fix: pass resolved page to wait_for response snapshot

The wait_for tool correctly waited on the isolatedContext page but
the snapshot attached to its response fell back to the globally
selected page, causing the wrong page content to be returned.

Author: passtas

src/tools/snapshot.ts

@@ -76,6 +76,6 @@ export const waitFor = defineTool({
       `Element with text "${request.params.text}" found.`,
     );
 
-    response.includeSnapshot();
+    response.includeSnapshot({ page });
   },
 });