Lower default music volume

src/lib/music/player.svelte.ts

@@ -9,7 +9,7 @@ class MusicPlayer {
 	elapsedSinceStart = $state(0);
 	paused = $state(true);
 	muted = $state(true);
-	volume = $state(0.6);
+	volume = $state(0.1);
 	unavailable = $state(false);
 	history = $state<number[]>([]);
 	repeat = $state(false);