Feat: Use shadcn-ui to build GenerateForm. #3221 (#5449)

### What problem does this PR solve?

Feat: Use shadcn-ui to build GenerateForm. #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/form-sheet/next.tsx

@@ -122,7 +122,7 @@ const FormSheet = ({
             <span>{t(`${lowerFirst(operatorName)}Description`)}</span>
           </section>
         </SheetHeader>
-        <section>
+        <section className="pt-4">
           {visible && (
             <FlowFormContext.Provider value={node}>
               <OperatorForm