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fix(Utilities, IconLink): revive two rules that resolved to nothing (#835)

`.text-disabled` set `--cui-text: var(--cui-disabled)`, and `--cui-disabled` is
declared nowhere in v6 — v5 had it in `_root.scss`, marked deprecated, and the
root cleanup dropped the token while the class stayed. An undeclared `var()`
with no fallback is invalid at computed-value time, so the whole colour
declaration fell away and the text rendered at the body colour. Measured:
`rgba(37, 43, 54, .95)` before, identical to unstyled text; now
`color(srgb .145 .168 .212 / .38)`, the same as `.text-body-tertiary`, which is
v6's token for the least prominent text and carries v5's `.38` alpha.

`.icon-link` styled `> .bi` only — Bootstrap Icons' class. Our own set uses
`.icon`, which is what all six examples on the helper's page use, so
`.icon-link-hover` never animated an icon written the way we document it.
Measured on hover: `transform: none` before, a translation after. The size half
was already covered, because our `.icon` component sizes itself — the animation
was the part that was dead. `.bi` stays, so markup written against upstream
keeps working.

Raise the `coreui-utilities.min.css` budget from 14.5 to 14.75 kB: the fix puts
it at 14.51 kB, since `--cui-tertiary-color` is six characters longer than the
name it replaces.

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