Partially update an event

Performs a partial update of an event, modifying only the specified fields.

Permission Requirements:

• The authenticated user must be an employee (crew members cannot update events).
• The user must have edit permissions for the event.

Update Behavior:

• Only the fields provided in the request body will be updated.
• Other fields remain unchanged.
• The job field cannot be updated after creation.
• Updating an event triggers calendar sync tasks and notifications as with full updates.

Validation Rules:

• If both start and end are provided, start time must be before end time.
• If only start or end is updated, it must still maintain valid duration with the existing value.
• Event duration must be at least 15 minutes.