Draft: Updates and fixes to the stylesheet

Closed Sam Hewitt requested to merge snwh/phosh:wip/snwh/stylesheet-updates into main

The major changes in this MR are:

  • to the style of the panel
  • to the style of notifications overall
  • some synchronization with upstream styles
  • some gtk overrides to make things appear less like app UI, namely sliders
  • to the app grid buttons and overview

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