fix: proper drag&drop with dataTransfer, context menu (rename/delete/new), bold active session

frontend/src/components/ai/SessionList.tsx

@@ -1,4 +1,4 @@
-import React, { useEffect, useState } from 'react';
+import React, { useEffect, useState, useRef, useCallback } from 'react';
 import clsx from 'clsx';
 import {
   fetchSessions, createSession, deleteSession, updateSession,
@@ -19,6 +19,13 @@ interface TreeNode {
   children: TreeNode[];
 }
 
+interface ContextMenuState {
+  x: number;
+  y: number;
+  type: 'session' | 'folder' | 'root';
+  id: string | null;
+}
+
 function buildTree(folders: ChatFolder[], sessions: ChatSession[]): TreeNode[] {
   const rootSessions = sessions.filter((s) => !s.folder_id);
   const root: TreeNode = { folder: null, sessions: rootSessions, children: [] };
@@ -36,14 +43,13 @@ function buildTree(folders: ChatFolder[], sessions: ChatSession[]): TreeNode[] {
 }
 
 function TreeItem({
-  node, activeSessionId, onSelectSession, depth, onDeleteFolder, onAddFolder, onDragSession, onDropToFolder,
+  node, activeSessionId, onSelectSession, depth, onContextMenu, onDragSession, onDropToFolder,
 }: {
   node: TreeNode;
   activeSessionId: string | null;
   onSelectSession: (id: string) => void;
   depth: number;
-  onDeleteFolder: (folderId: string) => void;
-  onAddFolder: (parentId: string | null) => void;
+  onContextMenu: (e: React.MouseEvent, type: 'session' | 'folder' | 'root', id: string | null) => void;
   onDragSession: (sessionId: string) => void;
   onDropToFolder: (folderId: string | null) => void;
 }) {
@@ -52,7 +58,6 @@ function TreeItem({
   const isRoot = node.folder === null;
   const folderId = node.folder?.id || null;
 
-  // Drop handler for this specific folder - stopPropagation so parent doesn't also fire
   const handleDrop = (e: React.DragEvent) => {
     e.preventDefault();
     e.stopPropagation();
@@ -63,23 +68,18 @@ function TreeItem({
   const handleDragOver = (e: React.DragEvent) => {
     e.preventDefault();
     e.stopPropagation();
-    setIsDragOver(true);
-  };
-
-  const handleDragLeave = (e: React.DragEvent) => {
-    e.stopPropagation();
-    // Only clear if leaving to a non-child element
-    setIsDragOver(false);
+    if (!isRoot) setIsDragOver(true);
   };
 
   return (
     <div>
-      {/* Folder header - this is the drop target */}
+      {/* Folder header - drop target */}
       {!isRoot && (
         <div
           onDragOver={handleDragOver}
-          onDragLeave={handleDragLeave}
+          onDragLeave={() => setIsDragOver(false)}
           onDrop={handleDrop}
+          onContextMenu={(e) => onContextMenu(e, 'folder', node.folder!.id)}
           className={clsx(
             'group flex items-center gap-1 px-2 py-1.5 text-sm font-medium rounded-md cursor-pointer',
             isDragOver ? 'bg-primary-100 ring-2 ring-primary-400' : 'text-secondary-700 hover:bg-secondary-100'
@@ -94,46 +94,51 @@ function TreeItem({
             <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>
           <span className="flex-1 truncate">{node.folder!.name}</span>
-          <button onClick={(e) => { e.stopPropagation(); onAddFolder(node.folder!.id); }} className="opacity-0 group-hover:opacity-100 text-secondary-400 hover:text-primary-600" title="Unterordner">+</button>
-          <button onClick={(e) => { e.stopPropagation(); onDeleteFolder(node.folder!.id); }} className="opacity-0 group-hover:opacity-100 text-secondary-400 hover:text-red-600" title="Löschen">✕</button>
         </div>
       )}
 
