Redesign iOS onboarding UI with improved visuals and engagement

- Reorder flow: Welcome → Features → Name Residence → Account → Tasks → Upsell
- Features screen: 4 animated cards with stats, gradient icons, playful copy
- Name residence: Add name suggestions, gradient borders, encouraging text
- Task templates: Multi-select with 24 tasks in 6 categories, accordion UI
- Subscription upsell: Plan selection, animated crown, social proof, benefits

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

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

iosApp/iosApp/Onboarding/OnboardingCoordinator.swift

@@ -101,11 +101,12 @@ struct OnboardingCoordinator: View {
     }
 
     /// Current step index for progress indicator (0-based)
+    /// Flow: Welcome → Features → Name Residence → Create Account → Verify → Tasks → Upsell
     private var currentProgressStep: Int {
         switch onboardingState.currentStep {
         case .welcome: return 0
-        case .nameResidence: return 1
-        case .valueProps: return 2
+        case .valueProps: return 1
+        case .nameResidence: return 2
         case .createAccount: return 3
         case .verifyEmail: return 4
         case .joinResidence: return 4
@@ -145,16 +146,17 @@ struct OnboardingCoordinator: View {
     }
 
     private func handleBack() {
+        // Flow: Welcome → Features → Name Residence → Create Account → Verify → Tasks → Upsell
         switch onboardingState.currentStep {
-        case .nameResidence:
-            goBack(to: .welcome)
         case .valueProps:
-            goBack(to: .nameResidence)
+            goBack(to: .welcome)
+        case .nameResidence:
+            goBack(to: .valueProps)
         case .createAccount:
             if onboardingState.userIntent == .joinExisting {
                 goBack(to: .welcome)
             } else {
-                goBack(to: .valueProps)
+                goBack(to: .nameResidence)
             }
         case .verifyEmail:
             AuthenticationManager.shared.logout()