test(popover): phase 6 tests for behavior, utils, and a11y

[rubencarvalho]

Description

Phase 6 (testing) for the Popover migration: play functions for synthetic-input behavior, Playwright tests for native browser dismissal, and unit tests for the shared core/utils.

What's in it

• Play functions (popover.test.ts): synthetic-input behavior. Property defaults and reflection, ARIA (aria-expanded, aria-haspopup="dialog", aria-controls), click-to-toggle, programmatic close-source, modal scroll-lock and backdrop, focus restoration, and failed showPopover()/showModal() handling.
• Playwright a11y spec (popover.a11y.spec.ts): ARIA-tree snapshots, plus native light-dismiss (which needs trusted input): Escape and outside-click close-source, modal Escape, and a 3-level nested dismissal-ordering test. Native dismissal cannot run in a play function (see docs(testing): test native dismissal in the Playwright spec, not play functions #6474), so it lives here.
• Unit tests: resolve-trigger, dismissible-stack, transition, deep-contains.

Notes

Base is ruben/popover-migration (now on main, spectrum-tokens 14.13.1). #6357 (Phase 4+5) is merged, so this diff is the Phase 6 delta only.

Related issue(s)

• Epic SWC-1993

Accessibility testing checklist

• Keyboard: Playwright drives trusted Escape and outside-click, asserting close-source and 3-level nested dismissal ordering; aria-expanded toggling is covered by play functions.
• Screen reader: ARIA-tree snapshots assert the trigger's collapsed dialog control and the open dialog's accessible name (default and modal modes).

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