Drop the brightness control, survive and explain a frozen mic

- Remove RGB brightness: firmware 2.1.2 stores the value but the LEDs
  never change, so the control did nothing. PROTOCOL.md notes why.
- Lock the device per transaction (flock) so the CLI and the web
  service can't interleave and steal each other's replies.
- Detect a mic that is plugged in but no longer answering and tell the
  user to replug it (a USB reset is not enough; settings survive).
  Seen when hardware buttons are held while settings are being written.
- Web page keeps the last known value when a poll comes back partial,
  instead of drawing unanswered settings as off.
- New screenshot.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
2026-10-08 10:45:18 -05:00
co-authored by Claude Opus 5.5
parent 66d159b0d2
commit 1fcf73ed9d
7 changed files with 50 additions and 15 deletions
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