Use different colors for grid-based global actions menu.

Refactor EmergencyActions to group coloring code.

Test: Automated tests pass, global actions menu colors match mocks for dark + light themes. Buttons and text are readable.
Change-Id: Ia0ca8c31d09cda8acda7b8677c2ccd923cc2c0c5

Fixes: 126445990
Fixes: 128768560