fix: remove type=module from app.js to prevent blank screen

internal/webapp/static/index.html

@@ -236,6 +236,6 @@ Idempotent API retries need transactions. Cache invalidation uses TTL tradeoffs
       </aside>
     </main>
     <script src="/assets/i18n.js?v=2"></script>
-    <script src="/assets/app.js?v=2" type="module"></script>
+    <script src="/assets/app.js?v=2"></script>
   </body>
 </html>