fix(module): avoid unhead v2-only hookOnce in colors plugin

[IgorShevchik]

Upstream

e4ca579 — fix(module): avoid unhead v2-only hookOnce in colors plugin (#6658)

Arrived upstream during the #227–#233 sync batch — the first commit past the previous v4 HEAD (a84de85), now the new v4 HEAD.

Change — direct 1:1

In src/runtime/plugins/colors.ts, the SPA-hydration branch removed its temporary colors <style> via injectHead().hooks.hookOnce('dom:rendered', …). hookOnce only exists on unhead v2's Hookable; under unhead v3, hooks is a HookableCore exposing only hook. Replaced with a self-unhooking hook:

const head = injectHead()
const unhook = head.hooks?.hook('dom:rendered', () => {
  removeTemporaryColorsStyle()
  unhook?.()
})

b24ui had the identical pre-change line; applied verbatim (the data-bitrix24-ui-colors attribute and surrounding logic are untouched).

Tests

Client-only SPA-hydration plugin path; no component/markup change → no snapshot churn. Full suite unchanged (225 files, 5145 passed / 6 skipped).

Verify (CI=true)

dev:prepare · lint · typecheck · test · build — all green.

Ledger

• .sync/log/e4ca579….md — port rationale
• .sync/nuxt-ui.json — add e4ca579 as port, advance cursor (= new upstream v4 HEAD); reconcile prior a84de85 → PR feat(ScrollArea): add getScrollElement virtualize option #233 / 63fe722c. (e4ca579 itself stays pending-merge, reconciled next port.)

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