fix: Focus lock uses correct direction when initial focus is outside the lock

[pan-kot]

Description

The focus lock is commonly used with auto-focus (via autoFocus prop or manual). Thus, the focus is always inside the lock, and the tab traps behaviour is correct: upon reaching the last tab trap - the focus must move to the 1st focusable element, and vice-versa.

However, this use case (cloudscape-design/chart-components#217) requires the tooltip wrapped with focus lock to not automatically move focus inside when it appears. Should the user move focus by pressing Tab - it would hit the 1st tab trap, which distributes focus to the last element of the lock content.

See before:

Focusing with Tab navigates to "3" button first. Focusing with Shift+Tab navigates to "1" button first.

Screen.Recording.2026-05-15.at.11.21.31.mov

After:

Screen.Recording.2026-05-15.at.11.22.41.mov

How has this been tested?

• New unit tests

Review checklist

The following items are to be evaluated by the author(s) and the reviewer(s).

Correctness

• Changes include appropriate documentation updates.
• Changes are backward-compatible if not indicated, see CONTRIBUTING.md.
• Changes do not include unsupported browser features, see CONTRIBUTING.md.
• Changes were manually tested for accessibility, see accessibility guidelines.

Security

• If the code handles URLs: all URLs are validated through the checkSafeUrl function.

Testing

• Changes are covered with new/existing unit tests?
• Changes are covered with new/existing integration tests?

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.42%. Comparing base (81c2e51) to head (6c2cfb5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4518   +/-   ##
=======================================
  Coverage   97.42%   97.42%           
=======================================
  Files         936      936           
  Lines       29616    29619    +3     
  Branches    10761    10762    +1     
=======================================
+ Hits        28852    28857    +5     
- Misses        716      755   +39     
+ Partials       48        7   -41     

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