fix: disallow focus of calendar cells outside the month

[Persists]

Closes #8128

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

[LFDanLu]

Thanks for the PR! This seems to fix the issue with keyboard navigation when the duplicate dates aren't hidden via display: none but will need to test for cases such as were described in #3257 (comment) (I doubt it since this is unrelated to making this "outside dates" interactive).

We should probably add additional styling to the story to not apply selected styles on dates that are outside the current month so that you don't get the following effect:

bit confusing when I first saw it

[Persists]

Thank you for the review! 👍

I've updated the styles to exclude selected states for dates outside the current month.

If there is anything else i can improve additionally to help you, please let me know!

[LFDanLu]

I think this is fine, will see about getting another person on the team to take a look