fix: regenerate scroll bottom (#4348)

Author: urmauur

web/screens/Thread/ThreadCenterPanel/ChatBody/index.tsx

@@ -86,20 +86,23 @@ const ChatBody = memo(
     })
 
     useEffect(() => {
+      isUserManuallyScrollingUp.current = false
       if (parentRef.current) {
         parentRef.current.scrollTo({ top: parentRef.current.scrollHeight })
         virtualizer.scrollToIndex(count - 1)
       }
     }, [count, virtualizer])
 
     useEffect(() => {
+      isUserManuallyScrollingUp.current = false
       if (parentRef.current && isGeneratingResponse) {
         parentRef.current.scrollTo({ top: parentRef.current.scrollHeight })
         virtualizer.scrollToIndex(count - 1)
       }
     }, [count, virtualizer, isGeneratingResponse])
 
     useEffect(() => {
+      isUserManuallyScrollingUp.current = false
       if (parentRef.current && isGeneratingResponse) {
         parentRef.current.scrollTo({ top: parentRef.current.scrollHeight })
         virtualizer.scrollToIndex(count - 1)