feat: Add functionality to move inventory items to pantry and enhance pantry management

- Implemented moveInventoryItemToPantry method in InventoryRepository to facilitate moving items from inventory to pantry.
- Enhanced InventoryScreen with a new header section providing context about the inventory.
- Added a button in SwipeableInventoryTile to move items to pantry with appropriate error handling.
- Introduced movePantryItemToInventory method in PantryRepository to support moving items back to inventory.
- Refactored PantryScreen to rename _addToInventory to _moveToInventory for clarity and updated UI to reflect changes.
- Added AdminPantryItem model to represent pantry items in the admin panel.
- Created AdminPantryPanel for managing pantry items, including moving items to inventory and listing users.
- Developed AdminPrivateProductsPanel for managing private products, allowing promotion to global products.

flutter/lib/features/pantry/presentation/pantry_screen.dart

@@ -40,7 +40,7 @@ class _PantryScreenState extends ConsumerState<PantryScreen> {
     _logger.info('Initializing PantryScreen');
   }
 
-  Future<void> _addToInventory(PantryItem item) async {
+  Future<void> _moveToInventory(PantryItem item) async {
     final quantityController = TextEditingController(text: '1');
     String selectedUnit = 'st';
     String? selectedLocation;
@@ -155,8 +155,9 @@ class _PantryScreenState extends ConsumerState<PantryScreen> {
 
     try {
       final token = await ref.read(authStateProvider.future);
-      await ref.read(inventoryRepositoryProvider).createInventoryItem(
-        {
+      await ref.read(pantryRepositoryProvider).movePantryItemToInventory(
+        item.id,
+        body: {
           'productId': item.productId,
           'quantity': payload['quantity'] as double,
           'unit': payload['unit'] as String,
@@ -164,10 +165,11 @@ class _PantryScreenState extends ConsumerState<PantryScreen> {
         },
         token: token,
       );
+      ref.invalidate(pantryProvider);
       ref.invalidate(inventoryProvider);
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(context.l10n.pantryItemAdded(item.displayName))),
+        SnackBar(content: Text('Flyttade "${item.displayName}" till inventarie.')),
       );
     } catch (error) {
       _logger.severe('Failed to add item to inventory: $error');
@@ -235,12 +237,14 @@ class _PantryScreenState extends ConsumerState<PantryScreen> {
     if (pantryAsync.hasError || productsAsync.hasError) {
       final error = pantryAsync.error ?? productsAsync.error;
       _logger.severe('Error loading pantry or products: $error');
-      return ErrorStateView(
+      return buildCopyableErrorPanel(
+        context: context,
         message: mapErrorToUserMessage(error ?? 'Okänt fel', context),
         onRetry: () {
           ref.invalidate(pantryProvider);
           ref.invalidate(pantryProductsProvider);
         },
+        title: 'Kunde inte läsa baslagret',
       );
     }
 
@@ -323,11 +327,42 @@ class _PantryScreenState extends ConsumerState<PantryScreen> {
       ),
     );
 
+    final headerSection = Padding(
+      padding: const EdgeInsets.fromLTRB(12, 12, 12, 4),
+      child: Card(
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.start,
+            children: [
+              Text('Baslager', style: Theme.of(context).textTheme.titleMedium),
+              const SizedBox(height: 8),
+              Text(
+                'Det här är ditt user-scope baslager. Här lagrar du sådant du vill ha lätt åtkomligt och kan flytta poster vidare till inventarie när det behövs.',
+                style: Theme.of(context).textTheme.bodyMedium,
+              ),
+              const SizedBox(height: 8),
+              const Wrap(
+                spacing: 8,
+                runSpacing: 8,
+                children: [
+                  Chip(label: Text('User-scope')),
+                  Chip(label: Text('Flytta till inventarie')),
+                  Chip(label: Text('Plats + kategori')),
+                ],
+              ),
+            ],
+          ),
+        ),
+      ),
+    );
+
     final content = filteredItems.isEmpty
         ? ListView(
             key: const PageStorageKey<String>('pantry-empty-list'),
             padding: const EdgeInsets.fromLTRB(12, 0, 12, 96),
             children: [
+              headerSection,
               filterSection,
               const EmptyStateView(
                 title: 'Baslagret är tomt',
@@ -338,11 +373,12 @@ class _PantryScreenState extends ConsumerState<PantryScreen> {
         : ListView.separated(
           key: const PageStorageKey<String>('pantry-main-list'),
             padding: const EdgeInsets.fromLTRB(12, 0, 12, 96),
-            itemCount: filteredItems.length + 1,
+            itemCount: filteredItems.length + 2,
             separatorBuilder: (_, __) => const Divider(height: 1),
             itemBuilder: (context, index) {
               if (index == 0) return filterSection;
-              final item = filteredItems[index - 1];
+              if (index == 1) return headerSection;
+              final item = filteredItems[index - 2];
               final l1Category = _resolveL1Category(item, productById);
 
               return ListTile(
@@ -358,9 +394,9 @@ class _PantryScreenState extends ConsumerState<PantryScreen> {
                   mainAxisSize: MainAxisSize.min,
                   children: [
                     IconButton(
-                      tooltip: 'Lägg i inventarie',
+                      tooltip: 'Flytta till inventarie',
                       icon: const Icon(Icons.inventory_2_outlined),
-                      onPressed: () => _addToInventory(item),
+                      onPressed: () => _moveToInventory(item),
                     ),
                     IconButton(
                       tooltip: 'Ta bort',