feat(sound): switch default device, control the level

The sound page showed the default sink and source but gave no way to
choose another device and the meter was inert. Each section now lists
the real audio devices, streams and monitor nodes filtered out, behind
an in-place dropdown that sets Pipewire.preferredDefaultAudioSink or
preferredDefaultAudioSource. The meter takes the wheel, click and drag,
and the state glyph beside the percentage toggles mute.

The list expands in place rather than in a popup because a
QtQuick.Controls popup is a separate window and does not position
reliably on a layer surface. The meter accepts the wheel and prevents
stealing so the page's ScrollView neither scrolls nor flicks instead.

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