enh(ui): new theme for sight_viewer
Description
Use the new ircad theme in sight_viewer app.
Functional specifications
- Apply the QSS ircad_theme on sight_viewer
- Do some update on the QSS if needed
- Change layout to best fit the new theme
Technical specifications
- Find a way to remove hardcoded background color in the XML (by using QSS class for instance ?)
- Move dedicated actions directly in overlay in the scene where it applies
- Change icons if necessary (can be done later when all icons will be available).
- Update gui test of sight_viewer if needed
Test plan
Run sight_viewer Run gui tests