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>
           )}