- Stop in-progress ATC speech (HTTP request + audio playback) when the
active frequency changes via preset select or swap button. Prevents the
pilot "hearing" a controller on a frequency they have already left.
- Fix RangeError crash for long PTT recordings: btoa(String.fromCharCode
(...largeArray)) overflows the call stack above ~2 s of audio and
silently drops the PTT request. Replaced with chunked 8 KB conversion.
- Add 30 s PTT auto-stop timer so runaway holds are submitted rather than
silently lost.
- Add AbortSignal support to useApi so fetch requests can be cancelled.
