Add the ability to filter contacts who opened an email within a specific timeframe, such as the last 7 days, 30 days, or a custom date range. Currently, users can filter contacts based on whether they opened a specific email. However, they would also like to filter by when the open happened, so they can identify recently engaged supporters and follow up more strategically. This would help organizations better segment contacts based on recent engagement, improve follow-up timing, and create more targeted outreach lists.