Feat: Adjust the style of the agent canvas connection line #3221 (#8922)

### What problem does this PR solve?

Feat: Adjust the style of the agent canvas connection line #3221

### Type of change


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

web/src/pages/agent/canvas/node/node-wrapper.tsx

@@ -1,14 +1,14 @@
 import { cn } from '@/lib/utils';
-import { HTMLAttributes, PropsWithChildren } from 'react';
+import { HTMLAttributes } from 'react';
 
-export function NodeWrapper({
-  children,
-  className,
-}: PropsWithChildren & HTMLAttributes<HTMLDivElement>) {
+type IProps = HTMLAttributes<HTMLDivElement> & { selected?: boolean };
+
+export function NodeWrapper({ children, className, selected }: IProps) {
   return (
     <section
       className={cn(
         'bg-background-header-bar p-2.5 rounded-md w-[200px] text-xs',
+        { 'border border-background-checked': selected },
         className,
       )}
     >