iOS App Architecture Review

Review code changes in app/FlyFunEuroAIP/ for compliance with the architecture defined in designs/IOS_APP_DESIGN.md.

Architecture Rules

1. RZFlight Model Reuse (CRITICAL):

   • Use RZFlight.Airport, RZFlight.Runway, RZFlight.Procedure, RZFlight.AIPEntry directly
   • No duplicate models
   • Query through KnownAirports
   • Extend RZFlight library when functionality is missing

2. Composed AppState:

   • Single source of truth with domain objects
   • Domains: AirportDomain, ChatDomain, NavigationDomain, SystemDomain, SettingsDomain
   • Each domain ~200-400 lines
   • Cross-domain coordination via callbacks
   • Inject via @Environment(\.appState)