chore: calendar new today indicator

[snowystinger]

Closes

Discussion with design, prototype for review.
Update: Design signed off

✅ 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:

[rspbot]

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[snowystinger]

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[rspbot]

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[rspbot]

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[LFDanLu]

the styles looks good to me, but I haven't been able to find the figma files that document this change (especially the dotted -> solid line change for the selection outline).