feat: centralize top HUD banners, richer tutorial, and UX polish

feat: first-launch tutorial, start-line coaching, and pad bounce polish

feat: pop steering pads when Lofer/Abattre sides swap on tack/gybe

feat: mobile hardening (disable long-press callout, zoom, tap flash)

feat: shorten finish-screen debrief lines

feat: painterly sea, refined tiller, tabbed finish screen + top-5 leaderboard

feat: randomized practice course, richer finish screen, modular engine

feat: regatta course, training mode, finish debrief + modularize game

feat: add top-10 leaderboard backed by a Hugging Face dataset

fix: tiller widget swings opposite to the turn (barre franche behavior)

feat: add start modal with mode selection, show distance in nautical miles

feat: show distance sailed below speed in the HUD

feat: add easy-mode points-of-sail ring and polish HUD

feat: Glénans sailing maneuver simulator