/**
 * Patches `toBeVisible()` to understand popover and dialog visibility.
 *
 * jest-dom's `toBeVisible()` does not know about the Popover API. In real
 * browsers the UA stylesheet hides `[popover]` with `display: none`, but
 * jsdom has no such stylesheet - so closed popovers incorrectly appear visible.
 *
 * Raw jest-dom results in jsdom:
 *
 *   closed popover / child  → true  (WRONG - should be false)
 *   open popover / child    → true  (correct)
 *   closed dialog / child   → false (correct - jsdom natively hides <dialog>)
 *   open dialog / child     → true  (correct)
 *
 * We correct both false positives and false negatives:
 *   1. Delegate to the original first.
 *   2. If it says "visible" → check for closed top-layer hosts (false positive).
 *   3. If it says "not visible" → check for open top-layer hosts (false negative).
 *
 * Must load via `setupFilesAfterEnv` (after jest-dom registers its matchers).
 * Polyfills live in `./polyfill` (loaded via `setupFiles`).
 */
export {};