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fixes #19148 as follow up to #19099: ensure local mixin variable is used for  in make-grid-columns mixin

(as opposed to maximums)

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Introduce $mark-bg variable so that <mark>'s background-color can be customized independently of $state-warning-bg

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fixes #18940: use specific border properties when changing the corners of list groups in cards to avoid overriding combo first-/last-child items

Alternate fix to #17965: Updates to use the new class name and adds some basic docs for custom checkbox/radio validation

Move to a translucent input border with background-clip: padding-box for improved blending across different background-colors

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- Moves from no set line-height (inherited of 1.5) to declared 1.25 for
all inputs and buttons (regardless of size modifier).

- Updates padding to be `.5rem` instead of `.375rem` so that padding is
more likely to be whole numbers based on the root font-size.

- Whole numbers will be beneficial in avoiding odd fractional pixels
that can lead to misalignment as shown in #18607.

- Large buttons and inputs are now a tad wider, and smaller
buttons/inputs a tad shorter and narrower, too.

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