+
+// ─── Store ──────────────────────────────────────────────────
+
+const SYNC_SERVER_URL = import.meta.env.PUBLIC_SYNC_SERVER_URL || 'http://localhost:3050';
+
+export const nutriphiStore = createLocalStore({
+	appId: 'nutriphi',
+	collections: [
+		{
+			name: 'meals',
+			indexes: ['date', 'mealType', '[date+mealType]'],
+			guestSeed: guestMeals,
+		},
+		{
+			name: 'goals',
+			indexes: [],
+			guestSeed: guestGoals,
+		},
+		{
+			name: 'favorites',
+			indexes: ['mealType', 'usageCount'],
+		},
+	],
+	sync: {
+		serverUrl: SYNC_SERVER_URL,
+	},
+});
+
+// Typed collection accessors
+export const mealCollection = nutriphiStore.collection<LocalMeal>('meals');
+export const goalCollection = nutriphiStore.collection<LocalGoal>('goals');
+export const favoriteCollection = nutriphiStore.collection<LocalFavorite>('favorites');
--- a/apps/nutriphi/apps/web/src/routes/+layout.svelte
+++ b/apps/nutriphi/apps/web/src/routes/+layout.svelte
@ -8,9 +8,13 @@
 	import { authStore } from '$lib/stores/auth.svelte';
 	import { mealsStore } from '$lib/stores/meals.svelte';
 	import { parseMealInput, formatParsedMealPreview } from '$lib/utils/meal-parser';
-	import { SessionExpiredBanner, AuthGate } from '@manacore/shared-auth-ui';
+	import { SessionExpiredBanner, AuthGate, GuestWelcomeModal } from '@manacore/shared-auth-ui';
+	import { shouldShowGuestWelcome } from '@manacore/shared-auth-ui';
+	import { nutriphiStore } from '$lib/data/local-store';
 	let { children } = $props();

+	let showGuestWelcome = $state(false);
+
 	// QuickInputBar handlers - search recent meals
 	async function handleSearch(query: string): Promise<QuickInputItem[]> {
 		const q = query.toLowerCase();
@ -38,6 +42,16 @@
 		};
 	}

+	async function handleAuthReady() {
+		await nutriphiStore.initialize();
+		if (authStore.isAuthenticated) {
+			nutriphiStore.startSync(() => authStore.getValidToken());
+		}
+		if (!authStore.isAuthenticated && shouldShowGuestWelcome('nutriphi')) {
+			showGuestWelcome = true;
+		}
+	}
+
 	async function handleCreate(query: string): Promise<void> {
 		if (!query.trim()) return;
 		const parsed = parseMealInput(query);
@ -60,7 +74,7 @@
 	{/if}
 </svelte:head>

-<AuthGate {authStore} {goto} allowGuest={true}>
+<AuthGate {authStore} {goto} allowGuest={true} onReady={handleAuthReady}>
 	{#if $i18nLoading}
 		<div class="flex min-h-screen items-center justify-center bg-background">
 			<div
@ -88,4 +102,13 @@
 		{/if}
 		<SessionExpiredBanner locale="de" loginHref="/login" />
 	{/if}
+
+	<GuestWelcomeModal
+		appId="nutriphi"
+		visible={showGuestWelcome}
+		onClose={() => (showGuestWelcome = false)}
+		onLogin={() => goto('/login')}
+		onRegister={() => goto('/register')}
+		locale="de"
+	/>
 </AuthGate>
--- a/apps/picture/apps/web/package.json
+++ b/apps/picture/apps/web/package.json
@ -28,6 +28,7 @@
 		"@manacore/shared-help-types": "workspace:*",
 		"@manacore/shared-help-ui": "workspace:*",
 		"@manacore/shared-icons": "workspace:*",
+		"@manacore/local-store": "workspace:*",
 		"@manacore/shared-profile-ui": "workspace:*",
 		"@manacore/shared-stores": "workspace:*",
 		"@manacore/shared-tags": "workspace:*",
--- a/apps/picture/apps/web/src/lib/data/guest-seed.ts
+++ b/apps/picture/apps/web/src/lib/data/guest-seed.ts
@ -0,0 +1,131 @@
+/**
+ * Guest seed data for the Picture app.
+ *
+ * Provides a demo board with text items to showcase the moodboard feature.
+ * No actual images are included since generation requires authentication.
+ */
+
+import type { LocalBoard, LocalBoardItem, LocalTag } from './local-store';
+
+const DEMO_BOARD_ID = 'demo-moodboard';
+
+export const guestBoards: LocalBoard[] = [
+	{
+		id: DEMO_BOARD_ID,
+		name: 'Willkommen bei Picture',
+		description: 'Dein erstes Moodboard — erstelle eigene Bilder mit KI!',
+		canvasWidth: 2000,
+		canvasHeight: 1500,
+		backgroundColor: '#1e1e2e',
+		isPublic: false,
+	},
+];
+
+export const guestBoardItems: LocalBoardItem[] = [
+	{
+		id: 'text-welcome',
+		boardId: DEMO_BOARD_ID,
+		itemType: 'text',
+		textContent: 'Willkommen bei Picture!',
+		fontSize: 48,
+		color: '#ffffff',
+		positionX: 600,
+		positionY: 200,
+		scaleX: 1,
+		scaleY: 1,
+		rotation: 0,
+		zIndex: 10,
+		opacity: 1,
+		width: 800,
+		height: null,
+		properties: {
+			fontFamily: 'Arial',
+			fontWeight: 'bold',
+			textAlign: 'center',
+		},
+	},
+	{
+		id: 'text-hint-1',
+		boardId: DEMO_BOARD_ID,
+		itemType: 'text',
+		textContent: 'Erstelle KI-Bilder mit einem Prompt',
+		fontSize: 24,
+		color: '#a0a0c0',
+		positionX: 650,
+		positionY: 400,
+		scaleX: 1,
+		scaleY: 1,
+		rotation: 0,
+		zIndex: 9,
+		opacity: 1,
+		width: 700,
+		height: null,
+		properties: {
+			fontFamily: 'Arial',
+			fontWeight: 'normal',
+			textAlign: 'center',
+		},
+	},
+	{
+		id: 'text-hint-2',
+		boardId: DEMO_BOARD_ID,
+		itemType: 'text',
+		textContent: 'Organisiere Bilder in Moodboards',
+		fontSize: 24,
+		color: '#a0a0c0',
+		positionX: 650,
+		positionY: 500,
+		scaleX: 1,
+		scaleY: 1,
+		rotation: 0,
+		zIndex: 8,
+		opacity: 1,
+		width: 700,
+		height: null,
+		properties: {
+			fontFamily: 'Arial',
+			fontWeight: 'normal',
+			textAlign: 'center',
+		},
+	},
+	{
+		id: 'text-hint-3',
+		boardId: DEMO_BOARD_ID,
+		itemType: 'text',
+		textContent: 'Melde dich an, um loszulegen →',
+		fontSize: 20,
+		color: '#6366f1',
+		positionX: 700,
+		positionY: 650,
+		scaleX: 1,
+		scaleY: 1,
+		rotation: 0,
+		zIndex: 7,
+		opacity: 1,
+		width: 600,
+		height: null,
+		properties: {
+			fontFamily: 'Arial',
+			fontWeight: 'bold',
+			textAlign: 'center',
+		},
+	},
+];
+
+export const guestTags: LocalTag[] = [
+	{
+		id: 'tag-landscape',
+		name: 'Landschaft',
+		color: '#22c55e',
+	},
+	{
+		id: 'tag-portrait',
+		name: 'Portrait',
+		color: '#3b82f6',
+	},
+	{
+		id: 'tag-abstract',
+		name: 'Abstrakt',
+		color: '#a855f7',
+	},
+];
--- a/apps/picture/apps/web/src/lib/data/local-store.ts
+++ b/apps/picture/apps/web/src/lib/data/local-store.ts
@ -0,0 +1,116 @@
+/**
+ * Picture — Local-First Data Layer
+ *
+ * Defines the IndexedDB database, collections, and guest seed data.
+ * Images metadata, boards, board items, and tags are stored locally.
+ * Image generation, upload, and explore remain server-side.
+ */
+
+import { createLocalStore, type BaseRecord } from '@manacore/local-store';
+import { guestBoards, guestBoardItems, guestTags } from './guest-seed';
+
+// ─── Types ──────────────────────────────────────────────────
+
+export interface LocalImage extends BaseRecord {
+	prompt: string;
+	negativePrompt?: string | null;
+	model?: string | null;
+	style?: string | null;
+	publicUrl?: string | null;
+	storagePath: string;
+	filename: string;
+	format?: string | null;
+	width?: number | null;
+	height?: number | null;
+	fileSize?: number | null;
+	blurhash?: string | null;
+	isPublic: boolean;
+	isFavorite: boolean;
+	downloadCount: number;
+	rating?: number | null;
+	archivedAt?: string | null;
+	generationId?: string | null;
+	sourceImageId?: string | null;
+}
+
+export interface LocalBoard extends BaseRecord {
+	name: string;
+	description?: string | null;
+	thumbnailUrl?: string | null;
+	canvasWidth: number;
+	canvasHeight: number;
+	backgroundColor: string;
+	isPublic: boolean;
+}
+
+export interface LocalBoardItem extends BaseRecord {
+	boardId: string;
+	itemType: 'image' | 'text';
+	imageId?: string | null;
+	textContent?: string | null;
+	fontSize?: number | null;
+	color?: string | null;
+	positionX: number;
+	positionY: number;
+	scaleX: number;
+	scaleY: number;
+	rotation: number;
+	zIndex: number;
+	opacity: number;
+	width?: number | null;
+	height?: number | null;
+	properties: Record<string, unknown>;
+}
+
+export interface LocalTag extends BaseRecord {
+	name: string;
+	color?: string | null;
+}
+
+export interface LocalImageTag extends BaseRecord {
+	imageId: string;
+	tagId: string;
+}
+
+// ─── Store ──────────────────────────────────────────────────
+
+const SYNC_SERVER_URL = import.meta.env.PUBLIC_SYNC_SERVER_URL || 'http://localhost:3050';
+
+export const pictureStore = createLocalStore({
+	appId: 'picture',
+	collections: [
+		{
+			name: 'images',
+			indexes: ['isFavorite', 'isPublic', 'archivedAt', 'prompt'],
+		},
+		{
+			name: 'boards',
+			indexes: ['isPublic'],
+			guestSeed: guestBoards,
+		},
+		{
+			name: 'boardItems',
+			indexes: ['boardId', 'itemType', 'zIndex', '[boardId+zIndex]'],
+			guestSeed: guestBoardItems,
+		},
+		{
+			name: 'tags',
+			indexes: ['name'],
+			guestSeed: guestTags,
+		},
+		{
+			name: 'imageTags',
+			indexes: ['imageId', 'tagId', '[imageId+tagId]'],
+		},
+	],
+	sync: {
+		serverUrl: SYNC_SERVER_URL,
+	},
+});
+
+// Typed collection accessors
+export const imageCollection = pictureStore.collection<LocalImage>('images');
+export const boardCollection = pictureStore.collection<LocalBoard>('boards');
+export const boardItemCollection = pictureStore.collection<LocalBoardItem>('boardItems');
+export const tagCollection = pictureStore.collection<LocalTag>('tags');
+export const imageTagCollection = pictureStore.collection<LocalImageTag>('imageTags');
--- a/apps/picture/apps/web/src/routes/app/+layout.svelte
+++ b/apps/picture/apps/web/src/routes/app/+layout.svelte
@ -22,7 +22,9 @@
 	import { tagStore } from '$lib/stores/tags';
 	import { pictureOnboarding } from '$lib/stores/app-onboarding.svelte';
 	import { MiniOnboardingModal } from '@manacore/shared-app-onboarding';
-	import { SessionExpiredBanner, AuthGate } from '@manacore/shared-auth-ui';
+	import { SessionExpiredBanner, AuthGate, GuestWelcomeModal } from '@manacore/shared-auth-ui';
+	import { shouldShowGuestWelcome } from '@manacore/shared-auth-ui';
+	import { pictureStore } from '$lib/data/local-store';
 	import { viewMode, setViewMode } from '$lib/stores/view';
 	import type { ViewMode } from '$lib/stores/view';
 	import { browser } from '$app/environment';
@ -35,6 +37,9 @@
 	// PillNav state
 	let isCollapsed = $state(false);

