Refactor codebase with best practices

[zhyd1997]

eg, show API status code in frontend code logic

[coderabbitai]

A summary of the changes CodeRabbit can apply:

• Implement status-code-aware API error handling by adding a new ActionResult type and docs, adding statusCode and MeetingError to lib/types/meeting.ts, enhancing lib/dal/calBookings.ts and lib/dto/calBookings.ts to include error codes and extraction helpers, refactoring app/(dashboard)/bookings/actions.ts to return ActionResult, updating app/dashboard/page.tsx and app/dashboard/error.tsx to handle and display status codes, enhancing modules/dashboard/utils/errorParser.ts to extract status codes, updating app/api/cal/bookings/route.ts to include statusCode in responses, and adding docs/API_ERROR_HANDLING.md.

• Convert server actions and API error handling to a standardized ActionResult pattern: add lib/types/actionResult.ts and CalBookingsApiError enhancements, update app/(dashboard)/bookings/actions.ts to return ActionResult with helpers and error mapping, modify app/api/cal/bookings/route.ts error payload shape, adapt app/dashboard/page.tsx to handle ActionResult responses, update error parser typings, remove old Meeting type (refactor meeting types), and add docs/API_ERROR_HANDLING.md explaining the new pattern.

• Executed edits - (🔄 Check again to try again)

[coderabbitai]

Caution

The CodeRabbit agent's plans did not produce any file changes.