Correct the POST_NOTIFICATIONS mechanism: the lockscreen notification is exempt
because of the MediaSession token, not because it belongs to a foreground
service — FGS notifications are explicitly NOT exempt. So no permission prompt
and no checkSelfPermission gate; instead both notification builders bind the
token once and log loudly if it is ever null, turning a silent failure into a
logcat line. Stop the webview undoing the network security config:
mixedContentMode COMPATIBILITY, allowFileAccess/allowContentAccess false.
Conflict resolution: this branch's DR-198 collided with the Tauri branch's, so
it was renumbered DR-200 (3 TRACES in JellyTauPlaybackService.kt and the UR-006
matrix row updated). DR-199 was uncontested. Pinned counts summed to DR 191 /
total 334; UR-071 takes both DR-198 and DR-199.