Add button to open calendar app on attendance updated site

[!TIP]

Help move this idea forward

• Use the 👍 reaction to show support for this feature.
• Avoid commenting unless you have relevant information to add; unnecessary comments create noise for subscribers.
• Subscribe to receive notifications about status changes and new comments.

Is your feature request related to a problem? Please describe.

Every time I accept a calendar event from my email client the "attendance updated successfully" site opens. This is a dead end and I can't do anything else other than closing the tab

Describe the solution you'd like

There should be a button to open the calendar event (and optionally jump to the event).

Describe alternatives you've considered

It could also automatically redirect to the calendar app and show the "attendance updated successfully" information in the calendar app.

Additional context

Start by locating the attendance-updated-successfully page in the server repository and tracing the calendar event flow from an accepted email invitation. Add a way to open the calendar event, optionally selecting it, or establish the requested redirect behavior; done means the post-acceptance page offers a usable next step instead of only requiring the tab to be closed.