fix(ui): mini-player attributes track to its station

Radio subtitle is now 'artist · Station' so a track name never looks
like it contradicts the station shown in the list/hub.

app/src/main/java/com/rada/ui/player/NowPlayingBar.kt

@@ -72,9 +72,17 @@ fun NowPlayingBar(
         subtitle = localMedia?.second.orEmpty()
     } else {
         val meta = streamMeta
-        title = meta?.displayTitle?.takeIf { it.isNotEmpty() } ?: stationName
-        subtitle = if (meta != null && meta.displayTitle.isNotEmpty())
-            meta.displayArtist.ifEmpty { stationName } else ""
+        val track = meta?.displayTitle?.takeIf { it.isNotEmpty() }
+        if (track != null) {
+            // Radio playing a tagged track: track on top, "artist · Station"
+            // below so the track is always attributable to its station.
+            title = track
+            val artist = meta?.displayArtist.orEmpty()
+            subtitle = if (artist.isNotEmpty()) "$artist · $stationName" else stationName
+        } else {
+            title = stationName
+            subtitle = ""
+        }
     }
 
     AnimatedVisibility(