-      {/* Sessions in this folder */}
+      {/* Sessions */}
       {(isRoot || expanded) && (
         <div>
           {node.sessions.map((session) => (
             <div
               key={session.id}
               draggable
-              onDragStart={(e) => { e.stopPropagation(); onDragSession(session.id); }}
+              onDragStart={(e) => {
+                e.dataTransfer.setData('text/plain', session.id);
+                e.dataTransfer.effectAllowed = 'move';
+                onDragSession(session.id);
+              }}
+              onContextMenu={(e) => onContextMenu(e, 'session', session.id)}
               onClick={() => onSelectSession(session.id)}
               className={clsx(
                 'group flex items-center gap-2 px-3 py-1.5 text-sm cursor-pointer rounded-md',
                 'hover:bg-secondary-100',
-                activeSessionId === session.id && 'bg-primary-100 text-primary-700'
+                activeSessionId === session.id && 'bg-primary-50'
               )}
               style={{ paddingLeft: depth * 12 + 24 }}
             >
               <svg className="w-3.5 h-3.5 text-secondary-400 flex-shrink-0" fill="none" viewBox="0 0 24 24" stroke="currentColor">
                 <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 12h8M8 8h8m-8 4h8m-8 4h8" />
               </svg>
-              <span className="flex-1 truncate">{session.title}</span>
-              <button onClick={(e) => { e.stopPropagation(); deleteSession(session.id).then(() => window.location.reload()); }} className="opacity-0 group-hover:opacity-100 text-secondary-400 hover:text-red-600" title="Löschen">✕</button>
+              <span className={clsx('flex-1 truncate', activeSessionId === session.id && 'font-bold text-primary-700')}>
+                {session.title}
+              </span>
             </div>
           ))}
         </div>
       )}
 
-      {/* Root drop zone - only for root level, separate from sessions */}
+      {/* Root drop zone */}
       {isRoot && (
         <div
           onDragOver={handleDragOver}
-          onDragLeave={handleDragLeave}
+          onDragLeave={() => setIsDragOver(false)}
           onDrop={handleDrop}
+          onContextMenu={(e) => onContextMenu(e, 'root', null)}
           className={clsx(
-            'min-h-[8px] rounded-md transition-colors',
-            isDragOver && 'bg-primary-50 ring-1 ring-primary-300'
+            'min-h-[12px] mt-1 rounded-md transition-colors',
+            isDragOver ? 'bg-primary-50 ring-1 ring-primary-300' : 'hover:bg-secondary-50'
           )}
         />
       )}
@@ -146,8 +151,7 @@ function TreeItem({
           activeSessionId={activeSessionId}
           onSelectSession={onSelectSession}
           depth={depth + 1}
-          onDeleteFolder={onDeleteFolder}
-          onAddFolder={onAddFolder}
+          onContextMenu={onContextMenu}
           onDragSession={onDragSession}
           onDropToFolder={onDropToFolder}
         />
@@ -156,12 +160,69 @@ function TreeItem({
   );
 }
 
+function ContextMenu({
+  state, onClose, onRename, onDelete, onNewFolder, onNewChat,
+}: {
+  state: ContextMenuState;
+  onClose: () => void;
+  onRename: (id: string, type: 'session' | 'folder') => void;
+  onDelete: (id: string, type: 'session' | 'folder') => void;
+  onNewFolder: () => void;
+  onNewChat: () => void;
+}) {
+  const ref = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    const handler = (e: MouseEvent) => {
+      if (ref.current && !ref.current.contains(e.target as Node)) onClose();
+    };
+    document.addEventListener('mousedown', handler);
+    return () => document.removeEventListener('mousedown', handler);
+  }, [onClose]);
+
+  const items: { label: string; action: () => void; danger?: boolean }[] = [];
+
+  if (state.type === 'session') {
+    items.push({ label: 'Umbenennen', action: () => { onRename(state.id!, 'session'); onClose(); } });
+    items.push({ label: 'Löschen', action: () => { onDelete(state.id!, 'session'); onClose(); }, danger: true });
+  } else if (state.type === 'folder') {
+    items.push({ label: 'Umbenennen', action: () => { onRename(state.id!, 'folder'); onClose(); } });
+    items.push({ label: 'Neuer Unterordner', action: () => { onClose(); /* TODO */ } });
+    items.push({ label: 'Löschen', action: () => { onDelete(state.id!, 'folder'); onClose(); }, danger: true });
+  } else {
+    items.push({ label: 'Neuer Chat', action: () => { onNewChat(); onClose(); } });
+    items.push({ label: 'Neuer Ordner', action: () => { onNewFolder(); onClose(); } });
+  }
+
+  return (
+    <div
+      ref={ref}
+      className="fixed z-50 bg-white border border-secondary-200 rounded-lg shadow-lg py-1 min-w-[160px]"
+      style={{ left: state.x, top: state.y }}
+    >
+      {items.map((item, i) => (
+        <button
+          key={i}
+          onClick={item.action}
+          className={clsx(
+            'w-full text-left px-3 py-1.5 text-sm hover:bg-secondary-100',
+            item.danger && 'text-red-600 hover:bg-red-50'
+          )}
+        >
+          {item.label}
+        </button>
+      ))}
+    </div>
+  );
+}
+
 export function SessionList({ activeSessionId, onSelectSession, isSidebar, className }: SessionListProps) {
   const [sessions, setSessions] = useState<ChatSession[]>([]);
   const [folders, setFolders] = useState<ChatFolder[]>([]);
   const [loading, setLoading] = useState(true);
   const [error, setError] = useState<string | null>(null);
   const [dragSessionId, setDragSessionId] = useState<string | null>(null);
+  const [contextMenu, setContextMenu] = useState<ContextMenuState | null>(null);
 
