refactor(shared-help): extract shared translations, add Zitare + Mukke help pages

- Add defaultTranslationsDE/EN and getHelpTranslations() to shared-help-ui
  so apps only need to override the subtitle instead of duplicating ~80 lines
- Refactor all 6 existing help pages to use getHelpTranslations()
  (Contacts, Calendar, Todo, Storage, Chat, Picture)
- Add help page to Zitare (FAQ, features, contact — no shortcuts)
- Migrate Mukke from custom SettingsPage-based help to shared HelpPage
  (FAQ with audio formats, lyrics editor, playlists; features; shortcuts)

All 8 web apps now use the unified shared help system.

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

apps/chat/apps/web/src/routes/(protected)/help/+page.svelte

@@ -1,142 +1,17 @@
 <script lang="ts">
 	import { goto } from '$app/navigation';
 	import { locale } from 'svelte-i18n';
-	import { HelpPage } from '@manacore/shared-help-ui';
-	import type { HelpPageTranslations } from '@manacore/shared-help-ui';
+	import { HelpPage, getHelpTranslations } from '@manacore/shared-help-ui';
 	import { getChatHelpContent } from '$lib/content/help/index.js';
 
 	const content = $derived(getChatHelpContent($locale ?? 'de'));
-
-	const translations: HelpPageTranslations = $derived(
-		$locale === 'de'
-			? {
-					title: 'Hilfe & Support',
-					subtitle: 'Finde Antworten und lerne Chat kennen',
-					searchPlaceholder: 'Hilfe durchsuchen...',
-					sections: {
-						faq: 'FAQ',
-						features: 'Features',
-						shortcuts: 'Tastenkürzel',
-						gettingStarted: 'Erste Schritte',
-						changelog: 'Änderungen',
-						contact: 'Kontakt',
-					},
-					search: {
-						noResults: 'Keine Ergebnisse für "{query}"',
-						resultsCount: '{count} Ergebnisse',
-						searching: 'Suche...',
-					},
-					faq: {
-						noItems: 'Keine häufigen Fragen verfügbar.',
-						allCategories: 'Alle',
-						categories: {
-							general: 'Allgemein',
-							account: 'Konto',
-							billing: 'Abrechnung',
-							features: 'Funktionen',
-							technical: 'Technisch',
-							privacy: 'Datenschutz',
-						},
-					},
-					features: {
-						noItems: 'Keine Features verfügbar.',
-						comingSoon: 'Demnächst',
-						learnMore: 'Mehr erfahren',
-					},
-					shortcuts: {
-						noItems: 'Keine Tastenkürzel verfügbar.',
-						columns: { shortcut: 'Kürzel', action: 'Aktion', description: 'Beschreibung' },
-					},
-					gettingStarted: {
-						noItems: 'Keine Anleitungen verfügbar.',
-						estimatedTime: 'Geschätzte Zeit',
-						difficulty: {
-							beginner: 'Einsteiger',
-							intermediate: 'Fortgeschritten',
-							advanced: 'Experte',
-						},
-					},
-					changelog: {
-						noItems: 'Keine Änderungen verfügbar.',
-						showAll: 'Alle Versionen anzeigen',
-						types: { major: 'Hauptversion', minor: 'Nebenversion', patch: 'Patch', beta: 'Beta' },
-						labels: {
-							features: 'Neue Funktionen',
-							improvements: 'Verbesserungen',
-							bugFixes: 'Fehlerbehebungen',
-						},
-					},
-					contact: {
-						noInfo: 'Keine Kontaktinformationen verfügbar.',
-						email: 'E-Mail senden',
-						responseTime: 'Antwortzeit',
-					},
-					common: { back: 'Zurück', showMore: 'Mehr anzeigen', showLess: 'Weniger anzeigen' },
-				}
-			: {
-					title: 'Help & Support',
-					subtitle: 'Find answers and learn how to use Chat',
-					searchPlaceholder: 'Search help...',
-					sections: {
-						faq: 'FAQ',
-						features: 'Features',
-						shortcuts: 'Shortcuts',
-						gettingStarted: 'Getting Started',
-						changelog: 'Changelog',
-						contact: 'Contact',
-					},
-					search: {
-						noResults: 'No results for "{query}"',
-						resultsCount: '{count} results',
-						searching: 'Searching...',
-					},
-					faq: {
-						noItems: 'No FAQs available.',
-						allCategories: 'All',
-						categories: {
-							general: 'General',
-							account: 'Account',
-							billing: 'Billing',
-							features: 'Features',
-							technical: 'Technical',
-							privacy: 'Privacy',
-						},
-					},
-					features: {
-						noItems: 'No features available.',
-						comingSoon: 'Coming Soon',
-						learnMore: 'Learn More',
-					},
-					shortcuts: {
-						noItems: 'No shortcuts available.',
-						columns: { shortcut: 'Shortcut', action: 'Action', description: 'Description' },
-					},
-					gettingStarted: {
-						noItems: 'No guides available.',
-						estimatedTime: 'Estimated time',
-						difficulty: {
-							beginner: 'Beginner',
-							intermediate: 'Intermediate',
-							advanced: 'Advanced',
-						},
-					},
-					changelog: {
-						noItems: 'No changelog available.',
-						showAll: 'Show all releases',
-						types: { major: 'Major', minor: 'Minor', patch: 'Patch', beta: 'Beta' },
-						labels: {
-							features: 'New Features',
-							improvements: 'Improvements',
-							bugFixes: 'Bug Fixes',
-						},
-					},
-					contact: {
-						noInfo: 'No contact info available.',
-						email: 'Send email',
-						responseTime: 'Response time',
-					},
-					common: { back: 'Back', showMore: 'Show more', showLess: 'Show less' },
-				}
+	const translations = $derived(
+		getHelpTranslations($locale ?? 'de', {
+			subtitle:
+				$locale === 'de'
+					? 'Finde Antworten und lerne Chat kennen'
+					: 'Find answers and learn how to use Chat',
+		})
 	);
 </script>