Map audio preview needs some improvements

[Xinnoh]

https://osu.ppy.sh/beatmapsets/572387/#osu/1255280 vs https://osu.ppy.sh/beatmapsets/333426#fruits/737862

https://osu.ppy.sh/beatmapsets/694107/#fruits/1468584 vs https://osu.ppy.sh/beatmapsets/458825/#fruits/983060

The first links are late, the second links are at the correct time. They all have the same preview points in game. Probably a client-side issue

Was a thing on the old site too

Summary:

• broken preview (#10331, #11041)
• low quality (#6459)
• timing (this, #10775)