Improve styling of components

The MicroGUI web app uses MaterialUI to style all components. Components are generated on the display with LVGL which has different styling. These do not necessarily have to be identical, but some properties like size, fonts and variant could definitely be implemented in the LVGL components, since these are available in MaterialUI.

Start by locating the LVGL component-generation code and compare its styling properties with the MaterialUI components described in the issue. Done means the relevant LVGL components support the agreed size, font, and variant properties while remaining usable on embedded displays.

Written by the indexing model from the issue text.