[Feature]: Show thumbnail and set the background colors to match theme by default

[FixItKit]

Description

The thumbnail should be enabled and the background colors set to match theme by default. Changing these options make RiMusic's player interface look more like other music players so it's easier to switch for those who don't change (or change minimally) the settings of RiMusic.

Suggested Solution

Enable the thumbnail and make the background colors match the theme by default.

Alternatives

No response

Additional Context

No response