feat: sync Playlists, wip: pair songs

app/src/main/java/at/lockstep/player/FolderPairingResult.kt

@@ -0,0 +1,14 @@
+package at.lockstep.player
+
+/**
+ * Outcome of bulk folder pairing: counts for UI toasts and debugging.
+ *
+ * [failed] includes rows with no local file match, validation errors, and rows with no Spotify track id.
+ */
+data class FolderPairingResult(
+    val paired: Int,
+    val failed: Int,
+    val jukeboxRowCount: Int,
+    val mp3Count: Int,
+    val skippedNoSpotifyTrackId: Int,
+)