Browser session recovery, price tracking, and dashboard improvements

- Add browser session validation and auto-restart for BestBuy/GameStop scrapers
- Add price change detection and notifications
- Remove PokemonCenter scraper (now uses Chrome Extension)
- Dashboard UI improvements

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

dashboard/static/app.js

@@ -771,6 +771,9 @@ async function loadControlPanel() {
   // Render scrapers grid
   renderScrapersGrid(state.scrapers);
 
+  // Load Chrome Extension status
+  loadExtensionStatus();
+
   // Setup event listeners for control panel buttons
   setupControlPanelListeners();
 
@@ -783,10 +786,36 @@ async function loadControlPanel() {
         updateMonitorStatus(newState);
         renderScrapersGrid(newState.scrapers);
       }
+      loadExtensionStatus();
     }
   }, 5000);
 }
 
+async function loadExtensionStatus() {
+  const badge = document.getElementById('extensionBadge');
+  const productCount = document.getElementById('extProductCount');
+  const skuCount = document.getElementById('extSkuCount');
+  const lastSync = document.getElementById('extLastSync');
+
+  const stats = await api('/extension/stats');
+
+  if (stats && stats.last_sync) {
+    // Extension has synced data
+    badge.textContent = 'Connected';
+    badge.className = 'extension-badge connected';
+    productCount.textContent = stats.total_products || 0;
+    skuCount.textContent = stats.total_skus || 0;
+    lastSync.textContent = formatTime(new Date(stats.last_sync));
+  } else {
+    // No sync yet
+    badge.textContent = 'No Data';
+    badge.className = 'extension-badge disconnected';
+    productCount.textContent = '-';
+    skuCount.textContent = '-';
+    lastSync.textContent = 'Never';
+  }
+}
+
 function updateMonitorStatus(state) {
   const badge = document.getElementById('monitorBadge');
   const statusText = document.getElementById('monitorStatusText');