feat(app): wire the voyage together

Controller drives world and curtain; caption with Back to sea; play,
previous and next in the timeline bar; keyboard; no-WebGL frieze stage.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/plans/002-voyage-app.md

@@ -185,7 +185,7 @@ export function transitionFor(fromSongId: string, toSongId: string): Step;
 ```
 Controller: subscribes to the store; runs `transitionFor` → curtain/fade → `world.sailTo` → `world.setLanding`; a newer request cancels the running one (generation counter) and the last request wins; Play voyage advances every 3.4s (silent) and stops on user input; ←/→ prev/next song; Esc closes reading view, else leaves a landing; caption card shows saga · story time and song title; no WebGL → `createWorld` null → frieze of the current saga stays as the stage with a note "3D needs WebGL — browsing with the frieze"; `prefers-reduced-motion` → every transition is a 200ms crossfade.
 
-- [ ] Steps: failing tests — `transitionFor` cases (polyphemus→survive sail + cave; full-speed-ahead→polyphemus? (troy→cyclops adjacent) curtain cyclops; storm→god-games fade + arena; survive→remember-them sail + null); controller with a fake world: five rapid `set({songId})` calls end with the world at the last song and the curtain lifted; no-WebGL path renders the note → implement → pass → full-app screenshots (below) → commit `feat(app): voyage controller`.
+- [x] Steps: failing tests — `transitionFor` cases (polyphemus→survive sail + cave; full-speed-ahead→polyphemus? (troy→cyclops adjacent) curtain cyclops; storm→god-games fade + arena; survive→remember-them sail + null); controller with a fake world: five rapid `set({songId})` calls end with the world at the last song and the curtain lifted; no-WebGL path renders the note → implement → pass → full-app screenshots (below) → commit `feat(app): voyage controller`.
 
 ### Task 8: Docs, verification, deploy