Fix category handling, recipe management, and dark mode toggle tint

- Map uncategorized category between * (internal) and empty string
  (API) so selecting Sonstige/Other correctly persists to the server
- Default new recipes to Other (*) category and remove None option
- Add "New Category" option to category picker in recipe edit view
- Include newly created/imported recipes in recently viewed list and
  pre-fetch thumbnails so images display immediately
- Remove deleted recipes from recently viewed list
- Remove broad .tint(.primary) from RecipeTabView that caused white
  toggles in Settings during dark mode
- Rename German "Other" translation from Andere to Sonstige
- Add missing translations for Servings stepper and new category strings

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

Nextcloud Cookbook iOS Client/Views/Recipes/RecipeViewSections/RecipeMetadataSection.swift

@@ -33,9 +33,8 @@ struct RecipeMetadataSection: View {
                     .textFieldStyle(.roundedBorder)
                     
                 Picker("Choose", selection: $viewModel.observableRecipeDetail.recipeCategory) {
-                    Text("").tag("")
                     ForEach(categories, id: \.self) { item in
-                        Text(item)
+                        Text(item == "*" ? String(localized: "Other") : item).tag(item)
                     }
                 }
                 .pickerStyle(.menu)
@@ -93,19 +92,50 @@ struct RecipeEditMetadataSection: View {
     @EnvironmentObject var appState: AppState
     @ObservedObject var viewModel: RecipeView.ViewModel
 
+    @State private var showNewCategoryAlert = false
+    @State private var newCategoryName = ""
+
+    private let newCategoryTag = "\0_new_category_"
+
     var categories: [String] {
-        appState.categories.map { $0.name }
+        var list = appState.categories.map { $0.name }
+        let current = viewModel.observableRecipeDetail.recipeCategory
+        if !current.isEmpty && current != newCategoryTag && !list.contains(current) {
+            list.append(current)
+        }
+        return list
     }
 
     var body: some View {
         Section("Details") {
             Picker("Category", selection: $viewModel.observableRecipeDetail.recipeCategory) {
-                Text("None").tag("")
                 ForEach(categories, id: \.self) { item in
-                    Text(item).tag(item)
+                    Text(item == "*" ? String(localized: "Other") : item).tag(item)
                 }
+                Divider()
+                Text("New Category…").tag(newCategoryTag)
             }
             .pickerStyle(.menu)
+            .onChange(of: viewModel.observableRecipeDetail.recipeCategory) { _, newValue in
+                if newValue == newCategoryTag {
+                    newCategoryName = ""
+                    showNewCategoryAlert = true
+                }
+            }
+            .alert("New Category", isPresented: $showNewCategoryAlert) {
+                TextField("Category name", text: $newCategoryName)
+                Button("Cancel", role: .cancel) {
+                    viewModel.observableRecipeDetail.recipeCategory = "*"
+                }
+                Button("Add") {
+                    let trimmed = newCategoryName.trimmingCharacters(in: .whitespacesAndNewlines)
+                    if !trimmed.isEmpty {
+                        viewModel.observableRecipeDetail.recipeCategory = trimmed
+                    } else {
+                        viewModel.observableRecipeDetail.recipeCategory = "*"
+                    }
+                }
+            }
 
             Stepper("Servings: \(viewModel.observableRecipeDetail.recipeYield)", value: $viewModel.observableRecipeDetail.recipeYield, in: 1...99)