Pass business ID to HUD when opening from portal

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

portal/index.html

@@ -196,7 +196,7 @@
                     </svg>
                     Open KDS
                   </button>
-                  <button class="action-btn" onclick="window.open('/hud/index.html', '_blank')">
+                  <button class="action-btn" onclick="Portal.openHUD()">
                     <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2">
                       <path d="M18 20V10M12 20V4M6 20v-6"/>
                     </svg>

portal/portal.js

@@ -167,6 +167,11 @@ const Portal = {
     this.navigate(hash);
   },
 
+  // Open HUD in new window with business ID
+  openHUD() {
+    window.open('/hud/index.html?b=' + this.config.businessId, '_blank');
+  },
+
   // Navigate to page
   navigate(page) {
     console.log('[Portal] Navigating to:', page);