+	// Guest welcome modal state
+	let showGuestWelcome = $state(false);
+
 	// Load persisted nav state
 	$effect(() => {
 		if (browser) {
@ -82,7 +87,22 @@
 	}

 	async function handleAuthReady() {
-		await Promise.all([userSettings.load(), tagStore.fetchTags()]);
+		// Initialize local-first database (opens IndexedDB, seeds guest data)
+		await pictureStore.initialize();
+
+		// If authenticated, start syncing to server
+		if (authStore.isAuthenticated) {
+			pictureStore.startSync(() => authStore.getValidToken());
+		}
+
+		// Show guest welcome modal on first visit
+		if (!authStore.isAuthenticated && shouldShowGuestWelcome('picture')) {
+			showGuestWelcome = true;
+		}
+
+		if (authStore.isAuthenticated) {
+			await Promise.all([userSettings.load(), tagStore.fetchTags()]);
+		}

 		// Redirect to start page if on /app and a custom start page is set
 		const currentPath = window.location.pathname;
@ -169,8 +189,8 @@
 	);
 	let currentLanguageLabel = $derived(getCurrentLanguageLabel(currentLocale));

-	// User email for user dropdown
-	let userEmail = $derived(authStore.user?.email);
+	// User email for user dropdown — empty string for guests so PillNav shows login button
+	let userEmail = $derived(authStore.isAuthenticated ? authStore.user?.email || 'Menü' : '');

 	// Elements (divider + view mode tabs)
 	let elements: PillNavElement[] = $derived([
@ -252,7 +272,7 @@

 <svelte:window on:keydown={handleKeyDown} />

-<AuthGate {authStore} {goto} loginHref="/auth/login" onReady={handleAuthReady}>
+<AuthGate {authStore} {goto} loginHref="/auth/login" allowGuest={true} onReady={handleAuthReady}>
 	<div class="min-h-screen" style="background-color: hsl(var(--color-background));">
 		<!-- PillNavigation (conditionally visible) -->
 		{#if $isUIVisible}
@ -276,7 +296,8 @@
 				showLanguageSwitcher={true}
 				{languageItems}
 				{currentLanguageLabel}
-				showLogout={true}
+				showLogout={authStore.isAuthenticated}
+				loginHref="/auth/login"
 				primaryColor="#3b82f6"
 				showAppSwitcher={true}
 				{appItems}
@ -321,7 +342,19 @@
 		<MiniOnboardingModal store={pictureOnboarding} appName="Picture" appEmoji="🎨" />
 	{/if}

-	<SessionExpiredBanner locale={$locale || 'de'} loginHref="/auth/login" />
+	<!-- Guest Welcome Modal -->
+	<GuestWelcomeModal
+		appId="picture"
+		visible={showGuestWelcome}
+		onClose={() => (showGuestWelcome = false)}
+		onLogin={() => goto('/auth/login')}
+		onRegister={() => goto('/auth/register')}
+		locale={($locale || 'de') === 'de' ? 'de' : 'en'}
+	/>
+
+	{#if authStore.isAuthenticated}
+		<SessionExpiredBanner locale={$locale || 'de'} loginHref="/auth/login" />
+	{/if}
 </AuthGate>

 <style>
--- a/apps/picture/apps/web/src/routes/app/board/+page.svelte
+++ b/apps/picture/apps/web/src/routes/app/board/+page.svelte
@ -13,10 +13,13 @@
 		addBoard,
 		removeBoardFromList,
 	} from '$lib/stores/boards';
-	import { getBoards, deleteBoard, duplicateBoard } from '$lib/api/boards';
+	import type { BoardWithCount } from '$lib/api/boards';
+	import { boardCollection, boardItemCollection, type LocalBoard } from '$lib/data/local-store';
 	import { PageHeader, Button, Modal, toastStore } from '@manacore/shared-ui';
 	import { Plus, SquaresFour, Image, Trash } from '@manacore/shared-icons';

+	const PAGE_SIZE = 20;
+
 	let loadingMore = $state(false);
 	let observer: IntersectionObserver | null = null;
 	let loadMoreTrigger = $state<HTMLElement | null>(null);
@ -30,6 +33,25 @@
 	let showDeleteModal = $state(false);
 	let deletingBoard = $state<string | null>(null);

