feat(ui): add SyncIndicator to all 19 app layouts

Add <SyncIndicator /> from @manacore/shared-ui to every app layout.
Shows floating pill when browser goes offline ("Offline") and briefly
when reconnecting ("Wieder online"). Auto-fades after 3 seconds.

Simplified component: uses browser online/offline events instead of
sync engine coupling. Works universally without any props.

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

apps/questions/apps/web/src/routes/(app)/+layout.svelte

@@ -16,6 +16,7 @@
 		searchQuestions,
 	} from '$lib/data/queries';
 	import { PillNavigation, QuickInputBar, TagStrip } from '@manacore/shared-ui';
+	import { SyncIndicator } from '@manacore/shared-ui';
 	import type {
 		PillNavItem,
 		PillDropdownItem,
@@ -262,6 +263,7 @@
 		onRegister={() => goto('/register')}
 		locale="de"
 	/>
+	<SyncIndicator />
 </AuthGate>
 
 <style>