Fix: Fixed the issue where the thinking mode on the chat page could not be turned off #9789 (#9794)

### What problem does this PR solve?

Fix: Fixed the issue where the thinking mode on the chat page could not
be turned off #9789

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/next-chats/chat/sessions.tsx

@@ -70,7 +70,12 @@ export function Sessions({
         />
       </section>
       <div className="flex justify-between items-center mb-4 pt-10">
-        <span className="text-base font-bold">Conversations</span>
+        <div className="flex items-center gap-3">
+          <span className="text-base font-bold">Conversations</span>
+          <span className="text-text-secondary text-xs">
+            {conversationList.length}
+          </span>
+        </div>
         <Button variant={'ghost'} onClick={addTemporaryConversation}>
           <Plus></Plus>
         </Button>