fix: loadTrades before chart init + try-catch for CDN failure

- Reorder init(): loadTrades() runs first, charts second
- Wrap chart init in try-catch so UI survives CDN issues
- Update start.sh to detect changes in embedded .html/.js/.css

web/static/app.js

@@ -610,10 +610,10 @@ window.closeTradeDetail = closeTradeDetail;
 // ---- Init ----
 function init() {
   connectSSE();
-  initPriceChart();
-  initSpreadChart();
-  loadTrades();
+  loadTrades(); // run before charts in case Chart CDN is slow
   setInterval(loadTrades, 10000);
+  try { initPriceChart(); } catch(e) { console.warn('Price chart init failed:', e); }
+  try { initSpreadChart(); } catch(e) { console.warn('Spread chart init failed:', e); }
 }
 
 if (document.readyState === 'loading') {