fix(chat): preserve agent UI across close

src/components/chat/GlobalChatbox.tsx

@@ -42,7 +42,7 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
   const isNearBottomRef = useRef(true);
   const streamingScrollFrameRef = useRef<number | null>(null);
   const composerRef = useRef<AgentComposerHandle | null>(null);
-  const hasResetForOpenRef = useRef(false);
+  const initializedProjectIdRef = useRef<string | null | undefined>(undefined);
   const theme = useTheme();
   const { open: openNotification } = useNotification();
   const currentProjectId = useProjectStore((state) => state.currentProjectId);
@@ -154,6 +154,17 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
     isNearBottomRef.current = isNearBottom;
   }, []);
 
+  const resetConversationView = useCallback(() => {
+    composerRef.current?.clear();
+    setIsHistoryOpen(false);
+    window.setTimeout(() => {
+      composerRef.current?.focus();
+      isNearBottomRef.current = true;
+      cancelStreamingScroll();
+      scrollToBottom("auto");
+    }, 0);
+  }, [cancelStreamingScroll, scrollToBottom]);
+
   useEffect(() => {
     if (isStreaming) {
       if (!isNearBottomRef.current) return;
@@ -178,24 +189,18 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
   );
 
   useEffect(() => {
-    if (!open) {
-      hasResetForOpenRef.current = false;
+    if (
+      !open ||
+      isHydrating ||
+      initializedProjectIdRef.current === currentProjectId
+    ) {
       return;
     }
-    if (hasResetForOpenRef.current || isHydrating) return;
-    hasResetForOpenRef.current = true;
 
-    const timer = window.setTimeout(() => {
-      createSession();
-      composerRef.current?.clear();
-      setIsHistoryOpen(false);
-      composerRef.current?.focus();
-      isNearBottomRef.current = true;
-      cancelStreamingScroll();
-      scrollToBottom("auto");
-    }, 0);
-    return () => window.clearTimeout(timer);
-  }, [cancelStreamingScroll, createSession, isHydrating, open, scrollToBottom]);
+    initializedProjectIdRef.current = currentProjectId;
+    createSession();
+    resetConversationView();
+  }, [createSession, currentProjectId, isHydrating, open, resetConversationView]);
 
   const handleSend = useCallback(async (prompt: string) => {
     if (isStreaming || isCheckingAuth) return;
@@ -230,14 +235,8 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
     handleStopSpeech();
     stopListening();
     createSession();
-    composerRef.current?.clear();
-    window.setTimeout(() => {
-      composerRef.current?.focus();
-      isNearBottomRef.current = true;
-      cancelStreamingScroll();
-      scrollToBottom("auto");
-    }, 0);
-  }, [cancelStreamingScroll, createSession, handleStopSpeech, scrollToBottom, stopListening]);
+    resetConversationView();
+  }, [createSession, handleStopSpeech, resetConversationView, stopListening]);
 
   const handleHistoryToggle = useCallback(() => {
     setIsHistoryOpen((prev) => !prev);
@@ -311,6 +310,7 @@ export const GlobalChatbox: React.FC<Props> = ({ open, onClose }) => {
       hideBackdrop
       disableScrollLock
       disableEnforceFocus
+      ModalProps={{ keepMounted: true }}
       sx={{
         zIndex: (muiTheme) => muiTheme.zIndex.modal + 100,
         pointerEvents: "none",