refactor: add color assets and update UI components

Mayday/ViewModels/AuthViewModel.swift

@@ -1,13 +1,14 @@
 import Foundation
 import SwiftUI
 
+@Observable
 @MainActor
-class AuthViewModel: ObservableObject {
-    @Published var isAuthenticated = false
-    @Published var isCheckingAuth = true
-    @Published var currentUser: UserResponse?
-    @Published var isLoading = false
-    @Published var error: String?
+final class AuthViewModel {
+    var isAuthenticated = false
+    var isCheckingAuth = true
+    var currentUser: UserResponse?
+    var isLoading = false
+    var error: String?
 
     private let auth = AuthService.shared
     private let keychain = KeychainService.shared

Mayday/ViewModels/NotificationsViewModel.swift

@@ -2,16 +2,25 @@ import Foundation
 import SwiftUI
 import UIKit
 
+@Observable
 @MainActor
-class NotificationsViewModel: ObservableObject {
-    @Published var notifications: [AppNotification] = []
-    @Published var unreadCount = 0
-    @Published var isLoading = false
-    @Published var isLoadingMore = false
-    @Published var error: String?
-    @Published var hasMore = true
+final class NotificationsViewModel {
+    var notifications: [AppNotification] = []
+    var unreadCount = 0
+    var isLoading = false
+    var isLoadingMore = false
+    var error: String?
+    var hasMore = true
     private var hasLoadedOnce = false
 
+    var unreadNotifications: [AppNotification] {
+        notifications.filter { !$0.isRead }
+    }
+
+    var readNotifications: [AppNotification] {
+        notifications.filter { $0.isRead }
+    }
+
     private let service = NotificationsAPIService.shared
     private let limit = 50
     private var currentOffset = 0

Mayday/ViewModels/SettingsViewModel.swift

@@ -1,12 +1,13 @@
 import Foundation
 import SwiftUI
 
+@Observable
 @MainActor
-class SettingsViewModel: ObservableObject {
-    @Published var sessions: [SessionResponse] = []
-    @Published var isLoading = false
-    @Published var error: String?
-    @Published var successMessage: String?
+final class SettingsViewModel {
+    var sessions: [SessionResponse] = []
+    var isLoading = false
+    var error: String?
+    var successMessage: String?
 
     private let service = NotificationsAPIService.shared