💄 Update upload preview link and overlay behavior

Enhance the upload preview by making it clickable and improving the overlay transition effects for a better user experience. 📈 Update metrics to use configurable window days Refactor metrics calculations to utilize a constant for the number of days, improving maintainability and clarity in the dashboard. 📈 Enhance review metrics tracking Add metrics for open rates and completion rates from sent and open cohorts to improve analytics on event reviews.