feat: add meal planning feature with API integration

- Introduced MealPlanApiPaths for handling meal plan related API endpoints.
- Added MealPlanScreen for displaying and managing meal plans.
- Implemented MealPlanRepository for fetching and updating meal plan data.
- Created data models: MealPlanEntry, MealPlanRecipe, InventoryCompareItem, ShoppingItem, and MealPlanDashboard.
- Integrated meal plan functionality into the app router and UI.
- Updated localization files for meal plan related strings in English and Swedish.
- Added state management for meal plan using Riverpod.

flutter/lib/core/api/api_paths.dart

@@ -26,4 +26,20 @@ class InventoryApiPaths {
 class PantryApiPaths {
   static const list = '/pantry';
   static String remove(int id) => '/pantry/$id';
+}
+
+class MealPlanApiPaths {
+  static const list = '/meal-plan';
+
+  static String listByRange(String from, String to) =>
+    '$list?from=${Uri.encodeQueryComponent(from)}&to=${Uri.encodeQueryComponent(to)}';
+
+  static String shoppingList(String from, String to) =>
+    '$list/shopping-list?from=${Uri.encodeQueryComponent(from)}&to=${Uri.encodeQueryComponent(to)}';
+
+  static String inventoryCompare(String from, String to) =>
+    '$list/inventory-compare?from=${Uri.encodeQueryComponent(from)}&to=${Uri.encodeQueryComponent(to)}';
+
+  static String removeByDate(String date) =>
+    '$list/${Uri.encodeComponent(date)}';
 }

flutter/lib/core/router/app_router.dart

@@ -17,6 +17,7 @@ import '../../features/inventory/presentation/create_inventory_screen.dart';
 import '../../features/inventory/presentation/inventory_edit_screen.dart';
 import '../../features/inventory/presentation/consume_inventory_screen.dart';
 import '../../features/inventory/presentation/consumption_history_screen.dart';
+import '../../features/meal_plan/presentation/meal_plan_screen.dart';
 import '../../features/pantry/presentation/pantry_screen.dart';
 
 final appRouterProvider = Provider<GoRouter>((ref) {
@@ -159,6 +160,10 @@ final appRouterProvider = Provider<GoRouter>((ref) {
             path: '/inventory',
             builder: (context, state) => const InventoryScreen(),
           ),
+          GoRoute(
+            path: '/matsedel',
+            builder: (context, state) => const MealPlanScreen(),
+          ),
           GoRoute(
             path: '/baslager',
             builder: (context, state) => const PantryScreen(),

flutter/lib/core/ui/app_shell.dart

@@ -27,6 +27,12 @@ class AppShell extends ConsumerWidget {
       icon: Icons.inventory_2_outlined,
       label: 'Inventarie',
     ),
+    _AppDestination(
+      path: '/matsedel',
+      title: 'Matsedel',
+      icon: Icons.calendar_month_outlined,
+      label: 'Matsedel',
+    ),
     _AppDestination(
       path: '/baslager',
       title: 'Baslager',