- Apply consistent blue theming, including setting to switch between dark/light modes
- Hide edit button and all checkboxes in front of continents
- Use material design for clickable buttons and checkboxes
- Show percentages of visited countries per continent (possibly enable/disable in settings?)
The idea is to make it as practical as possible for the user:
- I would use the long click for something else, maybe a small menu about the continent/country
- The edit button at the top should enable/disable the checkboxes (but it should be aligned on the right)
- Issue: When enabling a country, then the whole continent it belongs to, and then disabling the continent again, there is no undetermined state anymore, the box is unchecked
