fix: imporve the condition for stopping the think timer. (#25365)

web/app/components/base/markdown-blocks/think-block.tsx

 import React, { useEffect, useRef, useState } from 'react'
 import { useTranslation } from 'react-i18next'
+import { useChatContext } from '../chat/chat/context'
 
 const hasEndThink = (children: any): boolean => {
   if (typeof children === 'string')
 }
 
 const useThinkTimer = (children: any) => {
+  const { isResponding } = useChatContext()
   const [startTime] = useState(Date.now())
   const [elapsedTime, setElapsedTime] = useState(0)
   const [isComplete, setIsComplete] = useState(false)
   }, [startTime, isComplete])
 
   useEffect(() => {
-    if (hasEndThink(children))
+    if (hasEndThink(children) || !isResponding)
       setIsComplete(true)
-  }, [children])
+  }, [children, isResponding])
 
   return { elapsedTime, isComplete }
 }