torlando-tech f73fbb2568 Fix LXST voice call interop with Python LXST/Columba ...

- Fix thread safety: defer Reticulum link callbacks (packet, link_closed)
  to call_update() which runs under LVGL lock, preventing crashes from
  concurrent LVGL access across cores
- Fix outgoing call signal handling: store link reference and re-register
  packet/link_closed callbacks in on_call_link_established so signals
  are actually received
- Fix call answer screen freeze: update UI before blocking audio init
  (I2S/ES7210/Codec2 setup) so screen renders immediately
- Fix audio direction: use startPlayback() (speaker RX) instead of
  startCapture() (mic TX) so received audio is actually heard
- Add msgpack wire format for LXST signalling and audio frames
- Add LXST IN destination for receiving calls + announce support
- Add incoming call UI (Answer/Reject buttons) on CallScreen
- Add path request before outgoing call link establishment
- Add LXST announce handler registration

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-19 21:00:07 -05:00

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