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/admin/presentation/admin_users_panel.dart

@@ -254,10 +254,7 @@ class _AdminUsersPanelState extends ConsumerState<AdminUsersPanel> {
 
   void _showError(Object e) {
     ScaffoldMessenger.of(context).showSnackBar(
-      SnackBar(
-        content: Text(mapErrorToUserMessage(e, context)),
-        backgroundColor: Theme.of(context).colorScheme.error,
-      ),
+      buildCopyableErrorSnackBar(context, mapErrorToUserMessage(e, context)),
     );
   }
 
@@ -299,15 +296,11 @@ class _AdminUsersPanelState extends ConsumerState<AdminUsersPanel> {
       return const Center(child: CircularProgressIndicator());
     }
     if (_error != null) {
-      return Center(
-        child: Column(
-          mainAxisSize: MainAxisSize.min,
-          children: [
-            Text(_error!, style: TextStyle(color: theme.colorScheme.error)),
-            const SizedBox(height: 16),
-            FilledButton(onPressed: _load, child: Text(context.l10n.retryAction)),
-          ],
-        ),
+      return buildCopyableErrorPanel(
+        context: context,
+        message: _error!,
+        onRetry: _load,
+        title: 'Kunde inte läsa användare',
       );
     }
     if (_users.isEmpty) {
@@ -315,14 +308,36 @@ class _AdminUsersPanelState extends ConsumerState<AdminUsersPanel> {
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
           if (widget.embedded) ...[
-            FilledButton.icon(
-              onPressed: _createUser,
-              icon: const Icon(Icons.person_add_outlined),
-              label: Text(context.l10n.adminNewUser),
+            Card(
+              child: Padding(
+                padding: const EdgeInsets.all(16),
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: [
+                    Text('Användarkonton', style: theme.textTheme.titleMedium),
+                    const SizedBox(height: 8),
+                    Text(
+                      'Här styr du konton, roller, premium och delning. När listan är tom kan du skapa den första användaren direkt.',
+                      style: theme.textTheme.bodyMedium,
+                    ),
+                    const SizedBox(height: 12),
+                    FilledButton.icon(
+                      onPressed: _createUser,
+                      icon: const Icon(Icons.person_add_outlined),
+                      label: Text(context.l10n.adminNewUser),
+                    ),
+                  ],
+                ),
+              ),
             ),
             const SizedBox(height: 16),
           ],
-          Text(context.l10n.adminNoUsers),
+          Card(
+            child: Padding(
+              padding: const EdgeInsets.all(16),
+              child: Text(context.l10n.adminNoUsers),
+            ),
+          ),
         ],
       );
     }
@@ -354,14 +369,36 @@ class _AdminUsersPanelState extends ConsumerState<AdminUsersPanel> {
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
         children: [
+          Card(
+            child: Padding(
+              padding: const EdgeInsets.all(16),
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.start,
+                children: [
+                  Text('Användarkonton', style: theme.textTheme.titleMedium),
+                  const SizedBox(height: 8),
+                  Text(
+                    context.l10n.adminUsersDescription,
+                    style: theme.textTheme.bodyMedium,
+                  ),
+                  const SizedBox(height: 8),
+                  const Wrap(
+                    spacing: 8,
+                    runSpacing: 8,
+                    children: [
+                      Chip(label: Text('Roller')),
+                      Chip(label: Text('Premium')),
+                      Chip(label: Text('Delning')),
+                    ],
+                  ),
+                ],
+              ),
+            ),
+          ),
+          const SizedBox(height: 12),
           Row(
             children: [
-              Expanded(
-                child: Text(
-                  context.l10n.adminUsersDescription,
-                  style: theme.textTheme.bodyMedium,
-                ),
-              ),
+              const Spacer(),
               IconButton(
                 icon: const Icon(Icons.refresh),
                 tooltip: 'Uppdatera',
@@ -561,7 +598,13 @@ class _CreateUserDialogState extends State<_CreateUserDialog> {
         child: SingleChildScrollView(
           child: Column(
             mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
             children: [
+              Text(
+                'Skapa ett nytt konto med tydlig roll direkt från adminvyn. Du väljer bara uppgifter som krävs för inloggning och åtkomst.',
+                style: Theme.of(context).textTheme.bodyMedium,
+              ),
+              const SizedBox(height: 12),
               TextFormField(
                 controller: _usernameCtrl,
                 decoration: InputDecoration(labelText: context.l10n.profileUsernameLabel),