+	/** Convert LocalBoard to BoardWithCount for existing components. */
+	async function toBoardWithCount(local: LocalBoard): Promise<BoardWithCount> {
+		const items = await boardItemCollection.getAll({ boardId: local.id });
+		return {
+			id: local.id,
+			userId: 'local',
+			name: local.name,
+			description: local.description ?? undefined,
+			thumbnailUrl: local.thumbnailUrl ?? undefined,
+			canvasWidth: local.canvasWidth,
+			canvasHeight: local.canvasHeight,
+			backgroundColor: local.backgroundColor,
+			isPublic: local.isPublic,
+			createdAt: local.createdAt ?? new Date().toISOString(),
+			updatedAt: local.updatedAt ?? new Date().toISOString(),
+			itemCount: items.length,
+		};
+	}
+
 	onMount(() => {
 		resetBoardsState();
 		loadInitialBoards();
@ -57,14 +79,18 @@
 	});

 	async function loadInitialBoards() {
-		if (!authStore.user) return;
-
 		isLoadingBoards.set(true);
 		try {
-			const data = await getBoards({ page: 1 });
+			const localBoards = await boardCollection.getAll();
+			// Sort by updatedAt descending
+			localBoards.sort(
+				(a, b) => new Date(b.updatedAt ?? 0).getTime() - new Date(a.updatedAt ?? 0).getTime()
+			);
+			const page1 = localBoards.slice(0, PAGE_SIZE);
+			const data = await Promise.all(page1.map(toBoardWithCount));
 			boards.set(data);
 			currentBoardsPage.set(1);
-			hasBoardsMore.set(data.length === 20);
+			hasBoardsMore.set(localBoards.length > PAGE_SIZE);
 		} catch (error) {
 			console.error('Error loading boards:', error);
 			toastStore.show('Fehler beim Laden der Boards', 'error');
@ -74,17 +100,24 @@
 	}

 	async function loadMoreBoards() {
-		if (!authStore.user || !$hasBoardsMore || $isLoadingBoards || loadingMore) return;
+		if (!$hasBoardsMore || $isLoadingBoards || loadingMore) return;

 		loadingMore = true;
 		const nextPage = $currentBoardsPage + 1;

 		try {
-			const newBoards = await getBoards({ page: nextPage });
-			if (newBoards.length > 0) {
-				boards.update((current) => [...current, ...newBoards]);
+			const localBoards = await boardCollection.getAll();
+			localBoards.sort(
+				(a, b) => new Date(b.updatedAt ?? 0).getTime() - new Date(a.updatedAt ?? 0).getTime()
+			);
+			const start = (nextPage - 1) * PAGE_SIZE;
+			const pageBoards = localBoards.slice(start, start + PAGE_SIZE);
+
+			if (pageBoards.length > 0) {
+				const data = await Promise.all(pageBoards.map(toBoardWithCount));
+				boards.update((current) => [...current, ...data]);
 				currentBoardsPage.set(nextPage);
-				hasBoardsMore.set(newBoards.length === 20);
+				hasBoardsMore.set(start + PAGE_SIZE < localBoards.length);
 			} else {
 				hasBoardsMore.set(false);
 			}
@ -96,16 +129,22 @@
 	}

 	async function handleCreateBoard() {
-		if (!authStore.user || !boardName.trim()) return;
+		if (!boardName.trim()) return;

 		isCreating = true;
 		try {
-			const { createBoard } = await import('$lib/api/boards');
-			const newBoard = await createBoard({
+			const newLocal: LocalBoard = {
+				id: crypto.randomUUID(),
 				name: boardName,
-				description: boardDescription || undefined,
-			});
-			addBoard({ ...newBoard, itemCount: 0 });
+				description: boardDescription || null,
+				canvasWidth: 2000,
+				canvasHeight: 1500,
+				backgroundColor: '#ffffff',
+				isPublic: false,
+			};
+			const inserted = await boardCollection.insert(newLocal);
+			const boardWithCount = await toBoardWithCount(inserted);
+			addBoard(boardWithCount);
 			showCreateBoardModal.set(false);
 			boardName = '';
 			boardDescription = '';
@ -122,7 +161,12 @@
 		if (!deletingBoard) return;

 		try {
-			await deleteBoard(deletingBoard);
+			// Delete all board items first
+			const items = await boardItemCollection.getAll({ boardId: deletingBoard });
+			for (const item of items) {
+				await boardItemCollection.delete(item.id);
+			}
+			await boardCollection.delete(deletingBoard);
 			removeBoardFromList(deletingBoard);
 			showDeleteModal = false;
 			deletingBoard = null;
@ -134,11 +178,34 @@
 	}

 	async function handleDuplicateBoard(boardId: string) {
-		if (!authStore.user) return;
-
 		try {
-			const newBoard = await duplicateBoard(boardId);
-			addBoard({ ...newBoard, itemCount: 0 });
+			const original = await boardCollection.get(boardId);
+			if (!original) throw new Error('Board not found');
+
+			const newId = crypto.randomUUID();
+			const duplicated: LocalBoard = {
+				id: newId,
+				name: `${original.name} (Kopie)`,
+				description: original.description,
+				canvasWidth: original.canvasWidth,
+				canvasHeight: original.canvasHeight,
+				backgroundColor: original.backgroundColor,
+				isPublic: false,
+			};
+			const inserted = await boardCollection.insert(duplicated);
+
+			// Duplicate board items
+			const originalItems = await boardItemCollection.getAll({ boardId });
+			for (const item of originalItems) {
+				await boardItemCollection.insert({
+					...item,
+					id: crypto.randomUUID(),
+					boardId: newId,
+				});
+			}
+
+			const boardWithCount = await toBoardWithCount(inserted);
+			addBoard(boardWithCount);
 			toastStore.show('Board dupliziert', 'success');
 		} catch (error) {
 			console.error('Error duplicating board:', error);
--- a/apps/picture/apps/web/src/routes/app/gallery/+page.svelte
+++ b/apps/picture/apps/web/src/routes/app/gallery/+page.svelte
@ -10,8 +10,9 @@
 	} from '$lib/stores/images';
 	import { isUIVisible } from '$lib/stores/ui';
 	import { tags, selectedTags } from '$lib/stores/tags';
-	import { getImages } from '$lib/api/images';
-	import { getAllTags } from '$lib/api/tags';
+	import { imageCollection, imageTagCollection, tagCollection } from '$lib/data/local-store';
+	import type { Image } from '$lib/api/images';
+	import type { LocalImage } from '$lib/data/local-store';
 	import GalleryGrid from '$lib/components/gallery/GalleryGrid.svelte';
 	import ImageDetailModal from '$lib/components/gallery/ImageDetailModal.svelte';
 	import QuickGenerateBar from '$lib/components/gallery/QuickGenerateBar.svelte';
@ -22,10 +23,41 @@
 	import { Heart } from '@manacore/shared-icons';
 	import { onMount } from 'svelte';

+	const PAGE_SIZE = 20;
+
 	let loadingMore = $state(false);
 	let observer: IntersectionObserver | null = null;
 	let loadMoreTrigger = $state<HTMLElement | null>(null);

+	/** Convert LocalImage (IndexedDB) to the Image type used by components. */
+	function toImage(local: LocalImage): Image {
+		return {
+			id: local.id,
+			userId: 'local',
+			prompt: local.prompt,
+			negativePrompt: local.negativePrompt ?? undefined,
+			model: local.model ?? undefined,
+			style: local.style ?? undefined,
+			publicUrl: local.publicUrl ?? undefined,
+			storagePath: local.storagePath,
+			filename: local.filename,
+			format: local.format ?? undefined,
+			width: local.width ?? undefined,
+			height: local.height ?? undefined,
+			fileSize: local.fileSize ?? undefined,
+			blurhash: local.blurhash ?? undefined,
+			isPublic: local.isPublic,
+			isFavorite: local.isFavorite,
+			downloadCount: local.downloadCount,
+			rating: local.rating ?? undefined,
+			archivedAt: local.archivedAt ?? undefined,
+			generationId: local.generationId ?? undefined,
+			sourceImageId: local.sourceImageId ?? undefined,
+			createdAt: local.createdAt ?? new Date().toISOString(),
+			updatedAt: local.updatedAt ?? new Date().toISOString(),
+		};
+	}
+
 	onMount(() => {
 		loadTags().then(() => {
 			loadInitialImages();
@ -40,7 +72,7 @@
 			},
 			{
 				threshold: 0.1,
-				rootMargin: '100px', // Load before reaching the trigger
+				rootMargin: '100px',
 			}
 		);

