chore: update CHANGELOG.md to include faster analytics processing for improved daily stats updates across multiple sites

CHANGELOG.md

@@ -8,6 +8,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 
 ### Added
 
+- **Faster analytics processing for all sites.** We've upgraded how your daily analytics are calculated behind the scenes. Instead of processing sites one by one, we now analyze multiple sites simultaneously using a smart parallel system. This means your daily stats—like visitor counts and page views—are updated more quickly and consistently, even as we handle data from thousands of websites.
 - **Lighter dashboard data transfers.** Your dashboard now loads data in smaller, focused pieces instead of one massive bundle. This means faster loading times—especially on slower connections—and your analytics appear section by section as they become ready, rather than making you wait for everything at once.
 - **Smarter data fetching.** Your dashboard now automatically prevents duplicate requests when multiple components ask for the same data at the same time. It also briefly caches recent responses, so switching between pages feels instant while still keeping everything up to date. This reduces server load and makes the app feel snappier.
 - **Smarter dashboard updates.** Your dashboard now knows when you're actively viewing it versus when it's in the background. When you switch to another tab, we intelligently slow down data refreshes to save resources, then instantly catch up when you return. This keeps your analytics current without putting unnecessary load on the system.