Tolerate space-padded pactl output, and show the running app version

The device-source parser assumed pactl list short sources is strictly
tab-separated, true for stock PulseAudio but not guaranteed for a
TV's own heavily customized audio stack (this one names sources
tpcm_output/tpmedia/tptts/... — clearly not vanilla). A different
separator would have silently produced zero parsed sources with no
error, and the picker's own `when` guard would then just hide the row
entirely rather than show anything broken. Split on any whitespace
run instead of a literal tab; source names never contain embedded
whitespace, so this is strictly more permissive with no new failure
mode. Confirmed end to end on real hardware: tptts.monitor lit up
during the accessibility voice guide and reached HyperHDR.

Also: the System panel now shows the app's actual running version,
read from a <meta> tag substituted at package time (tools/build.sh
stage()) from frontend/appinfo.json — not hand-maintained, so it can't
drift from what was actually built. Requested after a version bump
alone wasn't enough to tell whether a reinstall had truly picked up
new files versus served something cached along the way; this settles
that question by inspection instead of by inference. Bumped to 1.0.2.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

test/ui_smoke.js

@@ -114,6 +114,13 @@ async function main() {
   check('mock bus in use', window.Luna.available === false);
   check('settings loaded', !!(window.App.state.settings.capture));
   eq('config path shown', $('config-path').textContent.indexOf('/var/lib/webosbrew') >= 0, true);
+  // This loads the raw source tree's index.html, not a packaged build, so
+  // the __APP_VERSION__ placeholder was never substituted — the fallback
+  // is the correct, honest thing to see here.
+  eq('unpackaged run shows the dev-build fallback, not a stale version',
+    window.App.state.appVersion, 'dev build');
+  check('app version shown in the System panel',
+    $('config-path').textContent.indexOf('dev build') >= 0);
 
   console.log('status feed');
   eq('starts stopped', $('state-pill').textContent, 'Stopped');