fix: fix Alert accessibility issues

[jsulpis]

Summary

NOT READY, cf todo below

Type

• Enhancement

Summarize concisely:

Fix accessibility issues with the Alert component

What is expected?

• no accessibility issues
• accessibility audit up-to-date

The following changes were made:

• run the a11y-fix skill added in this PR

TODO:

• add a story with a button that triggers a closable Alert
• verify with screen reader

[changeset-bot]

⚠️ No Changeset found

Latest commit: cfabbdf

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