   const loadData = async () => {
     try {
@@ -174,15 +235,50 @@ export function SessionList({ activeSessionId, onSelectSession, isSidebar, class
 
   useEffect(() => { loadData(); }, [isSidebar]);
 
-  const handleAddFolder = (parentId: string | null) => {
-    const name = prompt('Ordnername:');
-    if (!name) return;
-    createFolder({ name, parent_id: parentId || undefined }).then(() => loadData()).catch((e) => setError(e?.message));
+  const handleContextMenu = useCallback((e: React.MouseEvent, type: 'session' | 'folder' | 'root', id: string | null) => {
+    e.preventDefault();
+    e.stopPropagation();
+    setContextMenu({ x: e.clientX, y: e.clientY, type, id });
+  }, []);
+
+  const handleRename = async (id: string, type: 'session' | 'folder') => {
+    const newName = prompt('Neuer Name:', type === 'session'
+      ? sessions.find(s => s.id === id)?.title || ''
+      : folders.find(f => f.id === id)?.name || ''
+    );
+    if (!newName) return;
+    try {
+      if (type === 'session') await updateSession(id, { title: newName });
+      else await updateFolder(id, { name: newName });
+      loadData();
+    } catch (e) { setError(e instanceof Error ? e.message : 'Rename failed'); }
   };
 
-  const handleDeleteFolder = (folderId: string) => {
-    if (!confirm('Ordner löschen? Chats bleiben erhalten.')) return;
-    deleteFolder(folderId).then(() => loadData()).catch((e) => setError(e?.message));
+  const handleDelete = async (id: string, type: 'session' | 'folder') => {
+    if (!confirm(type === 'session' ? 'Chat löschen?' : 'Ordner löschen? Chats bleiben erhalten.')) return;
+    try {
+      if (type === 'session') {
+        await deleteSession(id);
+        if (activeSessionId === id) onSelectSession('');
+      } else {
+        await deleteFolder(id);
+      }
+      loadData();
+    } catch (e) { setError(e instanceof Error ? e.message : 'Delete failed'); }
+  };
+
+  const handleNewFolder = () => {
+    const name = prompt('Ordnername:');
+    if (!name) return;
+    createFolder({ name }).then(() => loadData()).catch((e) => setError(e?.message));
+  };
+
+  const handleNewChat = async () => {
+    try {
+      const session = await createSession({ is_sidebar: isSidebar || false });
+      onSelectSession(session.id);
+      loadData();
+    } catch (e) { setError(e instanceof Error ? e.message : 'Failed'); }
   };
 
   const handleDropToFolder = async (folderId: string | null) => {
@@ -201,7 +297,12 @@ export function SessionList({ activeSessionId, onSelectSession, isSidebar, class
   return (
     <div className={clsx('flex flex-col h-full', className)}>
       {error && <div className="p-2 text-xs text-red-600">{error}</div>}
-      <div className="flex-1 overflow-y-auto p-2">
+      <div
+        className="flex-1 overflow-y-auto p-2"
+        onContextMenu={(e) => {
+          if (e.target === e.currentTarget) handleContextMenu(e, 'root', null);
+        }}
+      >
         {tree.map((node) => (
           <TreeItem
             key={node.folder?.id || 'root'}
@@ -209,13 +310,22 @@ export function SessionList({ activeSessionId, onSelectSession, isSidebar, class
             activeSessionId={activeSessionId}
             onSelectSession={onSelectSession}
             depth={0}
-            onDeleteFolder={handleDeleteFolder}
-            onAddFolder={handleAddFolder}
+            onContextMenu={handleContextMenu}
             onDragSession={setDragSessionId}
             onDropToFolder={handleDropToFolder}
           />
         ))}
       </div>
+      {contextMenu && (
+        <ContextMenu
+          state={contextMenu}
+          onClose={() => setContextMenu(null)}
+          onRename={handleRename}
+          onDelete={handleDelete}
+          onNewFolder={handleNewFolder}
+          onNewChat={handleNewChat}
+        />
+      )}
     </div>
   );
 }