fix(playback): force a transcode when the webview cannot decode the audio (DR-149, 0.4.8)

Advertising a webview-shaped profile (DR-148) was necessary but not
sufficient. Probing the server directly showed Jellyfin 10.11.5 enforces a
DirectPlayProfile's Container and VideoCodec — excluding either returns
SupportsDirectPlay:false with TranscodeReasons=ContainerNotSupported /
VideoCodecNotSupported — but ignores its AudioCodec entirely: an E-AC-3
track is still offered for direct play against a profile listing only
aac,flac,mp3,opus,vorbis. Neither a VideoAudio CodecProfile forbidding the
codec nor MaxAudioChannels:2 against a 6-channel track changes the answer,
so no profile the client can send fixes this and the picture plays silent.

The client therefore stops delegating a question it can answer itself. The
negotiated source's audio is checked against what the webview decodes, and
an undecodable track forces the existing h264/aac HLS transcode regardless
of the server calling direct play fine; direct_play and needs_transcoding
are corrected to match so the frontend and the reporting path agree with
the URL actually used. The track judged is the one that would be served —
the default, else the first — since a supported track further down is not
the one that plays. A source with no audio, or a codec the server did not
name, is left alone rather than transcoded on a guess.

Test-first: the new tests failed against the old behaviour before the
decision existed. Verified on a motorola edge 30 by the audio HAL, not by
ear — the same E-AC-3 episode logged isMusicActive=true once and 58
ACDB-LOADER lines under this build, against 0 and 0 on 0.4.6, where an AAC
file in the same session produced 16 and 116. No FATAL EXCEPTION, so R8 on
the signed release build is unaffected.

Also carries in-flight subtitle-track work authored in a parallel session
(subtitleTracks, VideoPlayer, player/media, bindings) at the user's
request, so the tag matches the APK verified on device.

package.json

@@ -1,6 +1,6 @@
 {
   "name": "jellytau",
-  "version": "0.4.7",
+  "version": "0.4.8",
   "description": "",
   "type": "module",
   "packageManager": "bun@1.3.5",