fix: 修复前端侧边栏弹出异常问题

frontend/src/App.tsx

@@ -316,7 +316,7 @@ function AppContent() {
         sessions={sessions}
         activeSessionId={activeSessionId}
         open={sidebarOpen}
-        onToggle={() => setSidebarOpen((v) => !v)}
+        onClose={() => setSidebarOpen(false)}
         onNewSession={handleNewSession}
         onSelectSession={handleSelectSession}
         onDeleteSession={handleDeleteSession}

frontend/src/components/SessionSidebar/index.tsx

@@ -12,7 +12,7 @@ interface SessionSidebarProps {
   sessions: SessionSummary[];
   activeSessionId: string | null;
   open: boolean;
-  onToggle: () => void;
+  onClose: () => void;
   onNewSession: () => void;
   onSelectSession: (id: string) => void;
   onDeleteSession: (id: string) => void;
@@ -56,7 +56,7 @@ export function SessionSidebar({
   sessions,
   activeSessionId,
   open,
-  onToggle,
+  onClose,
   onNewSession,
   onSelectSession,
   onDeleteSession,
@@ -88,7 +88,7 @@ export function SessionSidebar({
   const handleSelect = (id: string) => {
     onSelectSession(id);
     // 选择后自动收起侧边栏
-    onToggle();
+    onClose();
   };
 
   // 过滤 + 分组
@@ -128,14 +128,14 @@ export function SessionSidebar({
 
   return (
     <>
-      <div className="sidebar-backdrop" onClick={onToggle} />
+      <div className="sidebar-backdrop" onClick={onClose} />
       <div className="sidebar">
         {/* 头部：新建 + 收起 */}
         <div className="sidebar__header">
           <button className="sidebar__new-btn" onClick={onNewSession}>
             ✚ {t("sidebar.new")}
           </button>
-          <button className="sidebar__toggle" onClick={onToggle} title={t("sidebar.collapse")}>
+          <button className="sidebar__toggle" onClick={onClose} title={t("sidebar.collapse")}>
             ✕
           </button>
         </div>