- Raise portal z-index to z-50 so it covers MobileBottomNav
- Use TG SDK bottom safe area (JS) via CSS variable instead of unreliable env()
- Fix TicketNotificationBell regression: conditional inline style for fullscreen only
- Add bottom safe area padding to detail panel scroll areas
- Extract useHeaderHeight() hook — single source of truth for header
height across AppShell, ReferralNetwork, and TicketNotificationBell
- Portal top offset now computed dynamically from TG safe area insets
instead of hardcoded top-16 (fixes overlap with TG header bar)
- Two-row mobile layout: title + selector on separate rows so dropdown
gets full width on small screens
- Add MOBILE_HEADER_HEIGHT_PX and DESKTOP_HEADER_HEIGHT_PX to constants
- Fix TicketNotificationBell using hardcoded 45px for all platforms
