Improve Modal component

[pfferrari]

Closes commercelayer/issues-app/issues/621

What I did

Improved Modal component by:

• Refactoring Modal to rely on dialog element for better accessibility and event management
• Adding dismissible prop to enable Modal dismissibility via backdrop click or Esc key press
• Adding Modal unit test suite

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests).
• Make sure to add/update documentation regarding your changes.
• You are NOT deprecating/removing a feature.

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[gciotola]

@copilot can you add a story to showcase the new dismissible prop on the Modal component? Add just one story.

[Copilot]

@copilot can you add a story to showcase the new dismissible prop on the Modal component? Add just one story.

Implemented in commit c130637: added one new Dismissible Modal story in Modal.stories.tsx to showcase closing via backdrop click and Esc.

[pkg-pr-new]

npm i https://pkg.pr.new/commercelayer/app-elements/@commercelayer/app-elements@1145

commit: c130637