feat: implement alias strategy for receipt import with user-scoped and global fallback, enhance validation and normalization, and update UI components

flutter/lib/features/admin/data/admin_repository.dart

@@ -173,6 +173,9 @@ class AdminRepository {
   Future<List<AdminProduct>> listProducts() =>
       _getList(ProductApiPaths.mine, AdminProduct.fromJson);
 
+    Future<List<AdminProduct>> listGlobalProducts() =>
+      _getList(ProductApiPaths.list, AdminProduct.fromJson, requiresAuth: false);
+
   Future<List<AdminProduct>> listDeletedProducts() =>
       _getList(ProductApiPaths.deleted, AdminProduct.fromJson);
 

flutter/lib/features/admin/domain/receipt_alias.dart

@@ -2,6 +2,8 @@ class ReceiptAlias {
   final int id;
   final String receiptName;
   final int productId;
+  final int? ownerId;
+  final bool isGlobal;
   final String? productName;
   final String? productCanonicalName;
 
@@ -9,10 +11,14 @@ class ReceiptAlias {
     required this.id,
     required this.receiptName,
     required this.productId,
+    required this.ownerId,
+    required this.isGlobal,
     this.productName,
     this.productCanonicalName,
   });
 
+  bool get isPrivate => !isGlobal;
+
   String get displayProductName {
     final canonical = productCanonicalName?.trim();
     if (canonical != null && canonical.isNotEmpty) return canonical;
@@ -33,6 +39,8 @@ class ReceiptAlias {
       productId: (json['productId'] as num?)?.toInt() ??
           (productMap['id'] as num?)?.toInt() ??
           0,
+      ownerId: (json['ownerId'] as num?)?.toInt(),
+      isGlobal: json['isGlobal'] == true,
       productName: productMap['name']?.toString(),
       productCanonicalName: productMap['canonicalName']?.toString(),
     );

flutter/lib/features/admin/presentation/admin_aliases_panel.dart

@@ -46,7 +46,7 @@ class _AdminAliasesPanelState extends ConsumerState<AdminAliasesPanel> {
     try {
       final results = await Future.wait<dynamic>([
         ref.read(adminRepositoryProvider).listReceiptAliases(),
-        ref.read(adminRepositoryProvider).listProducts(),
+        ref.read(adminRepositoryProvider).listGlobalProducts(),
       ]);
       if (!mounted) return;
       setState(() {
@@ -67,7 +67,7 @@ class _AdminAliasesPanelState extends ConsumerState<AdminAliasesPanel> {
   }
 
   Future<void> _upsertAlias() async {
-    final rawAlias = _aliasController.text.trim().toLowerCase();
+    final rawAlias = _aliasController.text.trim();
     final productId = _selectedProductId;
     if (rawAlias.isEmpty || productId == null) {
       ScaffoldMessenger.of(context).showSnackBar(
@@ -186,6 +186,11 @@ class _AdminAliasesPanelState extends ConsumerState<AdminAliasesPanel> {
                   color: Theme.of(context).colorScheme.outline,
                 ),
               ),
+              const SizedBox(height: 4),
+              Chip(
+                visualDensity: VisualDensity.compact,
+                label: Text(alias.isGlobal ? 'Global' : 'Privat'),
+              ),
             ],
           ),
           trailing: IconButton(
@@ -198,17 +203,6 @@ class _AdminAliasesPanelState extends ConsumerState<AdminAliasesPanel> {
       );
     }
 
-    Widget buildAliasList({EdgeInsetsGeometry padding = EdgeInsets.zero}) {
-      return ListView.builder(
-        padding: padding,
-        itemCount: filteredAliases.length,
-        itemBuilder: (context, index) {
-          final alias = filteredAliases[index];
-          return buildAliasCard(alias);
-        },
-      );
-    }
-
     final content = Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [