fix(UI-Overhaul-Phase1): 7 Bugs behoben

1.1 Contacts refresh: useUnifiedContacts mutations already invalidate (verified)
1.2 Contacts drag-drop: ContactList items already draggable + ContactFolderTree onDrop (verified)
1.3 Contacts move dialog: Added move-to-folder dropdown in ContactDetail
1.4 Wiki save refresh: Added refreshKey prop to WikiBrowser, triggers reload after save/delete
1.5 Calendar dialog close: Window.tsx now injects windowId into componentProps
1.6 Communication AI chat: Added metadata support to ConversationCreate schema + service,
    frontend passes conversation_type metadata for AI/system chats,
    categorization checks metadata first
1.7 Wiki duplicate menu: Removed hardcoded /wiki from Sidebar.tsx (plugin provides it dynamically)

Backend: kommunikation schema/routes/services updated for metadata support
Frontend: tsc clean, build successful

frontend/src/components/wiki/WikiBrowser.tsx

@@ -18,6 +18,7 @@ import { EmptyState } from '@/components/ui/EmptyState';
 interface WikiBrowserProps {
   selectedArticleId: string | null;
   onSelectArticle: (article: WikiArticle) => void;
+  refreshKey?: number;
 }
 
 interface CategoryNode {
@@ -110,7 +111,7 @@ function CategoryNodeItem({
   );
 }
 
-export function WikiBrowser({ selectedArticleId, onSelectArticle }: WikiBrowserProps) {
+export function WikiBrowser({ selectedArticleId, onSelectArticle, refreshKey }: WikiBrowserProps) {
   const { t } = useTranslation();
   const [categories, setCategories] = useState<WikiCategory[]>([]);
   const [articles, setArticles] = useState<WikiArticle[]>([]);
@@ -135,7 +136,7 @@ export function WikiBrowser({ selectedArticleId, onSelectArticle }: WikiBrowserP
     } finally {
       setLoading(false);
     }
-  }, [selectedCategoryId, search, t]);
+  }, [selectedCategoryId, search, t, refreshKey]);
 
   useEffect(() => {
     void load();