v0.6.0

Added

• Tap the mode you are already in to reach its alternate — the reverse or
  opposite sideband, paired as the radio pairs them: LSB ⇄ USB, CW ⇄ CW-R,
  DATA ⇄ DATA-R. Tapping again returns you. AM and FM have no alternate and are
  unaffected. Previously that tap re-sent the mode already in effect and did
  nothing. (FR-UI-ALT-01)
• The diagnostics console reports the worker loop's own rate every few
  seconds — filter it on perf. It reads like
  worker 340 loops/s, publish 20/s costing 12.4 ms/s, and it is there so a
  report of "the spectrum is lagging" can be answered with a measurement.

Changed

• Controls no longer resize as their content changes (FR-UI-STABLE-01).
  A control whose label varies over a known set now reserves the width of its
  widest possible label. The worst case was ARM TX, which grew to
  TX ARMED — DISARM on arming and shoved PTT and EMERGENCY STOP
  sideways — the two controls you least want moving under a cursor that may be
  reaching for them. Also fixed on the ATU buttons and the per-receiver volume
  and mute controls.

  Not yet a complete sweep: the connect button, the theme button, the filter
  shift/edge toggle, the APF widths and several numeric readouts still resize.

Fixed

• The radio's stream could fall behind, showing as a lagging spectrum and
  waterfall, especially with the diagnostics console open. The worker
  published a full snapshot — both waterfalls, the spectrum and the whole radio
  state, deep-copied — on every read from the socket, hundreds of times a
  second, while the display only samples it ten times a second. That work
  competed directly with draining the socket. Publishing is now capped at
  20 Hz.

  If you still see the stream fall behind, the new perf line is the thing to
  report — it says whether the worker is keeping up.

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Full history: CHANGELOG.md