diff --git a/.claude/settings.local.json b/.claude/settings.local.json
index ccc962c..cfbac33 100644
--- a/.claude/settings.local.json
+++ b/.claude/settings.local.json
@@ -11,7 +11,8 @@
       "Bash(taskkill:*)",
       "Bash(git add:*)",
       "Bash(git commit:*)",
-      "Bash(xargs ls:*)"
+      "Bash(xargs ls:*)",
+      "Bash(python3 -c \"import sys,json; d=json.load\\(sys.stdin\\); [print\\(e['Route']\\) for e in d.get\\('Endpoints',[]\\)[:20]]\")"
     ]
   }
 }
diff --git a/VideoStudy.App/Program.cs b/VideoStudy.App/Program.cs
index 1a8c140..77afb34 100644
--- a/VideoStudy.App/Program.cs
+++ b/VideoStudy.App/Program.cs
@@ -26,6 +26,7 @@ class Program
         app.MainWindow
             .SetTitle("VideoStudy")
             .SetSize(1280, 800)
+            .SetDevToolsEnabled(true)
             .Center();
 
         app.Run();
diff --git a/VideoStudy.App/wwwroot/index.html b/VideoStudy.App/wwwroot/index.html
index a99879a..17364cc 100644
--- a/VideoStudy.App/wwwroot/index.html
+++ b/VideoStudy.App/wwwroot/index.html
@@ -24,7 +24,18 @@
     </div>
 
     <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"></script>
-    <script src="_framework/blazor.modules.js" type="module"></script>
+    <script>
+        window.onerror = function(msg, url, line, col, error) {
+            document.getElementById('app').innerHTML =
+                '<div style="color:red;padding:2rem;font-family:monospace;">' +
+                '<b>Erro JS:</b><br>' + msg + '<br>' + url + ':' + line + '</div>';
+        };
+        window.addEventListener('unhandledrejection', function(e) {
+            document.getElementById('app').innerHTML =
+                '<div style="color:red;padding:2rem;font-family:monospace;">' +
+                '<b>Promise rejeitada:</b><br>' + (e.reason?.message || e.reason) + '</div>';
+        });
+    </script>
     <script src="_framework/blazor.photino.js"></script>
 </body>
 </html>