feat: P3b 会话重命名 (PATCH + 双击编辑)

backend/src/modules/sandbox/sandbox.controller.ts

@@ -46,4 +46,9 @@ export class SandboxController {
   async share(@Req() req: any, @Param('id', ParseIntPipe) id: number) {
     return this.sandboxService.generateShareToken(req.user.userId, id);
   }
+
+  @Patch('sessions/:id/rename')
+  async rename(@Req() req: any, @Param('id', ParseIntPipe) id: number, @Body() body: { title: string }) {
+    return this.sandboxService.renameSession(req.user.userId, id, body.title);
+  }
 }

backend/src/modules/sandbox/sandbox.service.ts

@@ -126,6 +126,15 @@ export class SandboxService {
     return { success: true };
   }
 
+  async renameSession(userId: number, id: number, title: string) {
+    const session = await this.prisma.sandboxSession.findFirst({
+      where: { id, userId },
+    });
+    if (!session) throw new HttpException('会话不存在', HttpStatus.NOT_FOUND);
+    await this.prisma.sandboxSession.update({ where: { id }, data: { title } });
+    return { success: true };
+  }
+
   async getHistory(userId: number, params: { page?: number; pageSize?: number }) {
     const page = Number(params.page ?? 1);
     const pageSize = Number(params.pageSize ?? 20);

frontend/src/app/sandbox/page.tsx

@@ -73,6 +73,8 @@ function SandboxPage() {
   const [conversationId, setConversationId] = useState(() => crypto.randomUUID());
   const [sessionFeedback, setSessionFeedback] = useState<Record<number, string | null>>({});
   const [currentSessionId, setCurrentSessionId] = useState<number | null>(null);
+  const [renamingId, setRenamingId] = useState<number | null>(null);
+  const [renameValue, setRenameValue] = useState('');
   const messagesEndRef = useRef<HTMLDivElement>(null);
   const messagesContainerRef = useRef<HTMLDivElement>(null);
   const { isLoggedIn } = useAuth();
@@ -212,6 +214,20 @@ function SandboxPage() {
     } catch {}
   }
 
+  async function renameSession(sessionId: number, title: string) {
+    const tk = getToken();
+    if (!tk || !title.trim()) return;
+    try {
+      await fetch(`${API_BASE}/sandbox/sessions/${sessionId}/rename`, {
+        method: 'PATCH',
+        headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${tk}` },
+        body: JSON.stringify({ title: title.trim() }),
+      });
+      setSessions(prev => prev.map(s => s.id === sessionId ? { ...s, title: title.trim() } : s));
+      setRenamingId(null);
+    } catch {}
+  }
+
   function newChat() {
     setConversationId(crypto.randomUUID());
     setCurrentSessionId(null);
@@ -322,9 +338,18 @@ function SandboxPage() {
                   {sessions.length === 0 ? (
                     <div className="p-4 text-center text-xs text-muted-foreground">{t.sandbox.noHistory}</div>
                   ) : sessions.map(s => (
-                    <div key={s.id} onClick={() => { loadSession(s.id); setSessionsOpen(false); }}
+                      <div key={s.id} onClick={() => { if (renamingId !== s.id) { loadSession(s.id); setSessionsOpen(false); } }}
-                      className="group px-3 py-2.5 hover:bg-accent cursor-pointer border-b border-border/50">
+                        className="group px-3 py-2.5 hover:bg-accent cursor-pointer border-b border-border/50"
+                        onDoubleClick={() => { setRenamingId(s.id); setRenameValue(s.title); }}>
+                        {renamingId === s.id ? (
+                          <input type="text" value={renameValue} onChange={e => setRenameValue(e.target.value)}
+                            autoFocus onClick={e => e.stopPropagation()}
+                            onBlur={() => renameSession(s.id, renameValue)}
+                            onKeyDown={e => { if (e.key === 'Enter') { e.stopPropagation(); renameSession(s.id, renameValue); } if (e.key === 'Escape') setRenamingId(null); }}
+                            className="w-full px-1 py-0.5 text-xs font-medium bg-background border border-border rounded focus:outline-none" />
+                        ) : (
                           <div className="text-xs font-medium text-foreground truncate">{s.title}</div>
+                        )}
                       <div className="flex items-center justify-between mt-1">
                         <span className="text-[10px] text-muted-foreground">{formatTime(s.updatedAt)} · {s.model}</span>
                         <button onClick={e => { e.stopPropagation(); deleteSession(s.id); }}