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Finish moving Sass variables to CSS custom property tokens (#42701)

* Consolidate font-weight variables into a $font-weights Sass map

Individual $font-weight-lighter/light/normal/medium/semibold/bold/bolder
variables made it easy to forget one when adding a new weight and kept
the values duplicated across _config.scss, _root.scss, and the
utilities API. Move them into a single $font-weights map so --font-weight-*
tokens and the fw-* utilities are generated from one source, matching
the pattern already used for $font-sizes.

* Replace line-height Sass variables with CSS custom properties

$line-height-base/sm/lg duplicated values already exposed as
--line-height-* tokens (generated from $font-sizes). Point the
line-height utilities and --body-line-height at the CSS variables
instead of the Sass variables so there's one source of truth and
runtime overrides of --line-height-* also affect the utility classes.

* Remove $headings-color Sass variable

It was the last Sass variable left in the heading/type system after
the rest moved to CSS custom properties, and it only ever had one
value (inherit). Hardcode --heading-color: inherit directly in
$root-tokens instead so headings customization is fully CSS-variable
driven, matching paragraphs, lists, and legend.

* Remove $link-decoration and $link-underline-offset Sass variables

Both had a single fixed value and existed only to be interpolated into
--link-decoration and --link-underline-offset once, in $root-tokens.
Hardcode the values there directly instead, simplify the list-group
item's text-decoration to plain `none` (it no longer needs to branch
on $link-decoration), and drop the stray commented-out
$enable-negative-margins default and leftover dead comments in Reboot.

* Config: remove orphaned Typography comment header, fix spacing

* Move transition variables into component tokens

$transition-fade and $transition-collapse/$transition-collapse-width
lived in _config.scss like other component token... (continued)

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