@ -55,8 +87,15 @@

 	async function loadTags() {
 		try {
-			const data = await getAllTags();
-			tags.set(data);
+			const localTags = await tagCollection.getAll();
+			tags.set(
+				localTags.map((t) => ({
+					id: t.id,
+					name: t.name,
+					color: t.color ?? undefined,
+					createdAt: t.createdAt ?? new Date().toISOString(),
+				}))
+			);
 		} catch (error) {
 			console.error('Error loading tags:', error);
 		}
@ -70,18 +109,37 @@
 	});

 	async function loadInitialImages() {
-		if (!authStore.user) return;
-
 		isLoading.set(true);
 		try {
-			const data = await getImages({
-				page: 1,
-				tagIds: $selectedTags.length > 0 ? $selectedTags : undefined,
-				favoritesOnly: $showFavoritesOnly,
-			});
-			images.set(data);
+			let allImages = await imageCollection.getAll();
+
+			// Filter out archived images
+			allImages = allImages.filter((img) => !img.archivedAt);
+
+			// Filter favorites
+			if ($showFavoritesOnly) {
+				allImages = allImages.filter((img) => img.isFavorite);
+			}
+
+			// Filter by tags
+			if ($selectedTags.length > 0) {
+				const allImageTags = await imageTagCollection.getAll();
+				const imageIdsWithTags = new Set(
+					allImageTags.filter((it) => $selectedTags.includes(it.tagId)).map((it) => it.imageId)
+				);
+				allImages = allImages.filter((img) => imageIdsWithTags.has(img.id));
+			}
+
+			// Sort by createdAt descending
+			allImages.sort(
+				(a, b) => new Date(b.createdAt ?? 0).getTime() - new Date(a.createdAt ?? 0).getTime()
+			);
+
+			// Paginate
+			const page1 = allImages.slice(0, PAGE_SIZE);
+			images.set(page1.map(toImage));
 			currentPage.set(1);
-			hasMore.set(data.length === 20);
+			hasMore.set(allImages.length > PAGE_SIZE);
 		} catch (error) {
 			console.error('Error loading images:', error);
 		} finally {
@ -90,21 +148,38 @@
 	}

 	async function loadMoreImages() {
-		if (!authStore.user || !$hasMore || $isLoading || loadingMore) return;
+		if (!$hasMore || $isLoading || loadingMore) return;

 		loadingMore = true;
 		const nextPage = $currentPage + 1;

 		try {
-			const newImages = await getImages({
-				page: nextPage,
-				tagIds: $selectedTags.length > 0 ? $selectedTags : undefined,
-				favoritesOnly: $showFavoritesOnly,
-			});
-			if (newImages.length > 0) {
-				images.update((current) => [...current, ...newImages]);
+			let allImages = await imageCollection.getAll();
+			allImages = allImages.filter((img) => !img.archivedAt);
+
+			if ($showFavoritesOnly) {
+				allImages = allImages.filter((img) => img.isFavorite);
+			}
+
+			if ($selectedTags.length > 0) {
+				const allImageTags = await imageTagCollection.getAll();
+				const imageIdsWithTags = new Set(
+					allImageTags.filter((it) => $selectedTags.includes(it.tagId)).map((it) => it.imageId)
+				);
+				allImages = allImages.filter((img) => imageIdsWithTags.has(img.id));
+			}
+
+			allImages.sort(
+				(a, b) => new Date(b.createdAt ?? 0).getTime() - new Date(a.createdAt ?? 0).getTime()
+			);
+
+			const start = (nextPage - 1) * PAGE_SIZE;
+			const pageImages = allImages.slice(start, start + PAGE_SIZE);
+
+			if (pageImages.length > 0) {
+				images.update((current) => [...current, ...pageImages.map(toImage)]);
 				currentPage.set(nextPage);
-				hasMore.set(newImages.length === 20);
+				hasMore.set(start + PAGE_SIZE < allImages.length);
 			} else {
 				hasMore.set(false);
 			}
--- a/apps/planta/apps/web/package.json
+++ b/apps/planta/apps/web/package.json
@ -41,6 +41,7 @@
 		"@manacore/shared-help-types": "workspace:*",
 		"@manacore/shared-help-ui": "workspace:*",
 		"@manacore/shared-icons": "workspace:*",
+		"@manacore/local-store": "workspace:*",
 		"@manacore/shared-profile-ui": "workspace:*",
 		"@manacore/shared-tailwind": "workspace:*",
 		"@manacore/shared-theme": "workspace:*",
--- a/apps/planta/apps/web/src/lib/data/guest-seed.ts
+++ b/apps/planta/apps/web/src/lib/data/guest-seed.ts
@ -0,0 +1,59 @@
+/**
+ * Guest seed data for the Planta app.
+ *
+ * Provides a demo plant with watering schedule for the onboarding experience.
+ */
+
+import type { LocalPlant, LocalWateringSchedule } from './local-store';
+
+const DEMO_PLANT_ID = 'demo-monstera';
+
+export const guestPlants: LocalPlant[] = [
+	{
+		id: DEMO_PLANT_ID,
+		name: 'Monstera',
+		scientificName: 'Monstera deliciosa',
+		commonName: 'Fensterblatt',
+		lightRequirements: 'bright',
+		wateringFrequencyDays: 7,
+		humidity: 'medium',
+		temperature: '18-24°C',
+		careNotes: 'Mag indirektes Licht. Erde zwischen dem Gießen leicht antrocknen lassen.',
+		isActive: true,
+		healthStatus: 'healthy',
+	},
+	{
+		id: 'demo-cactus',
+		name: 'Kaktus',
+		scientificName: 'Echinocactus grusonii',
+		commonName: 'Schwiegermutterstuhl',
+		lightRequirements: 'direct',
+		wateringFrequencyDays: 21,
+		humidity: 'low',
+		temperature: '15-30°C',
+		careNotes: 'Selten gießen, mag viel Sonne.',
+		isActive: true,
+		healthStatus: 'healthy',
+	},
+];
+
+export const guestWateringSchedules: LocalWateringSchedule[] = [
+	{
+		id: 'schedule-monstera',
+		plantId: DEMO_PLANT_ID,
+		frequencyDays: 7,
+		lastWateredAt: new Date(Date.now() - 3 * 24 * 60 * 60 * 1000).toISOString(),
+		nextWateringAt: new Date(Date.now() + 4 * 24 * 60 * 60 * 1000).toISOString(),
+		reminderEnabled: true,
+		reminderHoursBefore: 24,
+	},
+	{
+		id: 'schedule-cactus',
+		plantId: 'demo-cactus',
+		frequencyDays: 21,
+		lastWateredAt: new Date(Date.now() - 10 * 24 * 60 * 60 * 1000).toISOString(),
+		nextWateringAt: new Date(Date.now() + 11 * 24 * 60 * 60 * 1000).toISOString(),
+		reminderEnabled: true,
+		reminderHoursBefore: 24,
+	},
+];
--- a/apps/planta/apps/web/src/lib/data/local-store.ts
+++ b/apps/planta/apps/web/src/lib/data/local-store.ts
@ -0,0 +1,94 @@
+/**
+ * Planta — Local-First Data Layer
+ *
+ * Plants, watering schedules, and watering logs stored locally.
+ * Photo upload and AI analysis remain server-side.
+ */
+
+import { createLocalStore, type BaseRecord } from '@manacore/local-store';
+import { guestPlants, guestWateringSchedules } from './guest-seed';
+
+// ─── Types ──────────────────────────────────────────────────
+
+export interface LocalPlant extends BaseRecord {
+	name: string;
+	scientificName?: string | null;
+	commonName?: string | null;
+	species?: string | null;
+	lightRequirements?: 'low' | 'medium' | 'bright' | 'direct' | null;
+	wateringFrequencyDays?: number | null;
+	humidity?: 'low' | 'medium' | 'high' | null;
+	temperature?: string | null;
+	soilType?: string | null;
+	careNotes?: string | null;
+	isActive: boolean;
+	healthStatus?: 'healthy' | 'needs_attention' | 'sick' | null;
+	acquiredAt?: string | null;
+}
+
+export interface LocalPlantPhoto extends BaseRecord {
+	plantId: string;
+	storagePath: string;
+	publicUrl?: string | null;
+	filename: string;
+	mimeType?: string | null;
+	fileSize?: number | null;
+	width?: number | null;
+	height?: number | null;
+	isPrimary: boolean;
+	isAnalyzed: boolean;
+	takenAt?: string | null;
+}
+
+export interface LocalWateringSchedule extends BaseRecord {
+	plantId: string;
+	frequencyDays: number;
+	lastWateredAt?: string | null;
+	nextWateringAt?: string | null;
+	reminderEnabled: boolean;
+	reminderHoursBefore: number;
+}
+
+export interface LocalWateringLog extends BaseRecord {
+	plantId: string;
+	wateredAt: string;
+	notes?: string | null;
+}
+
+// ─── Store ──────────────────────────────────────────────────
+
+const SYNC_SERVER_URL = import.meta.env.PUBLIC_SYNC_SERVER_URL || 'http://localhost:3050';
+
+export const plantaStore = createLocalStore({
+	appId: 'planta',
+	collections: [
+		{
+			name: 'plants',
+			indexes: ['isActive', 'healthStatus'],
+			guestSeed: guestPlants,
+		},
+		{
+			name: 'plantPhotos',
+			indexes: ['plantId', 'isPrimary', '[plantId+isPrimary]'],
+		},
+		{
+			name: 'wateringSchedules',
+			indexes: ['plantId', 'nextWateringAt'],
+			guestSeed: guestWateringSchedules,
+		},
+		{
+			name: 'wateringLogs',
+			indexes: ['plantId', 'wateredAt'],
+		},
+	],
+	sync: {
+		serverUrl: SYNC_SERVER_URL,
+	},
+});
+
+// Typed collection accessors
+export const plantCollection = plantaStore.collection<LocalPlant>('plants');
+export const plantPhotoCollection = plantaStore.collection<LocalPlantPhoto>('plantPhotos');
+export const wateringScheduleCollection =
+	plantaStore.collection<LocalWateringSchedule>('wateringSchedules');
+export const wateringLogCollection = plantaStore.collection<LocalWateringLog>('wateringLogs');
--- a/apps/planta/apps/web/src/routes/(app)/+layout.svelte
+++ b/apps/planta/apps/web/src/routes/(app)/+layout.svelte
@ -12,10 +12,14 @@
 		resolvePlantData,
 		formatParsedPlantPreview,
 	} from '$lib/utils/plant-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 { plantaStore } from '$lib/data/local-store';

