* fix(player): preserve volume when toggling mute
Muting now keeps the last volume level memorized. Unmuting restores that level, including amplified values allowed by the configured maximum.
* fix(player): preserve volume for companion remote mute
Route the companion remote through the shared mute transition so it no longer overwrites the persisted volume or restores to 100%. Also correct the Dartdoc formatting for the transition record fields.
edde746