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/features/meal_plan/domain/meal_plan_dashboard.dart

@@ -0,0 +1,26 @@
+import 'inventory_compare_item.dart';
+import 'meal_plan_entry.dart';
+import 'shopping_item.dart';
+
+class MealPlanDashboard {
+  final List<MealPlanEntry> entries;
+  final List<ShoppingItem> shoppingItems;
+  final List<InventoryCompareItem> inventoryCompareItems;
+
+  const MealPlanDashboard({
+    required this.entries,
+    required this.shoppingItems,
+    required this.inventoryCompareItems,
+  });
+
+  MealPlanEntry? entryForDate(DateTime date) {
+    final normalized = DateTime(date.year, date.month, date.day);
+    for (final entry in entries) {
+      final entryDate = DateTime(entry.date.year, entry.date.month, entry.date.day);
+      if (entryDate == normalized) {
+        return entry;
+      }
+    }
+    return null;
+  }
+}