- Add phased onboarding walkthrough: Phase 1 guides enabling the Safari extension, Phase 2 is a 4-step wizard showing how to use SpeedReader in Safari
- Platform-specific views for iOS (swipeable pages) and macOS (stepped navigation with Back button)
- Stylized SwiftUI diagrams (Safari address bar, toolbar, extension menu, RSVP preview)
- On-device funnel tracking via App Group UserDefaults (phase, step, completion, replays, first activation)
- How to Use in Safari button in Settings replays the walkthrough
- First extension activation detection via native messaging bridge
- Backward-compatible migration from legacy onboarding boolean