feat(radio): PLS/M3U playlist resolution + ICY metadata for playlist streams

Resolves PLS and M3U/M3U8 playlist URLs to their first direct stream URL
before playback and ICY metadata fetching. Stations configured with a
.pls or .m3u URL (e.g. SomaFM, schizoid.in) now play correctly and
report track metadata via ICY headers.

- Rust: parse_pls_stream_url / parse_m3u_stream_url helpers
- Rust: resolve_playlist_url (shared) + resolve_stream_url Tauri command
- fetch_icy_metadata: auto-resolves playlist URLs before connecting
- playerStore: playRadio() awaits resolve_stream_url before setting audio src

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/PlayerBar.tsx

@@ -86,6 +86,7 @@ export default function PlayerBar() {
   // Radio metadata (ICY or AzuraCast) — only active while a radio station is playing.
   const radioMeta = useRadioMetadata(currentRadio ?? null);
 
+
   const isStarred = currentTrack
     ? (currentTrack.id in starredOverrides ? starredOverrides[currentTrack.id] : !!currentTrack.starred)
     : false;