Add two codeplug primitives - codeplugAllChannelsIndexSetUnused() (frees a
channel slot: clears the in-use bitmap bit, persists the header, fixes counts)
and codeplugZoneRemoveChannelFromZoneAndSave() (removes a channel from a zone's
list) - and wire two new Channel quick-menu items:
- 'new channel': allocates the first free slot, writes a blank 145.500 FM
channel, adds it to the current zone, reloads the zone and opens Channel
Details to edit it.
- 'Delete Channel': confirmation, then scrubs the channel from every real zone
before freeing the slot. Guards against deleting the last channel and honours
the read-only/APRS lock.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Add a one-tap audio mute on the VFO and Channel screens:
- SK2 short-tap toggles mute via the built-in audioAmpMute()/audioAmpIsMuted().
The tap is only consumed by the existing "set TX TG to incoming" behaviour
while a DMR QSO is on screen, so mute works everywhere else.
- Header: a bold "M" is shown just left of the battery while muted (the
firmware's built-in strike-through over the mode text also still shows).
- LED: flashes red for 0.5s every 2s while muted (main loop), overriding the
normal RX/TX LED.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
