Add dark mode support with appearance picker and fix hardcoded colors

Add user-facing appearance setting (System/Light/Dark) wired via
preferredColorScheme at the app root. Replace hardcoded .black tints
and foreground styles with .primary so toolbar buttons and text remain
visible in dark mode. Remove profile picture from settings and
SwiftSoup from acknowledgements.

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

Nextcloud Cookbook iOS Client/Views/SettingsView.swift

@@ -22,30 +22,6 @@ struct SettingsView: View {
     
     var body: some View {
         Form {
-            HStack(alignment: .center) {
-                if let avatarImage = viewModel.avatarImage {
-                    Image(uiImage: avatarImage)
-                        .resizable()
-                        .clipShape(Circle())
-                        .frame(width: 100, height: 100)
-                        
-                }
-                if let userData = viewModel.userData {
-                    VStack(alignment: .leading) {
-                        Text(userData.userDisplayName)
-                            .font(.title)
-                            .padding(.leading)
-                        Text("Username: \(userData.userId)")
-                            .font(.subheadline)
-                            .padding(.leading)
-                        
-                        
-                        // TODO: Add actions
-                    }
-                }
-                Spacer()
-            }
-            
             Section {
                 Picker("Select a default cookbook", selection: $userSettings.defaultCategory) {
                     Text("None").tag("None")
@@ -59,6 +35,16 @@ struct SettingsView: View {
                 Text("The selected cookbook will open on app launch by default.")
             }
 
+            Section {
+                Picker("Appearance", selection: $userSettings.appearanceMode) {
+                    ForEach(AppearanceMode.allValues, id: \.self) { mode in
+                        Text(mode.descriptor()).tag(mode.rawValue)
+                    }
+                }
+            } footer: {
+                Text("Choose whether the app follows the system appearance or always uses light or dark mode.")
+            }
+
             Section {
                 Picker("Grocery list storage", selection: $userSettings.groceryListMode) {
                     ForEach(GroceryListMode.allValues, id: \.self) { mode in
@@ -211,13 +197,6 @@ struct SettingsView: View {
             }
             
             Section(header: Text("Acknowledgements")) {
-                VStack(alignment: .leading) {
-                    if let url = URL(string: "https://github.com/scinfu/SwiftSoup") {
-                        Link("SwiftSoup", destination:  url)
-                            .font(.headline)
-                        Text("An HTML parsing and web scraping library for Swift. Used for importing schema.org recipes from websites.")
-                    }
-                }
                 VStack(alignment: .leading) {
                     if let url = URL(string: "https://github.com/techprimate/TPPDF") {
                         Link("TPPDF", destination: url)
@@ -240,7 +219,6 @@ struct SettingsView: View {
             Text(viewModel.alertType.getMessage())
         }
         .task {
-            await viewModel.getUserData()
             remindersPermission = groceryListManager.remindersPermissionStatus
             if remindersPermission == .fullAccess {
                 reminderLists = groceryListManager.availableReminderLists()
@@ -270,9 +248,6 @@ struct SettingsView: View {
 
 extension SettingsView {
     class ViewModel: ObservableObject {
-        @Published var avatarImage: UIImage? = nil
-        @Published var userData: UserData? = nil
-        
         @Published var showAlert: Bool = false
         fileprivate var alertType: SettingsAlert = .NONE
         
@@ -297,16 +272,6 @@ extension SettingsView {
                 }
             }
         }
-        
-        func getUserData() async {
-            let (data, _) = await NextcloudApi.getAvatar()
-            let (userData, _) = await NextcloudApi.getHoverCard()
-            
-            DispatchQueue.main.async {
-                self.avatarImage = data
-                self.userData = userData
-            }
-        }
     }
 }