Refine Browser naming and managed MCP UX

- Rename Browser Use surfaces to Browser
- Register Browser MCP under the new server name
- Mark CloudCLI-managed MCP servers read-only
- Adjust MCP stdio framing and sidebar footer sizing

src/components/main-content/view/subcomponents/MainContentTitle.tsx

@@ -29,7 +29,7 @@ function getTabTitle(activeTab: AppTab, shouldShowTasksTab: boolean, t: (key: st
   }
 
   if (activeTab === 'browser') {
-    return 'Browser Use';
+    return 'Browser';
   }
 
   return 'Project';