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/contacts/ContactDetail.tsx

@@ -1,5 +1,5 @@
 import { asError } from '@/utils/errorTypes';
-import React, { useState, useEffect, useMemo } from 'react';
+import React, { useState, useEffect, useMemo, useRef } from 'react';
 import { useTranslation } from 'react-i18next';
 import { Button } from '@/components/ui/Button';
 import { Badge } from '@/components/ui/Badge';
@@ -8,7 +8,7 @@ import { Modal } from '@/components/ui/Modal';
 import { Input } from '@/components/ui/Input';
 import { useToast } from '@/components/ui/Toast';
 
-import { Loader2, FileText, FolderOpen, Mail, Calendar, Link, Tag } from 'lucide-react';
+import { Loader2, FileText, FolderOpen, Mail, Calendar, Link, Tag, FolderInput } from 'lucide-react';
 
 const ICON_MAP: Record<string, React.ComponentType<{ className?: string }>> = {
   FileText,
@@ -36,6 +36,8 @@ import {
   useUpdateContactPerson,
   useDeleteContactPerson,
 } from '@/api/hooks';
+import { useContactFolders, useMoveContactToFolder } from '@/api/contacts';
+import type { ContactFolder } from '@/api/contactFolders';
 
 export interface ContactDetailProps {
   contact: UnifiedContact | null;
@@ -178,6 +180,11 @@ export function ContactDetail({ contact, loading, onEdit, onDeleted, dataTestId
   const createPersonMutation = useCreateContactPerson();
   const updatePersonMutation = useUpdateContactPerson();
   const deletePersonMutation = useDeleteContactPerson();
+  const moveContactMut = useMoveContactToFolder();
+  const { data: folderData } = useContactFolders();
+  const folders: ContactFolder[] = folderData ?? [];
+  const [moveFolderOpen, setMoveFolderOpen] = useState(false);
+  const moveFolderRef = useRef<HTMLDivElement>(null);
   const [personModalOpen, setPersonModalOpen] = useState(false);
   const [editingPerson, setEditingPerson] = useState<ContactPerson | null>(null);
   const [activeTab, setActiveTab] = useState('details');
@@ -199,6 +206,35 @@ export function ContactDetail({ contact, loading, onEdit, onDeleted, dataTestId
     }
   }, [aiActiveTab]);
 
+  // Close move folder dropdown on outside click
+  useEffect(() => {
+    if (!moveFolderOpen) return;
+    const handler = (e: MouseEvent) => {
+      if (moveFolderRef.current && !moveFolderRef.current.contains(e.target as Node)) {
+        setMoveFolderOpen(false);
+      }
+    };
+    document.addEventListener('mousedown', handler);
+    return () => document.removeEventListener('mousedown', handler);
+  }, [moveFolderOpen]);
+
+  const handleMoveToFolder = (folderId: string | null) => {
+    if (!contact) return;
+    moveContactMut.mutate(
+      { contactId: contact.id, folderId },
+      {
+        onSuccess: () => {
+          toast.success(folderId ? t('contacts.movedToFolder') : t('contacts.removedFromFolder'));
+          setMoveFolderOpen(false);
+        },
+        onError: (err: unknown) => {
+          const errObj = asError(err);
+          toast.error(errObj.message || t('common.error'));
+        },
+      },
+    );
+  };
+
   // Sync modal from AI UI Control (Phase 4.7)
   useEffect(() => {
     if (aiActiveModal === 'edit' || aiActiveModal === 'create') {
@@ -308,6 +344,42 @@ export function ContactDetail({ contact, loading, onEdit, onDeleted, dataTestId
           </div>
         </div>
         <div className="flex items-center gap-2 flex-shrink-0">
+          {canAccess('contacts:write') && (
+            <div ref={moveFolderRef} className="relative">
+              <Button
+                variant="ghost"
+                size="sm"
+                onClick={() => setMoveFolderOpen(!moveFolderOpen)}
+                icon={<FolderInput className="h-4 w-4" aria-hidden="true" />}
+              >
+                {t('contacts.moveFolder', 'Verschieben')}
+              </Button>
+              {moveFolderOpen && (
+                <div className="absolute right-0 top-full mt-1 bg-white border border-secondary-200 rounded-lg shadow-lg z-20 min-w-[200px] max-h-[300px] overflow-y-auto">
+                  <button
+                    className="w-full text-left px-3 py-2 text-sm hover:bg-secondary-50 border-b border-secondary-100"
+                    onClick={() => handleMoveToFolder(null)}
+                  >
+                    {t('contacts.noFolder', 'Kein Ordner')}
+                  </button>
+                  {folders.map((f) => (
+                    <button
+                      key={f.id}
+                      className="w-full text-left px-3 py-2 text-sm hover:bg-secondary-50 border-b border-secondary-100 last:border-b-0"
+                      style={{ paddingLeft: `${(f.parent_id ? 24 : 12)}px` }}
+                      onClick={() => handleMoveToFolder(f.id)}
+                    >
+                      <FolderOpen className="h-3.5 w-3.5 inline mr-1.5 text-primary-500" />
+                      {f.name}
+                    </button>
+                  ))}
+                  {folders.length === 0 && (
+                    <div className="px-3 py-2 text-xs text-secondary-400">{t('contacts.noFolders', 'Keine Ordner')}</div>
+                  )}
+                </div>
+              )}
+            </div>
+          )}
           {canAccess('contacts:write') && onEdit && (
             <Button variant="ghost" size="sm" onClick={onEdit}>{t('common.edit')}</Button>
           )}

