Move the per-generation progress + ended-detection task (~205 LOC)
out of audio/commands.rs into audio/progress_task.rs. The task is now
a sibling submodule that both audio_play (commands.rs) and
audio_play_radio (radio_commands.rs) import as
`super::progress_task::spawn_progress_task`, replacing the previous
`super::commands::spawn_progress_task` cross-import that radio was
using as a workaround.
audio/commands.rs: 1185 → 977 LOC. Cleanup: dropped now-unused
AtomicU32 and AudioCurrent imports from commands.rs.
What's left in commands.rs is now just audio_play (~760 LOC) and
audio_chain_preload (~195 LOC) — the playback orchestrator proper.
Splitting those further is a bigger structural job than file moves.
Pull audio_play_radio (~165 LOC) out of audio/commands.rs into
audio/radio_commands.rs. Live-radio playback differs from main track
playback: no gapless chain, no seek, no replay-gain, no preload —
collecting it on its own makes both modules easier to reason about.
The shared spawn_progress_task helper (still used by audio_play /
audio_chain_preload / audio_resume in commands.rs and now by radio)
moves from private to `pub(super)` so radio_commands can call it.
A follow-up could lift it into helpers.rs proper.
audio/commands.rs: 1614 → 1447 LOC. lib.rs invoke_handler updated.
Cleanup: dropped now-unused imports (`super::sources::*`,
`RadioLiveState`, `RadioSharedFlags`) from commands.rs.
Psychotoxical