Fix: In the Agent's workflow, the input content cannot be wrapped, and \n will not work, otherwise an error will be reported #6241 (#6284)

### What problem does this PR solve?

Fix: In the Agent's workflow, the input content cannot be wrapped, and
\n will not work, otherwise an error will be reported #6241

### Type of change

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

web/src/pages/chat/hooks.ts

 
   const handleInputChange: ChangeEventHandler<HTMLTextAreaElement> = (e) => {
     const value = e.target.value;
-    const nextValue = value.replaceAll('\\n', '\n').replaceAll('\\t', '\t');
-    setValue(nextValue);
+    // const nextValue = value.replaceAll('\\n', '\n').replaceAll('\\t', '\t');
+    setValue(value);
   };
 
   return {