feat(writing): register Writing as a Workbench card

Writing is now pickable from the Workbench AppPagePicker and can run
side-by-side with the other module cards. Previously only reachable via
direct navigation to /writing.

- app-registry: registerApp({ id: 'writing', icon: NotePencil, color:
  '#0ea5e9', list: ListView }) with a "Neuer Draft" context-menu action
  that dispatches mana:quick-action (same convention as library/notes/
  quiz — the event channel is the standard cross-card hook).
- writing ListView: onMount listener for the mana:quick-action event
  flips showCreate=true when { app:'writing', action:'new' } fires, so
  the kebab menu → "Neuer Draft" opens the inline BriefingForm instead
  of being a no-op.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/mana/apps/web/src/lib/app-registry/apps.ts

@@ -1,3 +1,4 @@
+import { formatDate } from '$lib/i18n/format';
 /**
  * Unified App Registrations — All app descriptors in one file.
  *
@@ -79,6 +80,7 @@ import {
 	Exam,
 	Globe,
 	CoatHanger,
+	NotePencil,
 } from '@mana/shared-icons';
 
 // ── Apps with entity capabilities ───────────────────────────
@@ -119,7 +121,7 @@ registerApp({
 	},
 	getDisplayData: (item) => ({
 		title: (item.title as string) || 'Aufgabe',
-		subtitle: item.dueDate ? new Date(item.dueDate as string).toLocaleDateString('de') : undefined,
+		subtitle: item.dueDate ? formatDate(new Date(item.dueDate as string)) : undefined,
 	}),
 	createItem: async (data) => {
 		const { tasksStore } = await import('$lib/modules/todo/stores/tasks.svelte');
@@ -180,7 +182,7 @@ registerApp({
 	getDisplayData: (item) => ({
 		title: (item.title as string) || 'Termin',
 		subtitle: item.startDate
-			? new Date(item.startDate as string).toLocaleDateString('de', {
+			? formatDate(new Date(item.startDate as string), {
 					day: '2-digit',
 					month: '2-digit',
 					hour: '2-digit',
@@ -1330,6 +1332,29 @@ registerApp({
 	],
 });
 
+registerApp({
+	id: 'writing',
+	name: 'Writing',
+	color: '#0ea5e9',
+	icon: NotePencil,
+	views: {
+		// Detail view (/writing/draft/[id]) uses goto() from the list view,
+		// same pattern as library. Workbench detail-slot not wired yet.
+		list: { load: () => import('$lib/modules/writing/ListView.svelte') },
+	},
+	contextMenuActions: [
+		{
+			id: 'new-draft',
+			label: 'Neuer Draft',
+			icon: Plus,
+			action: () =>
+				window.dispatchEvent(
+					new CustomEvent('mana:quick-action', { detail: { app: 'writing', action: 'new' } })
+				),
+		},
+	],
+});
+
 registerApp({
 	id: 'spaces',
 	name: 'Spaces',

apps/mana/apps/web/src/lib/modules/writing/views/ListView.svelte

@@ -6,6 +6,7 @@
   unstarted draft.
 -->
 <script lang="ts">
+	import { onMount } from 'svelte';
 	import { goto } from '$app/navigation';
 	import KindTabs from '../components/KindTabs.svelte';
 	import StatusFilter from '../components/StatusFilter.svelte';
@@ -86,6 +87,21 @@
 		showCreate = false;
 		openDraft(d);
 	}
+
+	// Workbench "Neuer Draft" context-menu action. Uses the shared
+	// mana:quick-action event channel that the app-registry dispatches
+	// from the card's kebab menu. Also fires when the user picks the
+	// action from the command palette once that's wired up globally.
+	onMount(() => {
+		function handleQuickAction(ev: Event) {
+			const detail = (ev as CustomEvent<{ app?: string; action?: string }>).detail;
+			if (detail?.app === 'writing' && detail?.action === 'new') {
+				showCreate = true;
+			}
+		}
+		window.addEventListener('mana:quick-action', handleQuickAction);
+		return () => window.removeEventListener('mana:quick-action', handleQuickAction);
+	});
 </script>
 
 <div class="writing-shell">