Improved inbox UI and performance

This release updated the UI on the Forms page under Org Settings and the Inbox page, added an Inbox filter, and improved .csv downloads for inboxes with many submissions.

Features & Improvements

• Updated the inbox UI on the Forms page under Org Settings and the Inbox page on each Site.
• You can now download a subset of your inbox submissions as a .csv file using the Inbox filter.
• Improved CloudCannon's performance when downloading a .csv file containing many inbox submissions.