feat(sound): per-app volume on the drawer page, output to 150%

The island spec put per-app volume on the drawer page, and it was never
built. Each application playing audio now gets a row with its name, what it
is playing (two browser tabs are otherwise identical rows), a click-to-mute
level and its own slider.

Streams are matched on PwNodeType.AudioOutStream. Quickshell reports isSink
true for a playback stream, so the obvious isStream && !isSink filter found
nothing while Firefox played. Their properties are empty until bound, so the
page carries a PwObjectTracker for them, which stops with the drawer.
speech-dispatcher-dummy is always present and never audible, and is hidden.

The output slider runs to 150%, the ceiling the volume keybind already uses
(wpctl -l 1.5), with a tick at 100%. Input and apps stop at 100%: a boosted
microphone only clips. The meter became an inline component shared by both,
and wheel-up never lowers a level already past its maximum.

Now playing is dropped from the page: the OSD already carries it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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