fix: resolve TS2345 in pageerror handler by using unknown and type guard

scripts/check-broken-assets.ts

@@ -79,10 +79,11 @@ async function main() {
   const consoleErrorsList: Array<{ type: string; error: string; page: string }> = [];
 
   // Listen for unhandled exceptions natively in the page
-  page.on('pageerror', (err: Error) => {
+  page.on('pageerror', (err: unknown) => {
+    const errorMessage = err instanceof Error ? err.message : String(err);
     consoleErrorsList.push({
       type: 'PAGE_ERROR',
-      error: err.message,
+      error: errorMessage,
       page: page.url(),
     });
     hasConsoleErrors = true;