Use Theme rather than Style file in UI

[ghusta]

Try to replace res/values/styles.xml by res/values/themes.xml

See :

• https://developer.android.com/develop/ui/views/theming/themes
• In Material Design 2 : https://m2.material.io/design/material-theming/overview.html#material-theming
• Blog : https://medium.com/androiddevelopers/android-styling-themes-vs-styles-ebe05f917578

[ghusta]

See also pb with popup menu :

• https://github.com/material-components/material-components-android/issues/751
• https://stackoverflow.com/questions/66972127/change-popup-menu-text-colors