fix: pageerror for non-error types

Author: Lightning00Blade

src/McpContext.ts

@@ -103,7 +103,13 @@ export class McpContext implements Context {
           collect(event);
         },
         pageerror: event => {
-          collect(event);
+          if (event instanceof Error) {
+            collect(event);
+          } else {
+            const error = new Error(`${event}`);
+            error.stack = undefined;
+            collect(error);
+          }
         },
       } as ListenerMap;
     });