[Bug]: black semi-transparent header in fullscreen mode

[AnthonyLenglet]

Is there an existing issue for this?

• I have searched the existing issues

Bug Description

when setting the app in fullscreen, a semi-transparent header shows up

Expected Behavior

this header show not exist, to be more in line with what you would see in the apple music UI

Steps to Reproduce

1. go in fullscreen mode

macOS Version

macOS 26 (Tahoe)

Kaset Version

0.13.0

Affected Area

UI / Visual

Screenshots or Logs

Apple Music for comparison:

Additional Context

No response