[Enhancement] enable "dark mode" display theme, and enable background solid colour instead of flashy vertical bars

[homeelab]

Hi,

Running v4 AllWinner with v1.4.0 code version

The flashy vertical bars are pretty aggressive to the eye, especially when no screen is yet displayed. Would it be possible to replace by a simple solid colour background ? primary colour like black is softer for reading.

Globally a dark mode theme would be appreciated also for the rest of the UI, including the left bar menu

Thanks