refactor: column settings / color picker

[Schwehn42]

Description

This PR refactors and improves on some issues with the current ColumnSettings and ColorPicker components, in order to make it usable within other components.

Separation of concerns

Previously, ColorPicker would dispatch the function to change the column color itself.
Since in other implementations, other things should happen upon selection, this has been moved to the parent component; a function with the selected color is propagated.

Unified rendering

Since the ColorPicker had no state whether it was open or closed, the closed version would be rendered in the parent component.
This lead to CSS classes being mixed.
Now, also the closed color picker is rendered within the color picker itself, so no CSS has to be imported by the parent component

Other changes

While we're at it, some other changes were made in an attempt to improve readability.

Changelog

• Separate logic to select a color in the parent component; a function with the selected color is propagated by ColorPicker.
• Closed ColorPicker is now also rendered within the component itself
  • open state is passed to it for this
• Rename CSS classes to match ColorPicker
• Simplify props for ColorPicker and ColumnSettings
  • pass column as Column type instead of separate property
  • Remove duplicate close functions which had the same purpose
• Remove unneeded optional chaining and nullish coalescing
• Cleanup imports
• Rename MiniMenu prop icon to element to generalize purpose

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

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[laila-rin]

lgtm, thanks! :)