reduce nested code

scripts/AudioManager.gd

@@ -7,23 +7,32 @@ var is_music_playing := false
 
 func _ready():
 	add_child(music_player)
-	var stream: AudioStream = load(MUSIC_PATH)
-	if not stream:
+	if not _load_and_configure_stream():
 		push_error("Failed to load music stream: %s" % MUSIC_PATH)
 		return
 
+	_configure_audio_bus()
+
+	if SettingsManager.get_setting("music_volume") > 0:
+		_start_music()
+
+func _load_and_configure_stream() -> bool:
+	var stream: AudioStream = load(MUSIC_PATH)
+	if not stream:
+		return false
+
 	if stream is AudioStreamWAV:
 		stream.loop_mode = AudioStreamWAV.LOOP_FORWARD
 	elif stream is AudioStreamOggVorbis:
 		stream.loop = true
 
 	music_player.stream = stream
+	return true
+
+func _configure_audio_bus() -> void:
 	music_player.bus = "Music"
 	music_player.volume_db = linear_to_db(SettingsManager.get_setting("music_volume"))
 
-	if SettingsManager.get_setting("music_volume") > 0:
-		_start_music()
-
 func update_music_volume(volume: float) -> void:
 	var volume_db = linear_to_db(volume)
 	music_player.volume_db = volume_db