feat(ui): dark mode (#850)

Description

it's the same, but dark.

theming (ui):

added palettes directory and created dark/light theme files
standardized colours
added better types for theme objects
ensured that we're using theme.palette.x in styling where there is or would be a switch (majority of the file changes 😅)
updated components and sections where necessary to work with theming changes from design QA, e.g.:
- removed the background cloud image from the Soon setup screen
- adjusted the LinearProgress component styling
tower animation:
- new build with added Dark Mode colour scheme
- added setAnimationProperties function for the toggle

theming (logic):

added theme and set_theme to app_config (system, dark, and light)
added UI store theme field, so we get the saved theme setting from app_config and use dark/light based on save settings or system
added useDetectMode helper hook to listen for (system) theme changes

other necessary updates:

added very_e(xperimental) flag to app_config and Very Experimental settings section
cleaned up our Button components:
changed ButtonBase which had the new styling for buttons (rounded) to Button as our default button
split out the old Button to SquaredButton, IconButton, and TextButton instead of having 600 props for variants
- updated styling options for button colours
added new RadioButton component
cleaned up Settings Navigation and added show/hide of super experimental settings