Feat: Place the new mcp button at the end of the line. #10427 (#11170)

### What problem does this PR solve?

Feat: Place the new mcp button at the end of the line. #10427

### Type of change


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

web/src/pages/agent/index.tsx

@@ -28,6 +28,7 @@ import {
   History,
   LaptopMinimalCheck,
   Logs,
+  MessageSquareCode,
   ScreenShare,
   Settings,
   Upload,
@@ -218,7 +219,7 @@ export default function Agent() {
             onClick={() => showGobalParamSheet()}
             loading={loading}
           >
-            {t('flow.conversationVariable')}
+            <MessageSquareCode /> {t('flow.conversationVariable')}
           </ButtonLoading>
           <Button variant={'secondary'} onClick={handleButtonRunClick}>
             <CirclePlay />