Hostinger Webmail performance improvements

We've shipped a major performance upgrade to Hostinger Webmail using smart caching with preloading across the webmail API. When you open a folder, we preload the full content of messages on the first two pages into cache for near-instant email opening. For all pages, we preload the next page's message metadata in the background so navigating between pages feels immediate. Cache stays in sync with your IMAP server using QRESYNC, so any changes made in Apple Mail, Thunderbird, Outlook, or other clients are instantly reflected in Webmail with no delays. The result: navigating between folders and pages is now 36% faster (552ms → 354ms), opening a message is 85% faster (263ms → 40ms), and loading message content is 91% faster (308ms → 27ms).