Fix inactive item filtering and radio button behavior

- Filter out inactive items (ItemIsActive=0) in menu modifier display
- Fix radio button groups to prevent deselection (can only switch)
- Add cart clearing on "order not found" errors
- Simplify API base URL configuration

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

lib/screens/cart_view_screen.dart

@@ -73,12 +73,22 @@ class _CartViewScreenState extends State<CartViewScreen> {
       // Update item count in app state
       appState.updateCartItemCount(cart.itemCount);
     } catch (e) {
+      // If cart not found (deleted or doesn't exist), clear it from app state
+      if (e.toString().contains('not_found') || e.toString().contains('Order not found')) {
+        final appState = context.read<AppState>();
+        appState.clearCart();
+        setState(() {
+          _cart = null;
+          _isLoading = false;
+        });
+      } else {
         setState(() {
           _error = e.toString();
           _isLoading = false;
         });
       }
     }
+  }
 
   Future<void> _removeLineItem(OrderLineItem lineItem) async {
     try {

lib/screens/menu_browse_screen.dart

@@ -78,6 +78,9 @@ class _MenuBrowseScreenState extends State<MenuBrowseScreen> {
     _itemsByParent.clear();
 
     for (final item in _allItems) {
+      // Skip inactive items
+      if (!item.isActive) continue;
+
       if (item.isRootItem) {
         _itemsByCategory.putIfAbsent(item.categoryId, () => []).add(item);
       } else {
@@ -842,15 +845,19 @@ class _ItemCustomizationSheetState extends State<_ItemCustomizationSheet> {
 
       final isCurrentlySelected = _selectedItemIds.contains(item.itemId);
 
-      // For radio buttons (max = 1), deselect siblings
+      // For radio buttons (max = 1), deselect siblings and always select the clicked item
       if (parent.maxNumSelectionReq == 1) {
         final siblings = widget.itemsByParent[parent.itemId] ?? [];
         for (final sibling in siblings) {
           _selectedItemIds.remove(sibling.itemId);
           _deselectDescendants(sibling.itemId);
         }
+        // Always select the clicked item (radio buttons can't be deselected)
+        _selectedItemIds.add(item.itemId);
+        return;
       }
 
+      // For checkboxes, allow toggle on/off
       if (isCurrentlySelected) {
         // Deselect this item and all descendants
         _selectedItemIds.remove(item.itemId);

lib/services/api.dart

@@ -58,9 +58,8 @@ class Api {
   }
 
   static String get baseUrl {
-    const v = String.fromEnvironment("AALISTS_API_BASE_URL");
+    const v = String.fromEnvironment("PAYFRIT_API_BASE_URL");
     if (v.isEmpty) {
-      // Default to production API
       return "https://biz.payfrit.com/api";
     }
     return v;