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/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: [