- ProgressBar: full-width played/remaining bar in the player pane, click-to-seek;
waveform no longer handles seeking or the played/future color split (pure visual)
- bars: 2 terminal rows per bar (16 levels) via barChars, partial block in the
top row so the column renders continuously
- fix bars maxing at audio start: disable cava autosens (silence gain-ramp),
pre-warm the malloc'd FFT window with zeros, skip partial FFT windows
- createBarScaler peak follower + power curve replaces cava autosens for
level-to-height mapping (src/utils/bar-mapping.ts, unit-tested)
