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Fix Sass theme map configuration and merge overrides via defaults() (#42849)

* Fix Sass theme map configuration and merge overrides via defaults()

bootstrap.scss never forwarded the theme module, so configuring
`$theme-colors` through the entrypoint with `@use ... with (...)` failed
with a "not declared with !default" error. Forward the theme module to
expose the theme maps for configuration.

Also convert the theme maps to the defaults() pattern so overrides merge
on top of the built-ins instead of replacing the whole map, and let a
`null` value remove a key. The default build output is unchanged.

Add a regression test and update the Sass and Theme docs.

Fixes #42847

* Use var(--black) in theme config test to satisfy color-named lint

The stylelint color-named rule rejects named colors like `black` in
declaration values. Reference the token instead, which also matches how
real theme maps set values.

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