Add open-instance to trade page and mobile/tablet responsive layouts.

Co-authored-by: Cursor <cursoragent@cursor.com>

manual_trading_hub/static/index.html

@@ -816,6 +816,6 @@
   <script src="/assets/dashboard.js?v=20260612-dash-monitor-count"></script>
   <script src="/assets/ai_review_render.js?v=3"></script>
   <script src="/assets/time_close_ui.js?v=2"></script>
-  <script src="/assets/app.js?v=20260618-risk-countdown"></script>
+  <script src="/assets/app.js?v=20260614-open-instance-responsive"></script>
 </body>
 </html>