feat(local-first): migrate tags + task stores to reactive liveQuery across all apps

- Todo: Replace manual fetch/state stores with useLiveQuery() for tasks,
  projects, and tags. Components use Svelte context instead of store imports.
  Stores reduced to mutation-only services. Removes ~200 lines of manual
  state management. Enables multi-tab sync and auto-refresh on data changes.

- Tags (all 16 apps): Migrate from API-based createTagStore() to shared
  local-first IndexedDB ('manacore-tags'). Tags now work offline and in
  guest mode with default seed data. All apps share the same tag DB via
  tagLocalStore + useAllTags() + setContext pattern.

- Cleanup: Delete unused Todo API files (projects.ts, labels.ts,
  reminders.ts), remove dead labels store, clean up barrel exports.

Apps migrated: Todo, Zitare, Questions, Planta, Clock, Presi, Mukke,
Context, CityCorners, ManaDeck, Chat, Contacts, Calendar, Picture,
Storage, Photos

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/clock/apps/web/src/lib/stores/tags.svelte.ts

@@ -1,20 +1,13 @@
 /**
- * Tag Store - Uses shared createTagStore backed by central mana-core-auth
+ * Tag Store — Local-First via Shared Tag Store
+ * Tags are stored in shared IndexedDB ('manacore-tags'), accessible across all apps.
+ * Use context ('tags') for reads, tagMutations for writes.
  */
-import { browser } from '$app/environment';
-import { createTagStore } from '@manacore/shared-stores';
-import { authStore } from '$lib/stores/auth.svelte';
-
-function getAuthUrl(): string {
-	if (browser && typeof window !== 'undefined') {
-		const injectedUrl = (window as unknown as { __PUBLIC_MANA_CORE_AUTH_URL__?: string })
-			.__PUBLIC_MANA_CORE_AUTH_URL__;
-		return injectedUrl || 'http://localhost:3001';
-	}
-	return 'http://localhost:3001';
-}
-
-export const tagStore = createTagStore({
-	authUrl: getAuthUrl(),
-	getToken: () => authStore.getValidToken(),
-});
+export {
+	tagMutations,
+	useAllTags,
+	getTagById,
+	getTagsByIds,
+	getTagColor,
+	getTagsByGroup,
+} from '@manacore/shared-stores';

apps/clock/apps/web/src/routes/(app)/tags/+page.svelte

@@ -1,12 +1,10 @@
 <script lang="ts">
-	import { tagStore } from '$lib/stores/tags.svelte';
-	import { onMount } from 'svelte';
+	import { getContext } from 'svelte';
+	import { tagMutations } from '@manacore/shared-stores';
+	import type { Tag } from '@manacore/shared-tags';
 
-	onMount(() => {
-		if (tagStore.tags.length === 0) {
-			tagStore.fetchTags();
-		}
-	});
+	// Live tags from layout context
+	const tagsCtx: { readonly value: Tag[] } = getContext('tags');
 </script>
 
 <svelte:head>
@@ -19,13 +17,11 @@
 		Tags sind app-übergreifend — Änderungen gelten in allen ManaCore-Apps.
 	</p>
 
-	{#if tagStore.loading}
-		<p>Lädt...</p>
-	{:else if tagStore.tags.length === 0}
+	{#if tagsCtx.value.length === 0}
 		<p>Keine Tags vorhanden.</p>
 	{:else}
 		<div class="grid gap-2">
-			{#each tagStore.tags as tag}
+			{#each tagsCtx.value as tag}
 				<div class="flex items-center gap-2 p-2 rounded-lg bg-card">
 					<span class="w-3 h-3 rounded-full" style="background-color: {tag.color}"></span>
 					<span>{tag.name}</span>