frontend/src/components/layout/Sidebar.tsx

@@ -54,7 +54,6 @@ function getIcon(name: string): React.ReactNode {
 const singleItems: NavSingleItem[] = [
   { to: '/dashboard', labelKey: 'nav.dashboard', icon: <Home className="w-5 h-5 flex-shrink-0" aria-hidden="true" strokeWidth={2} />, order: 0 },
   { to: '/contacts', labelKey: 'nav.contacts', icon: <Users className="w-5 h-5 flex-shrink-0" aria-hidden="true" strokeWidth={2} />, order: 10 },
-  { to: '/wiki', labelKey: 'nav.wiki', icon: <BookOpen className="w-5 h-5 flex-shrink-0" aria-hidden="true" strokeWidth={2} />, order: 30 },
   { to: '/system-dashboard', labelKey: 'nav.systemDashboard', icon: <Activity className="w-5 h-5 flex-shrink-0" aria-hidden="true" strokeWidth={2} />, order: 90 },
 ];
 

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();

frontend/src/components/window/Window.tsx

@@ -154,7 +154,7 @@ export function Window({ window: win }: WindowProps) {
             win.aiChatVisible && 'border-r border-secondary-200'
           )}
         >
-          <ContentComponent {...win.componentProps} />
+          <ContentComponent {...win.componentProps} windowId={win.id} />
         </div>
 
         {/* AI Chat Panel */}

frontend/src/pages/Communication.tsx

@@ -89,6 +89,10 @@ type ConversationCategory = 'system' | 'ai' | 'colleague';
 // ─── Helpers ───
 
 function categorizeConversation(conv: Conversation): ConversationCategory {
+  // Check metadata first (most reliable for AI/system chats)
+  const convType = conv.metadata?.conversation_type;
+  if (convType === 'system') return 'system';
+  if (convType === 'ai') return 'ai';
   // System messages: created by system participant type
   if (conv.participants.some(p => p.participant_type === 'system')) return 'system';
   // AI conversations: have an AI participant
@@ -136,12 +140,13 @@ async function sendMessage(convId: string, content: string, replyToId?: string):
   return r.data;
 }
 
-async function createConversation(title: string | null, participantIds: string[], isDirect: boolean, initialMessage?: string): Promise<Conversation> {
+async function createConversation(title: string | null, participantIds: string[], isDirect: boolean, initialMessage?: string, metadata?: Record<string, unknown>): Promise<Conversation> {
   const r = await apiClient.post('/comm/conversations', {
     title,
     participant_ids: participantIds,
     is_direct: isDirect,
     initial_message: initialMessage,
+    metadata: metadata || {},
   });
   return r.data;
 }
@@ -781,7 +786,11 @@ export function CommunicationPage() {
     try {
       const category = showNewChat;
       const isDirect = category === 'colleague' && participantIds.length === 1;
-      const conv = await createConversation(title || null, participantIds, isDirect);
+      const metadata: Record<string, unknown> =
+        category === 'ai' ? { conversation_type: 'ai' } :
+        category === 'system' ? { conversation_type: 'system' } :
+        {};
+      const conv = await createConversation(title || null, participantIds, isDirect, undefined, metadata);
       setConversations(prev => [...prev, conv]);
       setActiveConvId(conv.id);
       setMobileView('chat');

frontend/src/pages/Wiki.tsx

@@ -80,6 +80,7 @@ export function WikiPage() {
   const [deleteTarget, setDeleteTarget] = useState<WikiArticle | null>(null);
   const [deleting, setDeleting] = useState(false);
   const [restoring, setRestoring] = useState(false);
+  const [browserRefreshKey, setBrowserRefreshKey] = useState(0);
 
   const loadCategories = useCallback(async () => {
     try {
@@ -163,6 +164,7 @@ export function WikiPage() {
         toast.success(t('knowledge.editor.created'));
       }
       setEditorOpen(false);
+      setBrowserRefreshKey((k) => k + 1);
     } catch (err) {
       toast.error(err instanceof Error ? err.message : t('knowledge.editor.saveError'));
     } finally {
@@ -179,6 +181,7 @@ export function WikiPage() {
       setArticle(null);
       setSelectedArticleId(null);
       setDeleteTarget(null);
+      setBrowserRefreshKey((k) => k + 1);
     } catch (err) {
       toast.error(err instanceof Error ? err.message : t('knowledge.editor.deleteError'));
     } finally {
@@ -237,7 +240,7 @@ export function WikiPage() {
       <div className="grid grid-cols-1 lg:grid-cols-4 gap-4 h-[calc(100vh-8rem)]">
         {/* Browser sidebar */}
         <div className="lg:col-span-1 border border-secondary-200 rounded-lg bg-white overflow-hidden">
-          <WikiBrowser selectedArticleId={selectedArticleId} onSelectArticle={handleSelectArticle} />
+          <WikiBrowser selectedArticleId={selectedArticleId} onSelectArticle={handleSelectArticle} refreshKey={browserRefreshKey} />
         </div>
 
         {/* Article detail / editor */}