music: add last modified to song

app/src/main/java/org/oxycblt/auxio/music/Music.kt

@@ -284,6 +284,7 @@ interface Song : Music {
     val durationMs: Long
     /** The ReplayGain adjustment to apply during playback. */
     val replayGainAdjustment: ReplayGainAdjustment
+    val lastModified: Long
     /** The date the audio file was added to the device, as a unix epoch timestamp. */
     val dateAdded: Long
     /**

app/src/main/java/org/oxycblt/auxio/music/stack/interpret/model/DeviceMusicImpl.kt

@@ -55,6 +55,7 @@ class SongImpl(linkedSong: LinkedSong) : Song {
     override val size = preSong.size
     override val durationMs = preSong.durationMs
     override val replayGainAdjustment = preSong.replayGainAdjustment
+    override val lastModified = preSong.lastModified
     override val dateAdded = preSong.dateAdded
     override val album = linkedSong.album.resolve(this)
     override val artists = linkedSong.artists.resolve(this)

app/src/main/java/org/oxycblt/auxio/music/stack/interpret/prepare/PreMusic.kt

@@ -47,6 +47,7 @@ data class PreSong(
     val size: Long,
     val durationMs: Long,
     val replayGainAdjustment: ReplayGainAdjustment,
+    val lastModified: Long,
     val dateAdded: Long,
     val preAlbum: PreAlbum,
     val preArtists: List<PreArtist>,

app/src/main/java/org/oxycblt/auxio/music/stack/interpret/prepare/Preparer.kt

@@ -81,6 +81,7 @@ class PreparerImpl @Inject constructor() : Preparer {
                         audioFile.replayGainTrackAdjustment,
                         audioFile.replayGainAlbumAdjustment,
                     ),
+                lastModified = audioFile.deviceFile.lastModified,
                 // TODO: Figure out what to do with date added
                 dateAdded = audioFile.deviceFile.lastModified,
                 preAlbum = preAlbum,