feat: implement grid layout for recipes with column selection and improve pantry product picker

Co-authored-by: Copilot <copilot@github.com>

flutter/lib/core/ui/app_shell.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
 import '../../features/auth/data/auth_providers.dart';
+import '../../features/recipes/data/recipes_grid_provider.dart';
 
 const _adminDestination = _AppDestination(
   path: '/admin',
@@ -94,10 +95,26 @@ class AppShell extends ConsumerWidget {
       }
     }
 
+    final isRecipesRoute = location.startsWith('/recipes') &&
+        !location.startsWith('/recipes/');
+
     return Scaffold(
       appBar: AppBar(
         title: Text(selectedDestination.title),
         actions: [
+          if (isRecipesRoute)
+            PopupMenuButton<int>(
+              icon: const Icon(Icons.grid_view),
+              tooltip: 'Välj antal kolumner',
+              onSelected: (columns) =>
+                  ref.read(recipesGridProvider.notifier).setColumns(columns),
+              itemBuilder: (context) => const [
+                PopupMenuItem(value: 2, child: Text('2 kolumner')),
+                PopupMenuItem(value: 4, child: Text('4 kolumner')),
+                PopupMenuItem(value: 6, child: Text('6 kolumner')),
+                PopupMenuItem(value: 8, child: Text('8 kolumner')),
+              ],
+            ),
           IconButton(
             tooltip: 'Logga ut',
             icon: const Icon(Icons.logout),

flutter/lib/features/recipes/data/recipes_grid_provider.dart

@@ -0,0 +1,21 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+const _prefsKey = 'recipes_grid_columns';
+
+class RecipesGridNotifier extends AsyncNotifier<int> {
+  @override
+  Future<int> build() async {
+    final prefs = await SharedPreferences.getInstance();
+    return prefs.getInt(_prefsKey) ?? 2;
+  }
+
+  Future<void> setColumns(int columns) async {
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setInt(_prefsKey, columns);
+    state = AsyncData(columns);
+  }
+}
+
+final recipesGridProvider =
+    AsyncNotifierProvider<RecipesGridNotifier, int>(RecipesGridNotifier.new);

flutter/lib/features/recipes/presentation/recipes_screen.dart

@@ -1,104 +1,55 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
-import 'package:shared_preferences/shared_preferences.dart';
 
 import '../../../core/api/api_error_mapper.dart';
 import '../../../core/ui/async_state_views.dart';
 import '../data/recipe_providers.dart';
+import '../data/recipes_grid_provider.dart';
 
-class RecipesScreen extends ConsumerStatefulWidget {
+class RecipesScreen extends ConsumerWidget {
   const RecipesScreen({super.key});
 
   @override
-  ConsumerState<RecipesScreen> createState() => _RecipesScreenState();
-}
-
-class _RecipesScreenState extends ConsumerState<RecipesScreen> {
-  int _selectedColumns = 2;
-
-  @override
-  void initState() {
-    super.initState();
-    _loadSelectedColumns();
-  }
-
-  Future<void> _loadSelectedColumns() async {
-    final prefs = await SharedPreferences.getInstance();
-    setState(() {
-      _selectedColumns = prefs.getInt('selectedColumns') ?? 2;
-    });
-  }
-
-  Future<void> _saveSelectedColumns(int columns) async {
-    final prefs = await SharedPreferences.getInstance();
-    await prefs.setInt('selectedColumns', columns);
-  }
-
-  @override
-  Widget build(BuildContext context) {
+  Widget build(BuildContext context, WidgetRef ref) {
     final recipesAsync = ref.watch(recipesProvider);
+    final columns = ref.watch(recipesGridProvider).maybeWhen(
+          data: (v) => v,
+          orElse: () => 2,
+        );
 
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('Recept'),
-        actions: [
-          PopupMenuButton<int>(
-            icon: const Icon(Icons.grid_view),
-            tooltip: 'Välj antal kolumner',
-            onSelected: (int columns) {
-              setState(() {
-                _selectedColumns = columns;
-              });
-              _saveSelectedColumns(columns);
-            },
-            itemBuilder: (BuildContext context) => <PopupMenuEntry<int>>[
-              const PopupMenuItem<int>(
-                value: 2,
-                child: Text('2 kolumner'),
-              ),
-              const PopupMenuItem<int>(
-                value: 4,
-                child: Text('4 kolumner'),
-              ),
-              const PopupMenuItem<int>(
-                value: 6,
-                child: Text('6 kolumner'),
-              ),
-              const PopupMenuItem<int>(
-                value: 8,
-                child: Text('8 kolumner'),
-              ),
-            ],
+    return Stack(
+      children: [
+        recipesAsync.when(
+          loading: () => const LoadingStateView(label: 'Laddar recept...'),
+          error: (error, _) => ErrorStateView(
+            message: mapErrorToUserMessage(error, context),
+            onRetry: () => ref.invalidate(recipesProvider),
           ),
-        ],
-      ),
-      body: recipesAsync.when(
-        loading: () => const LoadingStateView(label: 'Laddar recept...'),
-        error: (error, _) => ErrorStateView(
-          message: mapErrorToUserMessage(error, context),
-          onRetry: () => ref.invalidate(recipesProvider),
-        ),
-        data: (recipes) {
-          if (recipes.isEmpty) {
-            return const EmptyStateView(
-              title: 'Inga recept hittades',
-              description: 'Lägg till ett recept för att komma igång.',
-            );
-          }
+          data: (recipes) {
+            if (recipes.isEmpty) {
+              return const EmptyStateView(
+                title: 'Inga recept hittades',
+                description: 'Lägg till ett recept för att komma igång.',
+              );
+            }
 
-          return GridView.count(
-            crossAxisCount: _selectedColumns,
-            children: List.generate(
-              recipes.length,
-              (index) {
+            return GridView.builder(
+              padding: const EdgeInsets.only(bottom: 88),
+              gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
+                crossAxisCount: columns,
+                crossAxisSpacing: 4,
+                mainAxisSpacing: 4,
+              ),
+              itemCount: recipes.length,
+              itemBuilder: (context, index) {
                 final recipe = recipes[index];
                 return GestureDetector(
                   onTap: () => context.push('/recipes/${recipe.id}'),
                   child: Container(
-                    margin: const EdgeInsets.all(4.0),
                     decoration: BoxDecoration(
                       borderRadius: BorderRadius.circular(8.0),
+                      color: Colors.grey[200],
                       image: recipe.imageUrl != null
                           ? DecorationImage(
                               image: NetworkImage(recipe.imageUrl!),
@@ -107,20 +58,24 @@ class _RecipesScreenState extends ConsumerState<RecipesScreen> {
                           : null,
                     ),
                     child: recipe.imageUrl == null
-                        ? const Center(child: Icon(Icons.restaurant))
+                        ? const Center(child: Icon(Icons.restaurant, size: 32))
                         : null,
                   ),
                 );
               },
-            ),
-          );
-        },
-      ),
-      floatingActionButton: FloatingActionButton(
-        tooltip: 'Nytt recept',
-        onPressed: () => context.push('/recipes/create'),
-        child: const Icon(Icons.add),
-      ),
+            );
+          },
+        ),
+        Positioned(
+          right: 16,
+          bottom: 16,
+          child: FloatingActionButton(
+            tooltip: 'Nytt recept',
+            onPressed: () => context.push('/recipes/create'),
+            child: const Icon(Icons.add),
+          ),
+        ),
+      ],
     );
   }
 }