fix(android/player): auto-skip a failed track on load error, not just zero-duration

onPlayerError fired a `load_failed` event and the snackbar reporter coalesced
it into "Skipped N unplayable tracks" — but nothing actually skipped, so a
bad/stale track stranded playback while the toast claimed otherwise. Mirror
the zero_duration path: advance to the next item and re-prepare (a load error
leaves the player IDLE), or stop at the end. Forward-only bounds a fully-
unplayable queue. Web parity with 2a8de82a. Issue #968.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

android/app/src/main/java/com/fabledsword/minstrel/player/PlayerController.kt

@@ -417,6 +417,16 @@ class PlayerController @Inject constructor(
                             detail = error.message,
                         ),
                     )
+                    // A failed load leaves the player IDLE; advance past the bad
+                    // track and re-prepare so one unplayable item doesn't strand
+                    // playback (mirrors the zero_duration skip). Forward-only —
+                    // stop at the end — bounds a fully-unplayable queue.
+                    if (controller.hasNextMediaItem()) {
+                        controller.seekToNextMediaItem()
+                        controller.prepare()
+                    } else {
+                        controller.stop()
+                    }
                 }
 
                 override fun onMediaItemTransition(