fix: Improve error message for missing song ID in GetById method

Author: Yushu2606

src/Prober/DivingFish/Models/Song.cs

@@ -65,7 +65,7 @@ private static Songs SharedSongs
 
     public static Song GetById(string id) => SharedSongs._songsById.TryGetValue(id, out Song? song)
         ? song
-        : throw new InvalidDataException();
+        : throw new InvalidDataException($"Song with ID {id} not found");
 
     public static explicit operator Songs(List<Song> songs) => new(songs);
 

src/Prober/Lxns/Models/Record.cs

@@ -45,7 +45,7 @@ public record Record : SimpleRecord
         SongData songData = SongData.Shared;
         if (!songData.SongsById.TryGetValue(Id, out Song? song))
         {
-            throw new InvalidDataException();
+            throw new InvalidDataException($"Song with ID {Id} not found");
         }
 
         return (Type switch