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/Suite7_ContractorTests.swift

@@ -519,10 +519,6 @@ final class Suite7_ContractorTests: XCTestCase {
             phoneField.typeText(newPhone)
         }
 
-        // Scroll to more fields
-        app.swipeUp()
-        sleep(1)
-
         // Update email
         let emailField = app.textFields.containing(NSPredicate(format: "placeholderValue CONTAINS[c] 'Email'")).firstMatch
         if emailField.exists {
@@ -558,10 +554,6 @@ final class Suite7_ContractorTests: XCTestCase {
             }
         }
 
-        // Scroll to save button
-        app.swipeUp()
-        sleep(1)
-
         // Save (when editing, button should say "Save")
         let saveButton = app.buttons.containing(NSPredicate(format: "label CONTAINS[c] 'Save'")).firstMatch
         XCTAssertTrue(saveButton.exists, "Save button should exist when editing contractor")