feat: upgrade @mcp-ui/client package and improve UI message handling (#4164)

ui/desktop/src/main.ts

@@ -1070,6 +1070,17 @@ ipcMain.on('react-ready', () => {
   console.log('[main] React ready - window is prepared for deep links');
 });
 
+// Handle external URL opening
+ipcMain.handle('open-external', async (_event, url: string) => {
+  try {
+    await shell.openExternal(url);
+    return true;
+  } catch (error) {
+    console.error('Error opening external URL:', error);
+    throw error;
+  }
+});
+
 // Handle directory chooser
 ipcMain.handle('directory-chooser', (_event) => {
   return openDirectoryDialog();