feat(apps): add unified Apps page and PillNavigation to all web apps

- Add AppsPage component to shared-ui for displaying all Mana apps
- Add allAppsHref prop to PillNavigation with "Alle Apps" link in dropdown
- Integrate PillNavigation in archived apps (maerchenzauber, news, uload, wisekeep)
- Add /apps route to all web apps (active and archived)
- Replace custom sidebars/headers with unified PillNavigation

Apps updated:
- Active: chat, manacore, manadeck, picture, presi, zitare
- Archived: maerchenzauber, memoro, news, nutriphi, uload, wisekeep

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

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

packages/shared-ui/package.json

@@ -32,6 +32,7 @@
 		"svelte": "^5.0.0"
 	},
 	"dependencies": {
+		"@manacore/shared-branding": "workspace:*",
 		"@manacore/shared-icons": "workspace:*"
 	}
 }