fix: Date range picker alert not focused on error

[SpyZzey]

Description

In the date range picker, when a user enters an invalid date range, and presses the 'Apply' button, an error message appears. Currently, this is not being focused, creating inaccessible experiences.

Related links, issue #, if available: [AWSUI-61790]

Before

Focus stays on 'Apply' button.

Screen.Recording.2026-03-13.at.15.05.39.mov

After

Focus goes to the Alert.

Screen.Recording.2026-03-13.at.15.05.52.mov

How has this been tested?

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 97.44%. Comparing base (b398201) to head (5861f43).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4355   +/-   ##
=======================================
  Coverage   97.44%   97.44%           
=======================================
  Files         897      897           
  Lines       26402    26406    +4     
  Branches     9528     9530    +2     
=======================================
+ Hits        25728    25732    +4     
  Misses        668      668           
  Partials        6        6           

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