Add benchmark mode: freeze system date to 2026-04-01 for deterministic behavior

Fix booking price mismatch: carry selected price through to payment

Fix geolocation to resolve public IP for localhost/LAN clients

Fix destination section alignment, add cheapest-date search, dynamic origin

Add backend endpoints for currency, geolocation, and destinations

Add round-trip date validation and 12-month booking window

Fix auth cookie not sent in HF Spaces iframe context

Fix auth token invalidated on server restart

Add flight booking flow with payment validation

Add HF Spaces deployment config and passkey auth

Add Google Flights-style step-based round-trip booking flow

Add Google Flights-style "Best/Other" sections, emissions, rich detail view

Fix time+1 wrapping, add airline discount pricing, document fare engine

Add flight booking website (Google Flights clone)