• in linux with xfce and dark background, the icon is barely visible
  
• the GUI should have an option to close and only appear notification icon
  

Currently TravisCi tests are failing because the config isn't best (outdated), I believe reworking the test pipeline to GHA would benefit the project.

A good example may be https://github.com/Kyslik/column-sortable/tree/master/.github/workflows not sure if its copy-paste kind of thing.