 	let { children } = $props();

+	let showGuestWelcome = $state(false);
+
 	// TagStrip visibility
 	let isTagStripVisible = $state(false);
 	function handleTagStripToggle() {
@ -95,9 +99,20 @@
 			goto(`/plant/${plant.id}`);
 		}
 	}
+
+	async function handleAuthReady() {
+		await plantaStore.initialize();
+		if (authStore.isAuthenticated) {
+			plantaStore.startSync(() => authStore.getValidToken());
+			await tagStore.fetchTags();
+		}
+		if (!authStore.isAuthenticated && shouldShowGuestWelcome('planta')) {
+			showGuestWelcome = true;
+		}
+	}
 </script>

-<AuthGate {authStore} {goto} onReady={() => tagStore.fetchTags()}>
+<AuthGate {authStore} {goto} allowGuest={true} onReady={handleAuthReady}>
 	<div class="layout-container">
 		<PillNavigation
 			items={navItems}
@ -154,7 +169,18 @@
 			</div>
 		</main>
 	</div>
-	<SessionExpiredBanner locale="de" loginHref="/login" />
+	{#if authStore.isAuthenticated}
+		<SessionExpiredBanner locale="de" loginHref="/login" />
+	{/if}
+
+	<GuestWelcomeModal
+		appId="planta"
+		visible={showGuestWelcome}
+		onClose={() => (showGuestWelcome = false)}
+		onLogin={() => goto('/login')}
+		onRegister={() => goto('/register')}
+		locale="de"
+	/>
 </AuthGate>

 <style>
--- a/apps/presi/apps/web/package.json
+++ b/apps/presi/apps/web/package.json
@ -42,6 +42,7 @@
 		"@manacore/shared-help-types": "workspace:*",
 		"@manacore/shared-help-ui": "workspace:*",
 		"@manacore/shared-icons": "workspace:*",
+		"@manacore/local-store": "workspace:*",
 		"@manacore/shared-profile-ui": "workspace:*",
 		"@manacore/shared-stores": "workspace:*",
 		"@manacore/shared-tags": "workspace:*",
--- a/apps/presi/apps/web/src/lib/data/guest-seed.ts
+++ b/apps/presi/apps/web/src/lib/data/guest-seed.ts
@ -0,0 +1,62 @@
+/**
+ * Guest seed data for the Presi app.
+ *
+ * These records are loaded into IndexedDB when a new guest visits the app.
+ * They serve as onboarding content that teaches the user how the app works.
+ */
+
+import type { LocalDeck, LocalSlide } from './local-store';
+
+const ONBOARDING_DECK_ID = 'onboarding-deck';
+
+export const guestDecks: LocalDeck[] = [
+	{
+		id: ONBOARDING_DECK_ID,
+		title: 'Willkommen bei Presi',
+		description: 'Eine kurze Einführung in die Präsentations-App.',
+		isPublic: false,
+	},
+];
+
+export const guestSlides: LocalSlide[] = [
+	{
+		id: 'slide-1',
+		deckId: ONBOARDING_DECK_ID,
+		order: 1,
+		content: {
+			type: 'title',
+			title: 'Willkommen bei Presi!',
+			subtitle: 'Erstelle Präsentationen direkt im Browser.',
+		},
+	},
+	{
+		id: 'slide-2',
+		deckId: ONBOARDING_DECK_ID,
+		order: 2,
+		content: {
+			type: 'content',
+			title: 'So funktioniert es',
+			bulletPoints: [
+				'Erstelle Decks mit dem + Button',
+				'Füge Slides mit Text, Bildern und Aufzählungen hinzu',
+				'Starte die Präsentation mit dem Play-Button',
+				'Melde dich an, um zu synchronisieren',
+			],
+		},
+	},
+	{
+		id: 'slide-3',
+		deckId: ONBOARDING_DECK_ID,
+		order: 3,
+		content: {
+			type: 'content',
+			title: 'Tastaturkürzel',
+			bulletPoints: [
+				'Pfeiltasten / A+D — Slides navigieren',
+				'F — Vollbild',
+				'ESC — Präsentation beenden',
+				'T — Themes öffnen',
+			],
+		},
+	},
+];
--- a/apps/presi/apps/web/src/lib/data/local-store.ts
+++ b/apps/presi/apps/web/src/lib/data/local-store.ts
@ -0,0 +1,58 @@
+/**
+ * Presi — Local-First Data Layer
+ *
+ * Defines the IndexedDB database, collections, and guest seed data.
+ * This is the single source of truth for all Presi data.
+ */
+
+import { createLocalStore, type BaseRecord } from '@manacore/local-store';
+import { guestDecks, guestSlides } from './guest-seed';
+
+// ─── Types ──────────────────────────────────────────────────
+
+export interface LocalDeck extends BaseRecord {
+	title: string;
+	description?: string | null;
+	themeId?: string | null;
+	isPublic: boolean;
+}
+
+export interface LocalSlide extends BaseRecord {
+	deckId: string;
+	order: number;
+	content: {
+		type: 'title' | 'content' | 'image' | 'split';
+		title?: string;
+		subtitle?: string;
+		body?: string;
+		imageUrl?: string;
+		bulletPoints?: string[];
+	};
+}
+
+// ─── Store ──────────────────────────────────────────────────
+
+const SYNC_SERVER_URL = import.meta.env.PUBLIC_SYNC_SERVER_URL || 'http://localhost:3050';
+
+export const presiStore = createLocalStore({
+	appId: 'presi',
+	collections: [
+		{
+			name: 'decks',
+			indexes: ['isPublic'],
+			guestSeed: guestDecks,
+		},
+		{
+			name: 'slides',
+			indexes: ['deckId', 'order', '[deckId+order]'],
+			guestSeed: guestSlides,
+		},
+	],
+	sync: {
+		serverUrl: SYNC_SERVER_URL,
+	},
+});
+
+// Typed collection accessors
+export const deckCollection = presiStore.collection<LocalDeck>('decks');
+export const slideCollection = presiStore.collection<LocalSlide>('slides');
--- a/apps/presi/apps/web/src/lib/stores/decks.svelte.ts
+++ b/apps/presi/apps/web/src/lib/stores/decks.svelte.ts
@ -1,4 +1,11 @@
-import { decksApi, slidesApi } from '$lib/api/client';
+/**
+ * Decks Store — Local-First with Dexie.js
+ *
+ * All reads and writes go to IndexedDB first.
+ * When authenticated, changes sync to the server in the background.
+ * Same public API as before so components don't need changes.
+ */
+
 import type {
 	Deck,
 	Slide,
@ -7,19 +14,51 @@ import type {
 	CreateSlideDto,
 	UpdateSlideDto,
 } from '@presi/shared';
+import {
+	deckCollection,
+	slideCollection,
+	type LocalDeck,
+	type LocalSlide,
+} from '$lib/data/local-store';
+
+let decks = $state<Deck[]>([]);
+let currentDeck = $state<Deck | null>(null);
+let currentSlides = $state<Slide[]>([]);
+let isLoading = $state(false);
+let error = $state<string | null>(null);
+
+/** Convert LocalDeck (IndexedDB) to shared Deck type. */
+function toDeck(local: LocalDeck): Deck {
+	return {
+		id: local.id,
+		userId: 'local',
+		title: local.title,
+		description: local.description ?? undefined,
+		themeId: local.themeId ?? undefined,
+		isPublic: local.isPublic,
+		createdAt: local.createdAt ?? new Date().toISOString(),
+		updatedAt: local.updatedAt ?? new Date().toISOString(),
+	};
+}
+
+/** Convert LocalSlide (IndexedDB) to shared Slide type. */
+function toSlide(local: LocalSlide): Slide {
+	return {
+		id: local.id,
+		deckId: local.deckId,
+		order: local.order,
+		content: local.content,
+		createdAt: local.createdAt ?? new Date().toISOString(),
+	};
+}

