修复会话记录可能存储两次的bug；更改会话行为，默认进入新对话

src/components/chat/GlobalChatbox.tsx

@@ -32,6 +32,7 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
 
   const bottomRef = useRef<HTMLDivElement>(null);
   const inputRef = useRef<HTMLInputElement | null>(null);
+  const hasResetForOpenRef = useRef(false);
   const theme = useTheme();
   const currentProjectId = useProjectStore((state) => state.currentProjectId);
 
@@ -87,13 +88,22 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
   }, [messages, isStreaming]);
 
   useEffect(() => {
-    if (!open) return;
+    if (!open) {
+      hasResetForOpenRef.current = false;
+      return;
+    }
+    if (hasResetForOpenRef.current || isHydrating) return;
+    hasResetForOpenRef.current = true;
+
     const timer = window.setTimeout(() => {
+      createSession();
+      setInput("");
+      setIsHistoryOpen(false);
       inputRef.current?.focus();
       bottomRef.current?.scrollIntoView({ behavior: "auto" });
     }, 0);
     return () => window.clearTimeout(timer);
-  }, [open]);
+  }, [createSession, isHydrating, open]);
 
   const handleSend = useCallback(() => {
     const prompt = input.trim();
@@ -112,7 +122,7 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
   const handleNewConversation = useCallback(() => {
     handleStopSpeech();
     stopListening();
-    void createSession();
+    createSession();
     setInput("");
     window.setTimeout(() => {
       inputRef.current?.focus();