Support Material 3+You.

[RokeJulianLockhart]

Is your feature request related to a problem? Please describe.

This application's GUI is significantly different to most on an AOSP 14 installation, especially in how it doesn't adhere to any of the OS-wide colour and style customisations.

Describe the solution you'd like

Utilize GUI components that adhere to the "Material You" (OS-defined) colour scheme, and which are styled in the Material 3 style.

Describe alternatives you've considered

Not modifying the application and remaining on what I presume is an old API level, considering the apparent age of the components in use.

Additional context

1. This would replace "Select Colour Scheme" doesn't prefill either option after installation. #719 (comment) if implemented.

2. A more specific request than Improve UI across the app #73 (comment), which doesn't have a defined achievement state.