style(popups): silence no-duplicate-selectors on intentional re-open

[jason10lee]

All Submissions:

• Have you followed the Newspack Contributing guidelines?
• Does your code follow the WordPress coding standards and VIP Go coding standards?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Changes proposed in this Pull Request:

Annotates an intentional, documented duplicate selector in newspack-popups so it passes Stylelint's no-duplicate-selectors rule. Near the bottom of src/view/style.scss, the .newspack-lightbox / .newspack-popup__content-wrapper selectors are deliberately re-opened (with an explanatory comment) to keep the wide/full-block alignment rules together with their rationale. This wraps that block in a scoped /* stylelint-disable no-duplicate-selectors */ … /* stylelint-enable */.

Comment-only — no change to the compiled CSS.

This clears the last item in the repo-wide SCSS lint backlog, which is a prerequisite for the NPPM-290 Phase 2 CI SCSS gate (separate, follow-up PR).

Part of NPPM-290: Theme linting: PHP & CSS.

How to test the changes in this Pull Request:

1. On this branch, run pnpm --filter newspack-popups run lint:scss → it passes (0 problems).
2. On main, the same command reports 2 no-duplicate-selectors errors in src/view/style.scss.
3. Confirm the change is comment-only (no compiled-CSS impact): git diff main..HEAD -- plugins/newspack-popups/src/view/style.scss shows only added comment / stylelint-disable / stylelint-enable lines.

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?

[Copilot]

Pull request overview

This PR updates newspack-popups SCSS to explicitly annotate an intentional selector re-open so Stylelint’s no-duplicate-selectors rule doesn’t flag it, without changing the resulting compiled CSS.

Changes:

• Adds explanatory comments documenting why the .newspack-lightbox / .newspack-popup__content-wrapper selectors are intentionally re-opened.
• Wraps the deliberate duplicate-selector block in /* stylelint-disable no-duplicate-selectors */ and /* stylelint-enable no-duplicate-selectors */ to keep linting strict elsewhere.