Address Copilot AI review: SongPreview playback, WebSocket UTF-8/boun… #1599

Job	Run time
Code Quality	2m 35s
Test (Linux, ubuntu-latest, SingleThread)	2m 12s
Test (Windows, windows-latest, SingleThread)	3m 56s
Test (Windows, windows-latest, MultiThreaded)	4m 11s
Build only (Android)	12m 52s
Test (Linux, ubuntu-latest, MultiThreaded)	2m 10s
Build only (iOS)	3m 52s
Test results	11s
	31m 59s

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