fix(android): close PlaybackErrorsApi kdoc — Kotlin nested-comment trap

The kdoc on PlaybackErrorReportRequest mentioned the existing
/api/plays/* endpoint. Kotlin's lexer treats /* inside a /** ... */
kdoc as a NESTED comment opener, which then swallows the outer
*/ — so the entire PlaybackErrorReportRequest data class
disappeared from the symbol table and the four call sites in
PlaybackErrorsApi.kt / MutationReplayer.kt / PlaybackErrorRepository.kt
all reported "Unresolved reference".

This is the trap recorded in the project's KSP-could-not-be-
resolved memory; mark it again. Fix is mechanical: rewrite the
prose as `/api/plays/...` so no /* sequence appears inside a
block comment.

android/app/src/main/java/com/fabledsword/minstrel/api/endpoints/PlaybackErrorsApi.kt

@@ -21,8 +21,8 @@ interface PlaybackErrorsApi {
  * "zero_duration" / "load_failed" / "stalled"; server validates against
  * the CHECK constraint enum. `detail` is optional free-text (Media3
  * error message, etc.). `clientId` reuses the existing playback
- * client identifier the device already sends with /api/plays/* so
- * support can correlate reports across surfaces.
+ * client identifier the device already sends with `/api/plays/...`
+ * so support can correlate reports across surfaces.
  */
 @kotlinx.serialization.Serializable
 data class PlaybackErrorReportRequest(