Add onboarding UI tests and improve app data management

- Add Suite0_OnboardingTests with fresh install and login test flows
- Add accessibility identifiers to onboarding views for UI testing
- Remove deprecated DataCache in favor of unified DataManager
- Update API layer to support public upgrade-triggers endpoint
- Improve onboarding first task view with better date handling
- Update various views with accessibility identifiers for testing
- Fix subscription feature comparison view layout
- Update document detail view improvements

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

iosApp/CaseraUITests/AccessibilityIdentifiers.swift

@@ -172,6 +172,65 @@ struct AccessibilityIdentifiers {
         static let downloadButton = "DocumentDetail.DownloadButton"
     }
 
+    // MARK: - Onboarding
+    struct Onboarding {
+        // Welcome Screen
+        static let welcomeTitle = "Onboarding.WelcomeTitle"
+        static let startFreshButton = "Onboarding.StartFreshButton"
+        static let joinExistingButton = "Onboarding.JoinExistingButton"
+        static let loginButton = "Onboarding.LoginButton"
+
+        // Value Props Screen
+        static let valuePropsTitle = "Onboarding.ValuePropsTitle"
+        static let valuePropsNextButton = "Onboarding.ValuePropsNextButton"
+
+        // Name Residence Screen
+        static let nameResidenceTitle = "Onboarding.NameResidenceTitle"
+        static let residenceNameField = "Onboarding.ResidenceNameField"
+        static let nameResidenceContinueButton = "Onboarding.NameResidenceContinueButton"
+
+        // Create Account Screen
+        static let createAccountTitle = "Onboarding.CreateAccountTitle"
+        static let appleSignInButton = "Onboarding.AppleSignInButton"
+        static let emailSignUpExpandButton = "Onboarding.EmailSignUpExpandButton"
+        static let usernameField = "Onboarding.UsernameField"
+        static let emailField = "Onboarding.EmailField"
+        static let passwordField = "Onboarding.PasswordField"
+        static let confirmPasswordField = "Onboarding.ConfirmPasswordField"
+        static let createAccountButton = "Onboarding.CreateAccountButton"
+        static let loginLinkButton = "Onboarding.LoginLinkButton"
+
+        // Verify Email Screen
+        static let verifyEmailTitle = "Onboarding.VerifyEmailTitle"
+        static let verificationCodeField = "Onboarding.VerificationCodeField"
+        static let verifyButton = "Onboarding.VerifyButton"
+
+        // Join Residence Screen
+        static let joinResidenceTitle = "Onboarding.JoinResidenceTitle"
+        static let shareCodeField = "Onboarding.ShareCodeField"
+        static let joinResidenceButton = "Onboarding.JoinResidenceButton"
+
+        // First Task Screen
+        static let firstTaskTitle = "Onboarding.FirstTaskTitle"
+        static let taskSelectionCounter = "Onboarding.TaskSelectionCounter"
+        static let addPopularTasksButton = "Onboarding.AddPopularTasksButton"
+        static let addTasksContinueButton = "Onboarding.AddTasksContinueButton"
+        static let taskCategorySection = "Onboarding.TaskCategorySection"
+        static let taskTemplateRow = "Onboarding.TaskTemplateRow"
+
+        // Subscription Screen
+        static let subscriptionTitle = "Onboarding.SubscriptionTitle"
+        static let yearlyPlanCard = "Onboarding.YearlyPlanCard"
+        static let monthlyPlanCard = "Onboarding.MonthlyPlanCard"
+        static let startTrialButton = "Onboarding.StartTrialButton"
+        static let continueWithFreeButton = "Onboarding.ContinueWithFreeButton"
+
+        // Navigation
+        static let backButton = "Onboarding.BackButton"
+        static let skipButton = "Onboarding.SkipButton"
+        static let progressIndicator = "Onboarding.ProgressIndicator"
+    }
+
     // MARK: - Profile
     struct Profile {
         static let logoutButton = "Profile.LogoutButton"