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Add layered shadows, shadow theme variant utilities, `shadow-xs`, and keyline border width. (#42675)

* Add keyline (.5px) border width

* Add layered shadow system with color, opacity, and strength tokens

* Docs: document shadow color, opacity, and the new .shadow-xl size

* Docs: add keyline example to border width utilities

* Docs: use keyline borders on header menus and search input

* Add --box-shadow-xs token and .shadow-xs utility

Introduce a smaller box shadow between the existing default and sm sizes,
and expose it through the shadow utilities.

* cspell

* Scope shadow color and opacity to non-inheriting local vars

Shadow color and opacity utilities now compose through local --sc/--so
variables (like --bc for border-color) instead of setting --shadow-color
and --shadow-opacity directly, so .shadow-{color} and .shadow-opacity-*
no longer leak into nested .shadow-* descendants. The $shadows map
(scss/_config.scss) reads var(--sc, var(--shadow-color)) and
var(--so, 1), keeping --shadow-color/--shadow-strength as the
cascading global defaults. Removes the now-unused at-property utility
key since no utility needs the cascading opt-out anymore.

Updates the shadows docs with a nested-elements example and callout,
and adds a migration guide entry.

* format

* fix

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