fix: initialize playwright before browser attach

browser_controller.py

@@ -406,6 +406,8 @@ class BrowserController:
     async def execute(self, command: str, params: Dict[str, Any] = None) -> Dict[str, Any]:
         """Dispatch a browser_control command from the node-agent wire protocol."""
         params = params or {}
+        if self.playwright is None:
+            await self.initialize()
         layer = params.get("layer", "high_level")
         page_id = params.get("page_id")