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/hooks/useAgentChatSession.ts

@@ -269,6 +269,15 @@ export const useAgentChatSession = ({
         sessionId,
         branchGroups,
       };
+      if (
+        isStreaming &&
+        !state.storageSessionId &&
+        !state.sessionId &&
+        state.messages.length > 0
+      ) {
+        return;
+      }
+
       const currentStateKey = createPersistedStateKey(state);
       if (currentStateKey === lastPersistedStateKeyRef.current) {
         return;
@@ -296,7 +305,7 @@ export const useAgentChatSession = ({
     return () => {
       window.clearTimeout(persistTimer);
     };
-  }, [branchGroups, isHydrating, isSessionTitleManuallyEdited, messages, projectId, sessionId, sessionTitle]);
+  }, [branchGroups, isHydrating, isSessionTitleManuallyEdited, isStreaming, messages, projectId, sessionId, sessionTitle]);
 
   useEffect(() => {
     setBranchGroups((prev) => {
@@ -538,42 +547,7 @@ export const useAgentChatSession = ({
     cancelPromiseRef.current = trackedCancelPromise;
   }, []);
 
-  const reset = useCallback(() => {
-    const controller = abortRef.current;
-    controller?.abort();
-    const activeSessionId = sessionIdRef.current;
-    if (activeSessionId) {
-      const cancelPromise = abortAgentChat(activeSessionId).catch((error) => {
-        console.error("[GlobalChatbox] Failed to abort agent session during reset:", error);
-      });
-      const trackedCancelPromise = cancelPromise.finally(() => {
-        if (cancelPromiseRef.current === trackedCancelPromise) {
-          cancelPromiseRef.current = null;
-        }
-      });
-      cancelPromiseRef.current = trackedCancelPromise;
-    }
-    setMessages([]);
-    setSessionTitle(undefined);
-    setIsSessionTitleManuallyEdited(false);
-    setBranchGroups([]);
-    setBranchTransition(null);
-    setSessionId(undefined);
-    sessionIdRef.current = undefined;
-    storageSessionIdRef.current = undefined;
-    lastPersistedStateKeyRef.current = createPersistedStateKey({
-      storageSessionId: undefined,
-      title: undefined,
-      isTitleManuallyEdited: false,
-      messages: [],
-      sessionId: undefined,
-      branchGroups: [],
-    });
-    titleUpdateNonceRef.current += 1;
-    setIsStreaming(false);
-  }, []);
-
-  const createSession = useCallback(async () => {
+  const createSession = useCallback(() => {
     if (isHydrating || isStreaming) return;
 
     const controller = abortRef.current;
@@ -903,7 +877,6 @@ export const useAgentChatSession = ({
     cycleBranch,
     abort,
     createSession,
-    reset,
     renameSession,
     removeSession,
     switchSession,