 function createDecksStore() {
-	let decks = $state<Deck[]>([]);
-	let currentDeck = $state<Deck | null>(null);
-	let currentSlides = $state<Slide[]>([]);
-	let isLoading = $state(false);
-	let error = $state<string | null>(null);
-
 	async function loadDecks() {
 		isLoading = true;
 		error = null;
 		try {
-			decks = await decksApi.getAll();
+			const localDecks = await deckCollection.getAll();
+			decks = localDecks.map(toDeck);
 		} catch (e) {
 			error = e instanceof Error ? e.message : 'Failed to load decks';
 			console.error('Failed to load decks:', e);
@ -32,9 +71,15 @@ function createDecksStore() {
 		isLoading = true;
 		error = null;
 		try {
-			const data = await decksApi.getOne(id);
-			currentDeck = data.deck;
-			currentSlides = data.slides.sort((a, b) => a.order - b.order);
+			const localDeck = await deckCollection.get(id);
+			if (localDeck) {
+				currentDeck = toDeck(localDeck);
+			} else {
+				currentDeck = null;
+				throw new Error('Deck not found');
+			}
+			const localSlides = await slideCollection.getAll({ deckId: id });
+			currentSlides = localSlides.map(toSlide).sort((a, b) => a.order - b.order);
 		} catch (e) {
 			error = e instanceof Error ? e.message : 'Failed to load deck';
 			console.error('Failed to load deck:', e);
@ -47,7 +92,15 @@ function createDecksStore() {
 		isLoading = true;
 		error = null;
 		try {
-			const deck = await decksApi.create(dto);
+			const newLocal: LocalDeck = {
+				id: crypto.randomUUID(),
+				title: dto.title,
+				description: dto.description || null,
+				themeId: dto.themeId || null,
+				isPublic: false,
+			};
+			const inserted = await deckCollection.insert(newLocal);
+			const deck = toDeck(inserted);
 			decks = [deck, ...decks];
 			return deck;
 		} catch (e) {
@ -62,10 +115,19 @@ function createDecksStore() {
 	async function updateDeck(id: string, dto: UpdateDeckDto): Promise<boolean> {
 		error = null;
 		try {
-			const updated = await decksApi.update(id, dto);
-			decks = decks.map((d) => (d.id === id ? updated : d));
-			if (currentDeck?.id === id) {
-				currentDeck = updated;
+			const localUpdates: Partial<LocalDeck> = {};
+			if (dto.title !== undefined) localUpdates.title = dto.title;
+			if (dto.description !== undefined) localUpdates.description = dto.description;
+			if (dto.themeId !== undefined) localUpdates.themeId = dto.themeId;
+			if (dto.isPublic !== undefined) localUpdates.isPublic = dto.isPublic;
+
+			const updated = await deckCollection.update(id, localUpdates);
+			if (updated) {
+				const updatedDeck = toDeck(updated);
+				decks = decks.map((d) => (d.id === id ? updatedDeck : d));
+				if (currentDeck?.id === id) {
+					currentDeck = updatedDeck;
+				}
 			}
 			return true;
 		} catch (e) {
@ -78,7 +140,13 @@ function createDecksStore() {
 	async function deleteDeck(id: string): Promise<boolean> {
 		error = null;
 		try {
-			await decksApi.delete(id);
+			// Delete all slides belonging to this deck
+			const slides = await slideCollection.getAll({ deckId: id });
+			for (const slide of slides) {
+				await slideCollection.delete(slide.id);
+			}
+
+			await deckCollection.delete(id);
 			decks = decks.filter((d) => d.id !== id);
 			if (currentDeck?.id === id) {
 				currentDeck = null;
@ -95,7 +163,15 @@ function createDecksStore() {
 	async function createSlide(deckId: string, dto: CreateSlideDto): Promise<Slide | null> {
 		error = null;
 		try {
-			const slide = await slidesApi.create(deckId, dto);
+			const order = dto.order ?? currentSlides.length + 1;
+			const newLocal: LocalSlide = {
+				id: crypto.randomUUID(),
+				deckId,
+				order,
+				content: dto.content,
+			};
+			const inserted = await slideCollection.insert(newLocal);
+			const slide = toSlide(inserted);
 			currentSlides = [...currentSlides, slide].sort((a, b) => a.order - b.order);
 			return slide;
 		} catch (e) {
@ -108,8 +184,16 @@ function createDecksStore() {
 	async function updateSlide(id: string, dto: UpdateSlideDto): Promise<boolean> {
 		error = null;
 		try {
-			const updated = await slidesApi.update(id, dto);
-			currentSlides = currentSlides.map((s) => (s.id === id ? updated : s));
+			const localUpdates: Partial<LocalSlide> = {};
+			if (dto.content !== undefined) localUpdates.content = dto.content;
+			if (dto.order !== undefined) localUpdates.order = dto.order;
+
+			const updated = await slideCollection.update(id, localUpdates);
+			if (updated) {
+				currentSlides = currentSlides
+					.map((s) => (s.id === id ? toSlide(updated) : s))
+					.sort((a, b) => a.order - b.order);
+			}
 			return true;
 		} catch (e) {
 			error = e instanceof Error ? e.message : 'Failed to update slide';
@ -121,7 +205,7 @@ function createDecksStore() {
 	async function deleteSlide(id: string): Promise<boolean> {
 		error = null;
 		try {
-			await slidesApi.delete(id);
+			await slideCollection.delete(id);
 			currentSlides = currentSlides.filter((s) => s.id !== id);
 			return true;
 		} catch (e) {
@ -134,9 +218,10 @@ function createDecksStore() {
 	async function reorderSlides(slides: { id: string; order: number }[]): Promise<boolean> {
 		error = null;
 		try {
-			await slidesApi.reorder({ slides });
-			// Update local state
 			const orderMap = new Map(slides.map((s) => [s.id, s.order]));
+			for (const { id, order } of slides) {
+				await slideCollection.update(id, { order });
+			}
 			currentSlides = currentSlides
 				.map((s) => ({ ...s, order: orderMap.get(s.id) ?? s.order }))
 				.sort((a, b) => a.order - b.order);
--- a/apps/presi/apps/web/src/routes/(app)/+layout.svelte
+++ b/apps/presi/apps/web/src/routes/(app)/+layout.svelte
@ -1,7 +1,6 @@
 <script lang="ts">
 	import { goto } from '$app/navigation';
 	import { page } from '$app/stores';
-	import { onMount } from 'svelte';
 	import { locale } from 'svelte-i18n';
 	import { PillNavigation, QuickInputBar, TagStrip } from '@manacore/shared-ui';
 	import type { PillNavItem, PillDropdownItem, QuickInputItem } from '@manacore/shared-ui';
@ -17,6 +16,9 @@
 	import { decksStore } from '$lib/stores/decks.svelte';
 	import { presiOnboarding } from '$lib/stores/app-onboarding.svelte';
 	import { MiniOnboardingModal } from '@manacore/shared-app-onboarding';
+	import { SessionExpiredBanner, AuthGate, GuestWelcomeModal } from '@manacore/shared-auth-ui';
+	import { shouldShowGuestWelcome } from '@manacore/shared-auth-ui';
+	import { presiStore } from '$lib/data/local-store';

 	// App switcher items
 	const appItems = getPillAppItems('presi');
@ -25,6 +27,12 @@

 	let isCollapsed = $state(false);

+	// Guest welcome modal state
+	let showGuestWelcome = $state(false);
+
+	// User email for user dropdown — empty string for guests so PillNav shows login button
+	let userEmail = $derived(auth.isAuthenticated ? auth.user?.email || 'Menü' : '');
+
 	// Theme variant dropdown items
 	let themeVariantItems = $derived<PillDropdownItem[]>([
 		...theme.variants.map((variant) => ({
@ -56,9 +64,6 @@
 	);
 	let currentLanguageLabel = $derived(getCurrentLanguageLabel(currentLocale));

