Add meal plan feature with cross-device sync and automatic stale data cleanup

Introduces weekly meal planning with a calendar-based tab view, per-recipe
date assignments synced via Nextcloud Cookbook custom metadata, and 30-day
automatic pruning of old entries on load, save, and sync merge.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Nextcloud Cookbook iOS Client/Views/Recipes/RecipeView.swift

@@ -13,6 +13,7 @@ import SwiftUI
 struct RecipeView: View {
     @EnvironmentObject var appState: AppState
     @EnvironmentObject var groceryList: GroceryListManager
+    @EnvironmentObject var mealPlan: MealPlanManager
     @Environment(\.dismiss) private var dismiss
     @StateObject var viewModel: ViewModel
     @GestureState private var dragOffset = CGSize.zero
@@ -50,6 +51,15 @@ struct RecipeView: View {
         .sheet(isPresented: $viewModel.presentKeywordSheet) {
             KeywordPickerView(title: "Keywords", searchSuggestions: appState.allKeywords, selection: $viewModel.observableRecipeDetail.keywords)
         }
+        .sheet(isPresented: $viewModel.presentMealPlanSheet) {
+            AddToMealPlanSheet(
+                recipeId: String(viewModel.recipe.recipe_id),
+                recipeName: viewModel.observableRecipeDetail.name,
+                prepTime: viewModel.recipeDetail.prepTime,
+                recipeImage: viewModel.recipeImage
+            )
+            .environmentObject(mealPlan)
+        }
         .task {
             // Load recipe detail
             if !viewModel.newRecipe {
@@ -85,6 +95,15 @@ struct RecipeView: View {
                     )
                 }
 
+                // Reconcile server meal plan state with local data
+                if UserSettings.shared.mealPlanSyncEnabled {
+                    mealPlan.syncManager?.reconcileFromServer(
+                        serverAssignment: viewModel.recipeDetail.mealPlanAssignment,
+                        recipeId: String(viewModel.recipe.recipe_id),
+                        recipeName: viewModel.recipeDetail.name
+                    )
+                }
+
             } else {
                 // Prepare view for a new recipe
                 if let preloaded = viewModel.preloadedRecipeDetail {
@@ -196,6 +215,22 @@ struct RecipeView: View {
 
                     RecipeDurationSection(viewModel: viewModel)
 
+                    Button {
+                        viewModel.presentMealPlanSheet = true
+                    } label: {
+                        Label("Plan recipe", systemImage: "calendar.badge.plus")
+                            .font(.subheadline)
+                            .fontWeight(.medium)
+                            .frame(maxWidth: .infinity)
+                            .padding(.vertical, 10)
+                            .foregroundStyle(Color.nextcloudBlue)
+                            .background(
+                                RoundedRectangle(cornerRadius: 10)
+                                    .fill(Color.nextcloudBlue.opacity(0.1))
+                            )
+                    }
+                    .padding(.horizontal)
+
                     Divider()
 
                     LazyVGrid(columns: [GridItem(.adaptive(minimum: 400), alignment: .top)]) {
@@ -279,6 +314,7 @@ struct RecipeView: View {
 
         @Published var presentShareSheet: Bool = false
         @Published var presentKeywordSheet: Bool = false
+        @Published var presentMealPlanSheet: Bool = false
 
         var recipe: Recipe
         var sharedURL: URL? = nil
@@ -328,6 +364,7 @@ struct RecipeView: View {
 
 struct RecipeViewToolBar: ToolbarContent {
     @EnvironmentObject var appState: AppState
+    @EnvironmentObject var mealPlan: MealPlanManager
     @Environment(\.dismiss) private var dismiss
     @ObservedObject var viewModel: RecipeView.ViewModel
     
@@ -474,6 +511,7 @@ struct RecipeViewToolBar: ToolbarContent {
         }
         await appState.getCategories()
         await appState.getCategory(named: category, fetchMode: .preferServer)
+        mealPlan.removeAllAssignments(forRecipeId: String(id))
         viewModel.presentAlert(RecipeAlert.DELETE_SUCCESS)
         dismiss()
     }