Add minimal reproducers for known bugs

- Added `examples/reproducers/issue-001-video-card-logic/` to reproduce VideoCard logic failure.
- Added `examples/reproducers/issue-002-login-modal-nsec/` to reproduce Login Modal missing error.
- Added `examples/reproducers/issue-003-popover-ref-error/` to reproduce Popover ReferenceError.
- Each reproducer includes a README.md with instructions.

examples/reproducers/issue-003-popover-ref-error/README.md

@@ -0,0 +1,12 @@
+# Issue 003: Popover ReferenceError
+
+This reproducer attempts to reproduce the `ReferenceError` in popover placement tests.
+
+## Run
+```bash
+npx playwright test examples/reproducers/issue-003-popover-ref-error/repro.spec.ts
+```
+
+## Expected Result
+If the bug is present, the test will FAIL with `ReferenceError`.
+Note: In some environments, this test might pass if the bug is flaky or fixed.