Date Picker: Fix date picker event handling to account for shadowDOM

[raymondboswel]

Description

Date picker event handling did not account for use within shadowDOM. Updated to use composedPath, which works across shadowDOM boundary.

References #

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

How Has This Been Tested?

I reproduced the issue here: https://github.com/raymondboswel/modus-datepicker-reproduction.

I then implemented the fix in a local copy of modus-web-components and installed the local version in the
reproduction project, verifying the fix. I also ran the modus-web-components test suite with no failures.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

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