-	// User email for user dropdown
-	let userEmail = $derived(auth.user?.email);
-
 	// TagStrip visibility
 	let isTagStripVisible = $state(false);
 	function handleTagStripToggle() {
@ -137,16 +142,28 @@
 		goto(`/deck/${item.id}`);
 	}

-	onMount(async () => {
-		// Redirect to login if not authenticated
-		if (!auth.isAuthenticated) {
-			goto('/login');
-			return;
+	async function handleAuthReady() {
+		// Initialize local-first database (opens IndexedDB, seeds guest data)
+		await presiStore.initialize();
+
+		// If authenticated, start syncing to server
+		if (auth.isAuthenticated) {
+			presiStore.startSync(() => auth.getValidToken());
 		}

-		// Load user settings and tags
-		await userSettings.load();
-		await tagStore.fetchTags();
+		// Load decks from IndexedDB (guest seed or synced data)
+		await decksStore.loadDecks();
+
+		// Show guest welcome modal on first visit
+		if (!auth.isAuthenticated && shouldShowGuestWelcome('presi')) {
+			showGuestWelcome = true;
+		}
+
+		if (auth.isAuthenticated) {
+			// Load user settings and tags (require auth)
+			await userSettings.load();
+			await tagStore.fetchTags();
+		}

 		// Redirect to start page if on root and a custom start page is set
 		const currentPath = window.location.pathname;
@ -160,7 +177,7 @@
 			isCollapsed = true;
 			collapsedStore.set(true);
 		}
-	});
+	}
 </script>

 <svelte:window onkeydown={handleKeydown} />
@ -171,81 +188,98 @@
 		{@render children()}
 	</main>
 {:else}
-	<!-- Navigation Layout -->
-	<div class="layout-container">
-		<!-- Floating Pill Navigation -->
-		<PillNavigation
-			items={navItems}
-			currentPath={$page.url.pathname}
-			appName="Presi"
-			homeRoute="/"
-			onToggleTheme={handleToggleTheme}
-			isDark={theme.isDark}
-			{isCollapsed}
-			onCollapsedChange={handleCollapsedChange}
-			showThemeToggle={true}
-			showThemeVariants={true}
-			{themeVariantItems}
-			{currentThemeVariantLabel}
-			themeMode={theme.mode}
-			onThemeModeChange={handleThemeModeChange}
-			showLanguageSwitcher={true}
-			{languageItems}
-			{currentLanguageLabel}
-			showLogout={true}
-			onLogout={handleLogout}
-			primaryColor="#64748b"
-			showAppSwitcher={true}
-			{appItems}
-			{userEmail}
-			settingsHref="/settings"
-			manaHref="/mana"
-			profileHref="/profile"
-			themesHref="/themes"
-			helpHref="/help"
-			allAppsHref="/apps"
-		/>
-
-		<!-- TagStrip (above PillNav, toggled via Tags pill) -->
-		{#if isTagStripVisible}
-			<TagStrip
-				tags={tagStore.tags.map((t) => ({
-					id: t.id,
-					name: t.name,
-					color: t.color || '#3b82f6',
-				}))}
-				selectedIds={[]}
-				onToggle={() => {}}
-				onClear={() => {}}
-				managementHref="/tags"
-				loading={tagStore.loading}
+	<AuthGate authStore={auth} {goto} allowGuest={true} onReady={handleAuthReady}>
+		<!-- Navigation Layout -->
+		<div class="layout-container">
+			<!-- Floating Pill Navigation -->
+			<PillNavigation
+				items={navItems}
+				currentPath={$page.url.pathname}
+				appName="Presi"
+				homeRoute="/"
+				onToggleTheme={handleToggleTheme}
+				isDark={theme.isDark}
+				{isCollapsed}
+				onCollapsedChange={handleCollapsedChange}
+				showThemeToggle={true}
+				showThemeVariants={true}
+				{themeVariantItems}
+				{currentThemeVariantLabel}
+				themeMode={theme.mode}
+				onThemeModeChange={handleThemeModeChange}
+				showLanguageSwitcher={true}
+				{languageItems}
+				{currentLanguageLabel}
+				showLogout={auth.isAuthenticated}
+				onLogout={handleLogout}
+				loginHref="/login"
+				primaryColor="#64748b"
+				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}
+
+			<!-- Quick Input Bar -->
+			<QuickInputBar
+				onSearch={handleInputSearch}
+				onSelect={handleInputSelect}
+				placeholder="Präsentation suchen..."
+				emptyText="Keine Decks gefunden"
+				searchingText="Suche..."
+				locale={$locale || 'de'}
+				appIcon="search"
+				bottomOffset="70px"
+			/>
+
+			<!-- Main Content -->
+			<main class="main-content">
+				<div class="content-wrapper">
+					{@render children()}
+				</div>
+			</main>
+		</div>
+
+		<!-- Onboarding Modal -->
+		{#if presiOnboarding.shouldShow}
+			<MiniOnboardingModal store={presiOnboarding} appName="Presi" appEmoji="📊" />
 		{/if}

-		<!-- Quick Input Bar -->
-		<QuickInputBar
-			onSearch={handleInputSearch}
-			onSelect={handleInputSelect}
-			placeholder="Präsentation suchen..."
-			emptyText="Keine Decks gefunden"
-			searchingText="Suche..."
-			locale={$locale || 'de'}
-			appIcon="search"
-			bottomOffset="70px"
+		<!-- Guest Welcome Modal -->
+		<GuestWelcomeModal
+			appId="presi"
+			visible={showGuestWelcome}
+			onClose={() => (showGuestWelcome = false)}
+			onLogin={() => goto('/login')}
+			onRegister={() => goto('/register')}
+			locale={($locale || 'de') === 'de' ? 'de' : 'en'}
 		/>

-		<!-- Main Content -->
-		<main class="main-content">
-			<div class="content-wrapper">
-				{@render children()}
-			</div>
-		</main>
-	</div>
-
-	<!-- Onboarding Modal -->
-	{#if presiOnboarding.shouldShow}
-		<MiniOnboardingModal store={presiOnboarding} appName="Presi" appEmoji="📊" />
-	{/if}
+		{#if auth.isAuthenticated}
+			<SessionExpiredBanner locale={$locale || 'de'} loginHref="/login" />
+		{/if}
+	</AuthGate>
 {/if}

 <style>
--- a/apps/presi/apps/web/src/routes/(app)/+page.svelte
+++ b/apps/presi/apps/web/src/routes/(app)/+page.svelte
@ -1,5 +1,4 @@
 <script lang="ts">
-	import { onMount } from 'svelte';
 	import { goto } from '$app/navigation';
 	import { decksStore } from '$lib/stores/decks.svelte';
 	import { PresiEvents } from '@manacore/shared-utils/analytics';
@ -60,10 +59,6 @@
 		];
 	}

