v0.8.2

• The user guide is now published as a GitHub wiki page, mirrored from
  docs/user-guide.md on every push to main.

• The deck's nameplate and its two guide rollers now take a tint from
  Creator's own interface colour, so the fittings reflect the app around
  them: slate in the dark theme, bright chrome in the light one.

• The deck has one transport key, and it toggles. It reads Record at
  rest, and Stop while you record — press it again to end the recording.
  The separate Stop key on the deck is gone; the recording screen keeps its
  own Stop and Discard keys at the foot. A macro that plays is stopped from
  the row that plays it.

• The caption under the key names what the recorder watches — LAYER A,
  the scene's own name when nothing is selected — and no longer repeats the
  word RECORDS in front of it. The key is as wide as the nameplate above it.

• A macro recorded on one layer now needs a layer selected to play. With
  nothing selected the panel says so instead of restoring the recorded values
  onto the recorded layer, which right after recording changed nothing and
  said nothing. A scene rebuild that writes a value a layer already holds now
  says "already at this value — nothing changed".