twbs / bootstrap / 28335809802

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Add a skill for v5 for v6 migration (#42349)

* wip

* Skill: correct v5→v6 migration guide and add new-component coverage

- Close button: keep the empty .btn-close (CSS-mask icon over currentcolor);
  drop the wrong 'add a child SVG' instruction that double-rendered the icon,
  and note .btn-close-white is gone (set text color instead)
- Border radius: remove the fabricated $border-radius-2xl rename; document the
  real $radius base + $radii map (0-9) + --radius-* tokens
- Font sizes: note lg+ are fluid clamp() values (not exact rems) and list the
  full xs-6xl scale
- Add a 'Rebuilt behavior & new components' section: carousel→scroll-snap with
  opt-in autoplay, scrollspy→IntersectionObserver, the new components
  (combobox, chips, datepicker, range, strength, otp-input, nav-overflow,
  toggler), util/backdrop.js removal, CSS @layer, and --bs-*-rgb removal
- Extend the Phase 6 grep checklist for all of the above

* Skill: align migration guide with migration.mdx changelog

- Remove the 'ScrollSpy → IntersectionObserver' note: v5 (5.2+) already used
  IntersectionObserver, so it's not a v5→v6 change (the docs changelog omits it)
- Expand carousel coverage to match the changelog: ride→autoplay, wrap→ends,
  removed control/caption/dark/stacked classes, .carousel-overlay requirement,
  control-icon renames
- Add the remaining new components (submenu, stepper, avatar, form-adorn, prose)
- Note the .rounded-* remap + --radius-pill, and link-*→underline-* utilities
- Extend the Phase 6 grep list accordingly

* Docs: fix self-contradictory border-radius migration note

The Sass deprecation list said to use `$border-radius-2xl`, but the
Utilities section (and the source) removed the whole `$border-radius-*`
family in favor of the `$radii` map / `--radius-*` tokens. Point the
note there instead.

* Docs: note removal of focustrap and scrollbar utilities

#42595 removed util/focustrap.js and util/scrollbar.js (dead code after
the native <dialog> Dialog/Drawe... (continued)

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