Localize agent labels and harden frontend connection status

frontend/src/App.jsx

@@ -217,6 +217,11 @@ export default function LiveTradingApp() {
     };
 
     const handleEventInternal = (evt) => {
+      if (evt?.type && evt.type !== 'pong') {
+        setConnectionStatus('connected');
+        setIsConnected(true);
+      }
+
       // Helper: Update tickers from realtime prices
       const updateTickersFromPrices = (realtimePrices) => {
         try {
@@ -263,10 +268,16 @@ export default function LiveTradingApp() {
         // Connection events
         system: (e) => {
           console.log('[System]', e.content);
-          if (e.content.includes('Connected')) {
+          if (
+            e.content.includes('Connected')
+            || e.content.includes('已连接')
+          ) {
             setConnectionStatus('connected');
             setIsConnected(true);
-          } else if (e.content.includes('Disconnected')) {
+          } else if (
+            e.content.includes('Disconnected')
+            || e.content.includes('断开')
+          ) {
             setConnectionStatus('disconnected');
             setIsConnected(false);
           }
@@ -284,6 +295,8 @@ export default function LiveTradingApp() {
             const state = e.state;
             if (!state) return;
 
+            setConnectionStatus('connected');
+            setIsConnected(true);
             setSystemStatus(state.status || 'initializing');
             setCurrentDate(state.current_date);
 
@@ -385,6 +398,8 @@ export default function LiveTradingApp() {
               return;
             }
 
+            setConnectionStatus('connected');
+            setIsConnected(true);
             console.log(`[Price Update] ${symbol}: $${price} (ret: ${ret !== undefined ? ret.toFixed(2) : 'N/A'}%)`);
 
             // Update ticker price with animation