Add Share Extension for importing recipes via URL

Adds a Share Extension so users can share URLs from Safari (or any app)
to open the main app with the ImportURLSheet pre-filled. Uses a custom
URL scheme (nextcloud-cookbook://) as the bridge between the extension
and the main app.

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

Nextcloud Cookbook iOS Client/Views/MainView.swift

@@ -20,6 +20,8 @@ struct MainView: View {
 
     @State private var selectedTab: Tab = .recipes
 
+    @Binding var pendingImportURL: String?
+
     enum Tab {
         case recipes, search, mealPlan, groceryList
     }
@@ -106,5 +108,19 @@ struct MainView: View {
             }
             recipeViewModel.presentLoadingIndicator = false
         }
+        .onChange(of: pendingImportURL) { _, newURL in
+            guard let url = newURL, !url.isEmpty else { return }
+            selectedTab = .recipes
+            recipeViewModel.pendingImportURL = url
+            // Dismiss any currently open import sheet before re-presenting
+            if recipeViewModel.showImportURLSheet {
+                recipeViewModel.showImportURLSheet = false
+                DispatchQueue.main.asyncAfter(deadline: .now() + 0.3) {
+                    recipeViewModel.showImportURLSheet = true
+                }
+            } else {
+                recipeViewModel.showImportURLSheet = true
+            }
+        }
     }
 }

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

@@ -10,6 +10,7 @@ struct ImportURLSheet: View {
     @Environment(\.dismiss) private var dismiss
 
     var onImport: (RecipeDetail) -> Void
+    var initialURL: String = ""
 
     @State private var url: String = ""
     @State private var isLoading: Bool = false
@@ -62,6 +63,11 @@ struct ImportURLSheet: View {
             } message: {
                 Text(alertMessage)
             }
+            .onAppear {
+                if !initialURL.isEmpty {
+                    url = initialURL
+                }
+            }
         }
     }
 

Nextcloud Cookbook iOS Client/Views/Tabs/RecipeTabView.swift

@@ -255,10 +255,15 @@ struct RecipeTabView: View {
                 }
             }
         }
-        .sheet(isPresented: $viewModel.showImportURLSheet) {
-            ImportURLSheet { recipeDetail in
-                viewModel.navigateToImportedRecipe(recipeDetail: recipeDetail)
-            }
+        .sheet(isPresented: $viewModel.showImportURLSheet, onDismiss: {
+            viewModel.pendingImportURL = nil
+        }) {
+            ImportURLSheet(
+                onImport: { recipeDetail in
+                    viewModel.navigateToImportedRecipe(recipeDetail: recipeDetail)
+                },
+                initialURL: viewModel.pendingImportURL ?? ""
+            )
             .environmentObject(appState)
         }
         .sheet(isPresented: $showManualReorderSheet) {
@@ -303,6 +308,7 @@ struct RecipeTabView: View {
 
         @Published var showImportURLSheet: Bool = false
         @Published var importedRecipeDetail: RecipeDetail? = nil
+        @Published var pendingImportURL: String? = nil
 
         func navigateToSettings() {
             sidebarPath.append(SidebarDestination.settings)