fix: Add a highlight on Today in CalendarView

[nguyeenvy]

GitHub Issue: https://github.com/unoplatform/uno/issues/6222

PR Type

What kind of change does this PR introduce?

• Bugfix

Description

PR Checklist

Please check if your PR fulfills the following requirements:

• Commits must be following the Conventional Commits specification
• [X] Tested UWP
• [ ] Tested iOS
• [ ] Tested Android
• [X] Tested WASM
• [ ] Tested MacOS
• [X] Contains No breaking changes

Other information

Internal Issue (If applicable):

[github-actions[bot]]

Azure Static Web Apps: Your stage site is ready! Visit it here: https://salmon-rock-0cfebe70f-1152.eastus2.azurestaticapps.net