add closed shadow dom test

[audreyality]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-35399

📔 Objective

Introduce a test that autofills inputs in closed shadow DOMs.

This test only runs the first Autofill scenario because the field within the shadow root cannot be focused by Playwright.

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR adds a new test scenario for autofill into inputs inside closed shadow DOMs at /forms/login/shadow-root-inputs-closed, introducing a verifyAccessor: "value" | "text" field on FillProperties so the spec can read filled values from non-input mirror elements via toHaveText. The autofill spec correctly waits for attached rather than visible for text-mode mirrors (which have no rendered size until populated), and the page entry skips the three test scenarios (InlineMenuAutofill, NewCredentialsNotification, PasswordUpdateNotification) that require focusing the input — a documented Playwright limitation for closed shadow roots. The trailing-slash fix on the existing shadow-root-inputs/ cipher URL is a nice catch — without it, the new shadow-root-inputs-closed page would also match that cipher under UriMatchType.StartsWith.

Code Review Details

No issues found. The change is well-scoped, internally consistent (testPages and pageCiphers stay 1:1), and the JSDoc on verifyAccessor plus the inline comments at the trailing-slash fix and the wait-state branch make the reasoning self-evident.

[jprusik]

Playwright can still use navigational keyboard controls (Tab, Space, Enter) in order to navigate into an inline menu and execute a presumed selection (followed by a form submit via Enter). I have a PoC kicking around somewhere, I'll see if I can find it...

[audreyality]

The issue here isn't navigating the overlay. It's navigating into the username/password boxes in the first place. Keyboard controls can still work for that; what I wonder about is whether it's too brittle for the test case, since it depends on the tab order of the page's controls.