docs/USER_GUIDE.md: a full walkthrough of every screen — Tracker (transport,
grid, note-offs, scrolling), the punch-in keyboard, Arrangement, Mix
(channels, FX routing, recording), Toolbox (tile gestures, Synth/Sampler/
SF2-XI editors, effects, presets) and Setup (projects, audio routing, themes,
input bindings). Also covers the four input methods incl. the new
hold-to-repeat, file formats, recording, and default keyboard/gamepad/MIDI
maps. 11 on-device screenshots under docs/screenshots/, linked from README.
Also refresh the README's stale "NES synth" wording to "3-oscillator synth"
(renamed in v0.5.0).
Docs only — no code change, so no version bump or rebuild.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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