refactor: split soundtrack chapter and drive commands

src/audio/journey-music-state.ts

@@ -1,6 +1,6 @@
 import type { SectionId } from '@/content/types';
 import type {
-  AudioJourneyState,
+  AudioInitialState,
   ChapterIntent,
   DriveEnergySample,
   MusicMood,
@@ -40,18 +40,7 @@ export const DEFAULT_DRIVE_ENERGY = Object.freeze({
   source: 'idle',
 } as const satisfies DriveEnergySample);
 
-export function resolveJourneyMusicState(sectionId: string, intensity = 0): AudioJourneyState {
-  const canonicalId = Object.hasOwn(JOURNEY_MUSIC, sectionId)
-    ? sectionId as SectionId
-    : 'start';
-  const chapter = resolveChapterIntent(canonicalId);
-  const finiteIntensity = Number.isFinite(intensity) ? intensity : 0;
-  return Object.freeze({
-    atStart: sectionId === 'start',
-    intensity: Math.min(1, Math.max(0, finiteIntensity)),
-    bias: chapter.mood,
-    entryPhrase: chapter.entryPhrase,
-  });
-}
-
-export const DEFAULT_AUDIO_JOURNEY_STATE = resolveJourneyMusicState('start');
+export const DEFAULT_AUDIO_INITIAL_STATE = Object.freeze({
+  chapter: DEFAULT_CHAPTER_INTENT,
+  drive: DEFAULT_DRIVE_ENERGY,
+} as const satisfies AudioInitialState);