增加会话标题重命名功能，优化历史面板交互

src/components/chat/GlobalChatbox.tsx

@@ -70,6 +70,7 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
     cycleBranch,
     abort,
     createSession,
+    renameSession,
     removeSession,
     switchSession,
   } = useAgentChatSession({
@@ -134,6 +135,21 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
     [removeSession],
   );
 
+  const handleRenameSession = useCallback(
+    (storageSessionId: string, title: string) => {
+      void renameSession(storageSessionId, title);
+    },
+    [renameSession],
+  );
+
+  const handleRenameActiveSession = useCallback(
+    (title: string) => {
+      if (!activeStorageSessionId) return;
+      void renameSession(activeStorageSessionId, title);
+    },
+    [activeStorageSessionId, renameSession],
+  );
+
   const handleMouseDown = useCallback((event: React.MouseEvent) => {
     event.preventDefault();
     setIsResizing(true);
@@ -231,9 +247,12 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
 
         <AgentHeader
           sessionTitle={sessionTitle}
+          canRenameSessionTitle={Boolean(activeStorageSessionId)}
+          isHydrating={isHydrating}
           isStreaming={isStreaming}
           isHistoryOpen={isHistoryOpen}
           onHistoryToggle={handleHistoryToggle}
+          onRenameSessionTitle={handleRenameActiveSession}
           onNewConversation={handleNewConversation}
           onClose={onClose}
         />
@@ -277,6 +296,7 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
                 handleSelectSession(id);
                 setIsHistoryOpen(false);
               }}
+              onRenameSession={handleRenameSession}
               onDeleteSession={handleDeleteSession}
             />
           </Box>