feat(recipes): add recipe visibility and sharing features

- Implemented functionality to set recipe visibility (public/private) with appropriate checks for user permissions.
- Added ability to share recipes with other users, including validation for existing users and permissions.
- Introduced new DTOs for setting visibility and sharing recipes.
- Updated RecipesController and RecipesService to handle new endpoints for visibility and sharing.
- Enhanced inventory preview to consider user permissions and shared recipes.
- Updated front-end to support new sharing and visibility features, including UI changes for recipe detail and admin user management.

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

@@ -81,6 +81,26 @@ class _AdminUsersPanelState extends ConsumerState<AdminUsersPanel> {
     }
   }
 
+  Future<void> _toggleRecipeSharing(UserAdmin user) async {
+    final newValue = !user.canShareRecipes;
+    final confirmed = await _confirm(
+      context,
+      newValue ? 'Tillåt receptdelning' : 'Blockera receptdelning',
+      '${newValue ? 'Tillåt' : 'Blockera'} receptdelning för ${user.username}?',
+    );
+    if (!confirmed || !mounted) return;
+    try {
+      await ref
+          .read(adminRepositoryProvider)
+          .setRecipeSharing(user.id, canShareRecipes: newValue);
+      if (!mounted) return;
+      _load();
+    } catch (e) {
+      if (!mounted) return;
+      _showError(e);
+    }
+  }
+
   Future<void> _resetPassword(UserAdmin user) async {
     final confirmed = await _confirm(
       context,
@@ -319,6 +339,7 @@ class _AdminUsersPanelState extends ConsumerState<AdminUsersPanel> {
         user: _users[i],
         onChangeRole: () => _changeRole(_users[i]),
         onTogglePremium: () => _togglePremium(_users[i]),
+        onToggleRecipeSharing: () => _toggleRecipeSharing(_users[i]),
         onEditEmail: () => _editEmail(_users[i]),
         onResetPassword: () => _resetPassword(_users[i]),
         onDelete: () => _deleteUser(_users[i]),
@@ -364,6 +385,7 @@ class _UserTile extends StatelessWidget {
   final UserAdmin user;
   final VoidCallback onChangeRole;
   final VoidCallback onTogglePremium;
+  final VoidCallback onToggleRecipeSharing;
   final VoidCallback onEditEmail;
   final VoidCallback onResetPassword;
   final VoidCallback onDelete;
@@ -372,6 +394,7 @@ class _UserTile extends StatelessWidget {
     required this.user,
     required this.onChangeRole,
     required this.onTogglePremium,
+    required this.onToggleRecipeSharing,
     required this.onEditEmail,
     required this.onResetPassword,
     required this.onDelete,
@@ -418,6 +441,16 @@ class _UserTile extends StatelessWidget {
                     backgroundColor: theme.colorScheme.tertiaryContainer,
                   ),
                 ],
+                const SizedBox(width: 4),
+                Chip(
+                  label: Text(user.canShareRecipes ? 'Delning: På' : 'Delning: Av'),
+                  padding: EdgeInsets.zero,
+                  visualDensity: VisualDensity.compact,
+                  labelStyle: theme.textTheme.labelSmall,
+                  backgroundColor: user.canShareRecipes
+                      ? theme.colorScheme.secondaryContainer
+                      : theme.colorScheme.errorContainer,
+                ),
               ],
             ),
           ],
@@ -432,6 +465,9 @@ class _UserTile extends StatelessWidget {
               case 'premium':
                 onTogglePremium();
                 break;
+              case 'sharing':
+                onToggleRecipeSharing();
+                break;
               case 'email':
                 onEditEmail();
                 break;
@@ -454,6 +490,14 @@ class _UserTile extends StatelessWidget {
               value: 'premium',
               child: Text(user.isPremium ? 'Ta bort Premium' : 'Ge Premium'),
             ),
+            PopupMenuItem(
+              value: 'sharing',
+              child: Text(
+                user.canShareRecipes
+                    ? 'Blockera receptdelning'
+                    : 'Tillåt receptdelning',
+              ),
+            ),
             const PopupMenuItem(
               value: 'email',
               child: Text('Ändra e-post'),