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fix(Layout): put the breakpoint tokens in the root layer (#823)

`--cui-breakpoint-*` and `--cui-mobile-breakpoint` are an export for whoever
reads the scale at runtime, not a layout rule, yet they were the only `:root`
tokens in the library emitted from `@layer layout` instead of `@layer root`.

They stay in `layout/` rather than moving to `_root.scss`, because
`coreui-grid.scss` ships layout without root and would have lost them — the
alternative is upstream's, a second copy in the grid bundle to keep in sync.
A partial of their own, forwarded ahead of the layout partials, means the root
layer also registers before the layout one in that bundle: `coreui-grid.css`
declares no layer order, so registration order is the order, and emitting the
block from `_grid.scss` put `root` after the containers' `layout`. It now
reads root, layout, utilities.

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