feat(recording): show sinks with active audio indicators in quick-setup

Quick-setup (C-; r s) is now a two-step flow: pick a mic, then pick an
audio output sink. Sinks display 󰕾/󰖁 icons with green/dim coloring to
indicate which have active audio streams, with active sinks sorted to
the top. The chosen sink's .monitor is set as the system audio device.

This replaces the old auto-default-sink approach, letting users see
where audio is actually going and pick the right sink in one command.

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