Primary Button Has No Hover-State

[tbsbdr]

Steps to reproduce

1. Hover over "New" Button
2. Button Has No Hover-State

Expected behaviour

• Primary button should have a hover state
  Light mode:
• Darken on hover: decrease lightness of colors by 5% in HSL model
  (eg. hsl(213.06deg 52.69% 36.47%) minus 5% lightness→ hsl(213.06deg 52.69% 31.47%))
  Dark mode:
• Lighten on hover: increase lightness of colors by 10% in HSL model
  (eg. hsl(213.06deg 52.69% 36.47%) plus 10% lightness→ (213.06deg 52.69% 46.47%))

screenshot_001350-converted.mp4

screenshot_001351.mp4

Actual behaviour

• Button Has No Hover-State

[tbsbdr]

Example how I darkened the gradient:
https://github.com/owncloud/web/assets/26610733/90bb14ff-f8c1-4b8d-8801-6eba0efb3769

[JammingBen]

Fixed via #9394.