Add category and recipe sorting with multiple modes and order inversion

Categories on the main page can be sorted by Recently Used, Alphabetical,
or Manual (drag-to-reorder). The sort menu appears inline next to the
Categories header. All Recipes is included in the sort order and manual
reorder sheet. Recipes within category and all-recipes lists can be sorted
by Recently Added or Alphabetical, with the sort button in the toolbar.
All non-manual sort modes support order inversion via a Reverse/Default
Order toggle. Date parsing handles both formatted strings and Unix
timestamps, with recipe_id as fallback when dates are unavailable.

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

Nextcloud Cookbook iOS Client/Data/CategorySortMode.swift

@@ -0,0 +1,55 @@
+//
+//  CategorySortMode.swift
+//  Nextcloud Cookbook iOS Client
+//
+
+import Foundation
+
+enum CategorySortMode: String, CaseIterable {
+    case recentlyUsed = "recentlyUsed"
+    case alphabetical = "alphabetical"
+    case manual = "manual"
+
+    func descriptor() -> String {
+        switch self {
+        case .recentlyUsed: return String(localized: "Recently Used")
+        case .alphabetical: return String(localized: "Alphabetical")
+        case .manual: return String(localized: "Manual")
+        }
+    }
+
+    var iconName: String {
+        switch self {
+        case .recentlyUsed: return "clock"
+        case .alphabetical: return "textformat.abc"
+        case .manual: return "line.3.horizontal"
+        }
+    }
+
+    var supportsInvert: Bool {
+        self != .manual
+    }
+
+    static let allValues: [CategorySortMode] = CategorySortMode.allCases
+}
+
+enum RecipeSortMode: String, CaseIterable {
+    case recentlyAdded = "recentlyAdded"
+    case alphabetical = "alphabetical"
+
+    func descriptor() -> String {
+        switch self {
+        case .recentlyAdded: return String(localized: "Recently Added")
+        case .alphabetical: return String(localized: "Alphabetical")
+        }
+    }
+
+    var iconName: String {
+        switch self {
+        case .recentlyAdded: return "clock"
+        case .alphabetical: return "textformat.abc"
+        }
+    }
+
+    static let allValues: [RecipeSortMode] = RecipeSortMode.allCases
+}

Nextcloud Cookbook iOS Client/Data/UserSettings.swift

@@ -151,6 +151,30 @@ class UserSettings: ObservableObject {
         }
     }
 
+    @Published var categorySortMode: String {
+        didSet {
+            UserDefaults.standard.set(categorySortMode, forKey: "categorySortMode")
+        }
+    }
+
+    @Published var categorySortAscending: Bool {
+        didSet {
+            UserDefaults.standard.set(categorySortAscending, forKey: "categorySortAscending")
+        }
+    }
+
+    @Published var recipeSortMode: String {
+        didSet {
+            UserDefaults.standard.set(recipeSortMode, forKey: "recipeSortMode")
+        }
+    }
+
+    @Published var recipeSortAscending: Bool {
+        didSet {
+            UserDefaults.standard.set(recipeSortAscending, forKey: "recipeSortAscending")
+        }
+    }
+
     init() {
         self.username = UserDefaults.standard.object(forKey: "username") as? String ?? ""
         self.token = UserDefaults.standard.object(forKey: "token") as? String ?? ""
@@ -175,6 +199,10 @@ class UserSettings: ObservableObject {
         self.grocerySyncEnabled = UserDefaults.standard.object(forKey: "grocerySyncEnabled") as? Bool ?? true
         self.mealPlanSyncEnabled = UserDefaults.standard.object(forKey: "mealPlanSyncEnabled") as? Bool ?? true
         self.appearanceMode = UserDefaults.standard.object(forKey: "appearanceMode") as? String ?? AppearanceMode.system.rawValue
+        self.categorySortMode = UserDefaults.standard.object(forKey: "categorySortMode") as? String ?? CategorySortMode.recentlyUsed.rawValue
+        self.categorySortAscending = UserDefaults.standard.object(forKey: "categorySortAscending") as? Bool ?? true
+        self.recipeSortMode = UserDefaults.standard.object(forKey: "recipeSortMode") as? String ?? RecipeSortMode.recentlyAdded.rawValue
+        self.recipeSortAscending = UserDefaults.standard.object(forKey: "recipeSortAscending") as? Bool ?? true
 
         if authString == "" {
             if token != "" && username != "" {