-	onMount(() => {
-		decksStore.loadDecks();
-	});
-
 	async function handleCreateDeck(e: SubmitEvent) {
 		e.preventDefault();
 		if (!newDeckTitle.trim()) return;
--- a/apps/presi/apps/web/src/routes/(app)/deck/[id]/+page.svelte
+++ b/apps/presi/apps/web/src/routes/(app)/deck/[id]/+page.svelte
@ -4,6 +4,7 @@
 	import { goto } from '$app/navigation';
 	import { browser } from '$app/environment';
 	import { decksStore } from '$lib/stores/decks.svelte';
+	import { auth } from '$lib/stores/auth.svelte';
 	import { PresiEvents } from '@manacore/shared-utils/analytics';
 	import { shareApi } from '$lib/api/client';
 	import type { ShareLink } from '$lib/api/client';
@ -254,13 +255,15 @@
 					<Plus class="w-5 h-5" />
 					Add Slide
 				</button>
-				<button
-					onclick={openShareModal}
-					class="flex items-center gap-2 px-4 py-2 bg-slate-100 dark:bg-slate-700 hover:bg-slate-200 dark:hover:bg-slate-600 text-slate-700 dark:text-slate-200 font-medium rounded-lg transition-colors"
-				>
-					<ShareNetwork class="w-5 h-5" />
-					Share
-				</button>
+				{#if auth.isAuthenticated}
+					<button
+						onclick={openShareModal}
+						class="flex items-center gap-2 px-4 py-2 bg-slate-100 dark:bg-slate-700 hover:bg-slate-200 dark:hover:bg-slate-600 text-slate-700 dark:text-slate-200 font-medium rounded-lg transition-colors"
+					>
+						<ShareNetwork class="w-5 h-5" />
+						Share
+					</button>
+				{/if}
 				{#if decksStore.currentSlides.length > 0}
 					<a
 						href="/present/{deckId}"
--- a/apps/storage/apps/web/package.json
+++ b/apps/storage/apps/web/package.json
@ -49,6 +49,7 @@
 		"@manacore/shared-help-types": "workspace:*",
 		"@manacore/shared-help-ui": "workspace:*",
 		"@manacore/shared-icons": "workspace:*",
+		"@manacore/local-store": "workspace:*",
 		"@manacore/shared-profile-ui": "workspace:*",
 		"@manacore/shared-stores": "workspace:*",
 		"@manacore/shared-subscription-ui": "workspace:*",
--- a/apps/storage/apps/web/src/lib/data/guest-seed.ts
+++ b/apps/storage/apps/web/src/lib/data/guest-seed.ts
@ -0,0 +1,58 @@
+/**
+ * Guest seed data for the Storage app.
+ *
+ * Provides demo folders and tags for the onboarding experience.
+ */
+
+import type { LocalFolder, LocalTag } from './local-store';
+
+export const guestFolders: LocalFolder[] = [
+	{
+		id: 'folder-documents',
+		name: 'Dokumente',
+		description: 'Wichtige Dokumente',
+		color: '#3b82f6',
+		path: '/folder-documents',
+		depth: 0,
+		isFavorite: false,
+		isDeleted: false,
+	},
+	{
+		id: 'folder-photos',
+		name: 'Fotos',
+		description: 'Fotosammlung',
+		color: '#22c55e',
+		path: '/folder-photos',
+		depth: 0,
+		isFavorite: true,
+		isDeleted: false,
+	},
+	{
+		id: 'folder-music',
+		name: 'Musik',
+		description: 'Audio-Dateien',
+		color: '#a855f7',
+		path: '/folder-music',
+		depth: 0,
+		isFavorite: false,
+		isDeleted: false,
+	},
+];
+
+export const guestTags: LocalTag[] = [
+	{
+		id: 'tag-important',
+		name: 'Wichtig',
+		color: '#ef4444',
+	},
+	{
+		id: 'tag-work',
+		name: 'Arbeit',
+		color: '#3b82f6',
+	},
+	{
+		id: 'tag-personal',
+		name: 'Privat',
+		color: '#22c55e',
+	},
+];
--- a/apps/storage/apps/web/src/lib/data/local-store.ts
+++ b/apps/storage/apps/web/src/lib/data/local-store.ts
@ -0,0 +1,84 @@
+/**
+ * Storage — Local-First Data Layer
+ *
+ * File/folder metadata, tags, and favorites stored locally.
+ * Actual file upload/download, shares, and versions remain server-side.
+ */
+
+import { createLocalStore, type BaseRecord } from '@manacore/local-store';
+import { guestFolders, guestTags } from './guest-seed';
+
+// ─── Types ──────────────────────────────────────────────────
+
+export interface LocalFile extends BaseRecord {
+	name: string;
+	originalName: string;
+	mimeType: string;
+	size: number;
+	storagePath: string;
+	storageKey: string;
+	parentFolderId?: string | null;
+	currentVersion: number;
+	isFavorite: boolean;
+	isDeleted: boolean;
+	checksum?: string | null;
+	thumbnailPath?: string | null;
+}
+
+export interface LocalFolder extends BaseRecord {
+	name: string;
+	description?: string | null;
+	color?: string | null;
+	parentFolderId?: string | null;
+	path: string;
+	depth: number;
+	isFavorite: boolean;
+	isDeleted: boolean;
+}
+
+export interface LocalTag extends BaseRecord {
+	name: string;
+	color?: string | null;
+}
+
+export interface LocalFileTag extends BaseRecord {
+	fileId: string;
+	tagId: string;
+}
+
+// ─── Store ──────────────────────────────────────────────────
+
+const SYNC_SERVER_URL = import.meta.env.PUBLIC_SYNC_SERVER_URL || 'http://localhost:3050';
+
+export const storageStore = createLocalStore({
+	appId: 'storage',
+	collections: [
+		{
+			name: 'files',
+			indexes: ['parentFolderId', 'mimeType', 'isFavorite', 'isDeleted', 'name'],
+		},
+		{
+			name: 'folders',
+			indexes: ['parentFolderId', 'path', 'depth', 'isFavorite', 'isDeleted'],
+			guestSeed: guestFolders,
+		},
+		{
+			name: 'tags',
+			indexes: ['name'],
+			guestSeed: guestTags,
+		},
+		{
+			name: 'fileTags',
+			indexes: ['fileId', 'tagId', '[fileId+tagId]'],
+		},
+	],
+	sync: {
+		serverUrl: SYNC_SERVER_URL,
+	},
+});
+
+// Typed collection accessors
+export const fileCollection = storageStore.collection<LocalFile>('files');
+export const folderCollection = storageStore.collection<LocalFolder>('folders');
+export const tagCollection = storageStore.collection<LocalTag>('tags');
+export const fileTagCollection = storageStore.collection<LocalFileTag>('fileTags');
--- a/apps/storage/apps/web/src/routes/+layout.svelte
+++ b/apps/storage/apps/web/src/routes/+layout.svelte
@ -17,7 +17,9 @@
 	import { ToastContainer } from '@manacore/shared-ui';
 	import { storageOnboarding } from '$lib/stores/app-onboarding.svelte';
 	import { MiniOnboardingModal } from '@manacore/shared-app-onboarding';
-	import { SessionExpiredBanner, AuthGate } from '@manacore/shared-auth-ui';
+	import { SessionExpiredBanner, AuthGate, GuestWelcomeModal } from '@manacore/shared-auth-ui';
+	import { shouldShowGuestWelcome } from '@manacore/shared-auth-ui';
+	import { storageStore } from '$lib/data/local-store';
 	import MiniPlayer from '$lib/components/audio/MiniPlayer.svelte';
 	import FullPlayer from '$lib/components/audio/FullPlayer.svelte';
 	import '../app.css';
@ -63,8 +65,11 @@
 	);
 	let currentLanguageLabel = $derived(getCurrentLanguageLabel(currentLocale));

-	// User email for user dropdown
-	let userEmail = $derived(authStore.user?.email || 'Menü');
+	// User email for user dropdown — empty string for guests so PillNav shows login button
+	let userEmail = $derived(authStore.isAuthenticated ? authStore.user?.email || 'Menü' : '');
+
+	// Guest welcome modal state
+	let showGuestWelcome = $state(false);

 	// TagStrip state
 	let isTagStripVisible = $state(true);
@ -160,11 +165,26 @@
 	}

 	async function handleAuthReady() {
+		// Initialize local-first database
+		await storageStore.initialize();
+
+		// If authenticated, start syncing
+		if (authStore.isAuthenticated) {
+			storageStore.startSync(() => authStore.getValidToken());
+		}
+
 		// Initialize theme
 		theme.initialize();

-		// Load user settings and tags
-		await Promise.all([userSettings.load(), tagsStore.fetchTags()]);
+		// Show guest welcome on first visit
+		if (!authStore.isAuthenticated && shouldShowGuestWelcome('storage')) {
+			showGuestWelcome = true;
+		}
+
+		if (authStore.isAuthenticated) {
+			// Load user settings and tags (require auth)
+			await Promise.all([userSettings.load(), tagsStore.fetchTags()]);
+		}

 		// Initialize collapsed state from localStorage
 		const savedCollapsed = localStorage.getItem('storage-nav-collapsed');
@ -252,12 +272,24 @@
 			<MiniOnboardingModal store={storageOnboarding} appName="Storage" appEmoji="☁️" />
 		{/if}

-		<SessionExpiredBanner locale={$locale || 'de'} loginHref="/login" />
+		{#if authStore.isAuthenticated}
+			<SessionExpiredBanner locale={$locale || 'de'} loginHref="/login" />
+		{/if}

 		<!-- Audio Player -->
 		<MiniPlayer />
 		<FullPlayer />
 	{/if}
+
+	<!-- Guest Welcome Modal -->
+	<GuestWelcomeModal
+		appId="storage"
+		visible={showGuestWelcome}
+		onClose={() => (showGuestWelcome = false)}
+		onLogin={() => goto('/login')}
+		onRegister={() => goto('/register')}
+		locale={($locale || 'de') === 'de' ? 'de' : 'en'}
+	/>
 </AuthGate>

 <style>