Calendar integration redesign and page
Redesigned the calendar integration page so it’s easier to see what’s connected and manage scheduling-related settings.

- Shipped a clearer calendar integration page that highlights connection status, which calendars are linked, and what ActRun is allowed to do with them.
- Simplified the setup and review flow so non-technical users can connect calendars in a few guided steps, while power users can still see all the important details.
- Laid the groundwork for smarter scheduling workflows by making calendar permissions and available actions more transparent.