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>

tools/build.sh

@@ -143,12 +143,14 @@ stage() {
   cp -R "$ROOT/frontend/." "$STAGE_APP/"
   # The mock only exists so the UI can be opened in a desktop browser.
   rm -f "$STAGE_APP/js/mock.js"
-  python3 - "$STAGE_APP/index.html" <<'EOF'
-import re, sys
-path = sys.argv[1]
-html = open(path).read()
+  python3 - "$STAGE_APP/index.html" "$ROOT/frontend/appinfo.json" <<'EOF'
+import json, re, sys
+html_path, appinfo_path = sys.argv[1], sys.argv[2]
+html = open(html_path).read()
 html = re.sub(r'\s*<script src="js/mock\.js"></script>', '', html)
-open(path, "w").write(html)
+version = json.load(open(appinfo_path))["version"]
+html = html.replace("__APP_VERSION__", version)
+open(html_path, "w").write(html)
 EOF
 
   cp "$ROOT/servicefiles/services.json" "$STAGE_SERVICE/"