feat(zitare): add vertical scroll-snap quote feed with infinite scroll

- Replace single quote view with TikTok-style vertical scrolling feed
- Add infinite scroll to load more quotes as user scrolls
- Remove discover page (consolidated into homepage)
- Fix theme store to use appId instead of storagePrefix
- Fix Sidebar theme toggle to use toggleMode() and isDark
- Add zitare and picture branding to shared-branding config
- Add missing manacore, mana, moodlit URLs to APP_URLS

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

COMMANDS.md

@@ -11,6 +11,8 @@ pnpm dev:picture:app
 
 pnpm dev:manacore:app
 
+pnpm dev:zitare:app
+
 
 
 Übersicht aller wichtigen Befehle zum Starten, Stoppen und Verwalten der Apps.