New game mode 'assist' — no trainer, no scoring:
- Large display of the currently mic-detected note
- Live notation staff (same pipeline as the pitch monitor)
- Live fretboard showing alternative positions for the played note
(respects the fret-window practice filter)
- Tuner and Metronome remain the shared footer tools, identical in
all modes; user can practice own-pace from paper with a free
metronome
Header mode toggle gains 'Assist'; 'm' shortcut cycles back to sight
reading from assist/phrase. Export PitchData type.
- color-scheme per theme so native controls (selects, checkboxes, number
inputs, sliders) render dark-native instead of black-on-black.
- Themed .control-select text color; new .control-input class replaces
hardcoded white-on-black inline input styles.
- Tuner widget stays mounted when enabled: idle state (dimmed, needle parked,
'—') instead of appearing/disappearing. Fully theme-var based (was
hardcoded white — invisible in light mode).
- Remove CSS transitions on per-frame values (tuner needle, level meter):
transitions interrupted 60x/sec are left stuck by WebKit/Safari; the
display EMA from the detection loop replaces them.
- VexFlow notation: resolve CSS var() to concrete colors (SVG attributes
can't resolve var(), silently fell back to black) and override VexFlow's
hardcoded #444 ledger-line default; re-render on theme changes
(useLayoutEffect so children read the updated attribute in time).
- Themed switch toggles (were hardcoded #ddd / white — glowed in dark mode).
- Fixed-height pitch readout so the layout stops jumping when a note starts
or stops sounding.
- Split SettingsContext into context/Provider/hook files (fast-refresh);
memoized provider functions; typed webkitAudioContext; prefer-const;
removed 'as any' casts. ESLint now passes clean.
