feat: unify QuickInputBar across all apps with locale + deferSearch

- Add `locale` prop to all 6 apps using QuickInputBar
  (todo, contacts, zitare, citycorners, questions, calendar)
- Enable `deferSearch` on apps with create flow
  (contacts, zitare, questions) to match todo behavior
- Pass locale through Calendar's UnifiedBar wrapper
- Questions: default to 'en' locale (English-first app)

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

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

@@ -273,6 +273,8 @@
 			emptyText={$_('search.noResults')}
 			searchingText={$_('search.searching')}
 			createText={$_('search.create')}
+			deferSearch={true}
+			locale={$locale || 'de'}
 			appIcon="quote"
 			bottomOffset={inputBarBottomOffset}
 			hasFabRight={true}