feat: remove header and buttons, move actions to toolbar, drag&drop to any folder level

frontend/src/components/ai/SessionList.tsx

@@ -36,13 +36,12 @@ function buildTree(folders: ChatFolder[], sessions: ChatSession[]): TreeNode[] {
 }
 
 function TreeItem({
-  node, activeSessionId, onSelectSession, depth, onMoveSession, onDeleteFolder, onAddFolder, onDragSession, onDropToFolder,
+  node, activeSessionId, onSelectSession, depth, onDeleteFolder, onAddFolder, onDragSession, onDropToFolder,
 }: {
   node: TreeNode;
   activeSessionId: string | null;
   onSelectSession: (id: string) => void;
   depth: number;
-  onMoveSession: (sessionId: string, folderId: string | null) => void;
   onDeleteFolder: (folderId: string) => void;
   onAddFolder: (parentId: string | null) => void;
   onDragSession: (sessionId: string) => void;
@@ -109,7 +108,6 @@ function TreeItem({
           activeSessionId={activeSessionId}
           onSelectSession={onSelectSession}
           depth={depth + 1}
-          onMoveSession={onMoveSession}
           onDeleteFolder={onDeleteFolder}
           onAddFolder={onAddFolder}
           onDragSession={onDragSession}
@@ -138,15 +136,8 @@ export function SessionList({ activeSessionId, onSelectSession, isSidebar, class
 
   useEffect(() => { loadData(); }, [isSidebar]);
 
-  const handleNewChat = async () => {
-    try {
-      const session = await createSession({ is_sidebar: isSidebar || false });
-      setSessions((prev) => [session, ...prev]); onSelectSession(session.id);
-    } catch (e) { setError(e instanceof Error ? e.message : 'Failed'); }
-  };
-
   const handleAddFolder = (parentId: string | null) => {
-    const name = prompt('Ordnername:');;
+    const name = prompt('Ordnername:');
     if (!name) return;
     createFolder({ name, parent_id: parentId || undefined }).then(() => loadData()).catch((e) => setError(e?.message));
   };
@@ -171,10 +162,6 @@ export function SessionList({ activeSessionId, onSelectSession, isSidebar, class
 
   return (
     <div className={clsx('flex flex-col h-full', className)}>
-      <div className="p-3 border-b border-secondary-200 flex gap-2">
-        <button onClick={handleNewChat} className="flex-1 rounded-lg bg-primary-600 text-white px-3 py-2 text-sm font-medium hover:bg-primary-700">+ Neuer Chat</button>
-        <button onClick={() => handleAddFolder(null)} className="rounded-lg border border-secondary-300 px-3 py-2 text-sm hover:bg-secondary-100" title="Neuer Ordner">📁+</button>
-      </div>
       {error && <div className="p-2 text-xs text-red-600">{error}</div>}
       <div className="flex-1 overflow-y-auto p-2">
         {tree.map((node) => (
@@ -184,7 +171,6 @@ export function SessionList({ activeSessionId, onSelectSession, isSidebar, class
             activeSessionId={activeSessionId}
             onSelectSession={onSelectSession}
             depth={0}
-            onMoveSession={() => {}}
             onDeleteFolder={handleDeleteFolder}
             onAddFolder={handleAddFolder}
             onDragSession={setDragSessionId}

frontend/src/pages/AIAssistant.tsx

@@ -9,6 +9,7 @@ export function AIAssistantPage() {
   const [agents, setAgents] = useState<AIAgent[]>([]);
   const [selectedAgentId, setSelectedAgentId] = useState<string | null>(null);
   const [mobileView, setMobileView] = useState<'list' | 'chat'>('list');
+  const [refreshKey, setRefreshKey] = useState(0);
   const { registerItems, unregisterPlugin } = usePluginToolbarStore();
 
   useEffect(() => { fetchAgents().then(setAgents).catch(() => {}); }, []);
@@ -37,7 +38,27 @@ export function AIAssistantPage() {
             <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4v16m8-8H4" />
           </svg>
         ),
-        onClick: () => { setActiveSessionId(null); setMobileView('list'); },
+        onClick: () => { setActiveSessionId(null); setMobileView('list'); setRefreshKey(k => k + 1); },
+      },
+      {
+        id: 'new-folder',
+        plugin: 'ai_assistant',
+        label: 'Ordner',
+        type: 'button',
+        group: 'actions',
+        icon: (
+          <svg className="w-3.5 h-3.5" fill="none" viewBox="0 0 24 24" stroke="currentColor">
+            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 7v10a2 2 0 002 2h14a2 2 0 002-2V9a2 2 0 00-2-2h-6l-2-2H5a2 2 0 00-2 2z" />
+          </svg>
+        ),
+        onClick: () => {
+          const name = prompt('Ordnername:');
+          if (name) {
+            import('@/api/ai').then(({ createFolder }) => {
+              createFolder({ name }).then(() => setRefreshKey(k => k + 1)).catch(() => {});
+            });
+          }
+        },
       },
     ]);
     return () => unregisterPlugin('ai_assistant');
@@ -49,8 +70,7 @@ export function AIAssistantPage() {
     <div className="flex h-full" data-testid="ai-assistant-page">
       {/* Desktop: two-pane layout */}
       <div className="hidden md:flex w-72 flex-shrink-0 border-r border-secondary-200 bg-white flex-col">
-        <div className="h-16 flex items-center px-6 border-b border-secondary-200"><h1 className="text-lg font-bold text-secondary-900">KI Assistent</h1></div>
-        <SessionList activeSessionId={activeSessionId} onSelectSession={setActiveSessionId} className="h-[calc(100%-4rem)]" />
+        <SessionList key={refreshKey} activeSessionId={activeSessionId} onSelectSession={setActiveSessionId} className="flex-1" />
       </div>
       <div className="hidden md:flex flex-1 flex-col">
         {activeSessionId ? <ChatWindow sessionId={activeSessionId} agentId={selectedAgentId} className="flex-1" /> : (
@@ -61,8 +81,7 @@ export function AIAssistantPage() {
       <div className="flex md:hidden flex-1 flex-col overflow-hidden">
         {mobileView === 'list' && (
           <div className="flex-1 flex flex-col bg-white">
-            <div className="h-14 flex items-center px-4 border-b border-secondary-200"><h1 className="text-lg font-bold text-secondary-900">KI Assistent</h1></div>
-            <SessionList activeSessionId={activeSessionId} onSelectSession={handleSelectSession} className="flex-1" />
+            <SessionList key={refreshKey} activeSessionId={activeSessionId} onSelectSession={handleSelectSession} className="flex-1" />
           </div>
         )}
         {mobileView === 'chat' && activeSessionId && (