User design (round 3): one set of big buttons does the big navigation.
The outer prev/next step buttons were chapter-only even on podcasts,
while episode nav hid as small icons in the top-left cluster. Now:
- Podcasts (sequence context present): the outer buttons navigate
EPISODES via goToPrev/goToNextEpisode (progress pushed before the
hop); disabled ghost buttons at the first/last episode keep the row
shape. Embedded-chapter jumps stay on the Chapter pill's list.
- Books: unchanged chapter stepping.
- Keyboard (h/l shortcuts) and hardware media keys (MediaTrackPrev/
Next) funnel through stepChapter, which is now sequence-aware —
headset next-track = next episode on podcasts.
- The top-left episode icons are gone; the 'Ep N/M' counter stays.
- Help-modal labels say 'chapter, or episode on podcasts'.
Same icons both modes (extracted audioStepPrev/NextIcon partials);
books are untouched — no sequence context, byte-identical behavior.
John O'Keefe
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