[UI and look] Fix visuals: colors and icons

[Cyber2525]

Icons:

You're using Material symbols outlined But Material symbols Rounded are visually more appealing. This is from the official Google fonts website

Old ones

New ones

Colors: when selecting custom color of material you, you need to fix that the colors are too dark, and also I suggest adding this screen to color customitzation

Too dark colors screenshots, in the images I only show blue and yellow but this is affecting all the colors. You need to readjust the colors and themes, they're so ugly :