Fix and beautify minimap

## Description

The current minimap doesn't work on macOS. Ensure it works on all devices and make the minimap prettier by adding some colour to it.

Start by locating the minimap entry point and reproducing its failure on macOS, then compare it with another supported device. The work is done when the minimap functions across devices and its appearance includes the requested colour improvements; no file or test is named in the issue.

Written by the indexing model from the issue text.