fix(hub): render AI coach summary and chat as Markdown

Reuse shared ai_review_render.js so summaries and coach replies display formatted lists and bold text instead of raw syntax.

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

manual_trading_hub/static/index.html

@@ -287,6 +287,7 @@
   <div id="toast"></div>
   <script src="https://unpkg.com/lightweight-charts@4.2.0/dist/lightweight-charts.standalone.production.js"></script>
   <script src="/assets/chart.js?v=20260604-upnl-contracts"></script>
-  <script src="/assets/app.js?v=20260606-hub-ai3"></script>
+  <script src="/assets/ai_review_render.js?v=2"></script>
+  <script src="/assets/app.js?v=20260606-hub-ai-md"></script>
 </body>
 </html>