docs: add realtime rate limit fix to changelog

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 ### Fixed
 
 - **Tracking script now works on all tracked websites.** Page views were silently failing to record when the tracking script ran on your website. Two issues were at play: the backend was rejecting analytics data sent from tracked sites, and even after that was resolved, events were silently dropped during processing because they were missing a required identifier. Both are now fixed — your dashboard receives visits from all registered domains as expected.
+- **Real-time visitor count no longer stops updating.** The dashboard's live visitor counter would quickly hit a rate limit and stop refreshing, showing "Site not found" errors. The limit was too low for normal polling, especially with multiple tabs open. It now has enough headroom for typical usage.
 - **Funnel details now load correctly.** Opening a funnel showed "Unable to load funnel" with a server error. An internal query was referencing data that no longer existed at that stage of processing, causing it to fail every time. Funnels now load and display step-by-step conversion data as expected.
 - **App switcher and site icons now load correctly.** The Pulse, Drop, and Auth logos in the app switcher — and site favicons on the dashboard — were blocked by the browser's Content Security Policy. The policy now allows images from Ciphera's own domain and Google's favicon service, so all icons display as expected.
 - **Safer campaign date handling.** Campaign analytics now use the same date validation as the rest of the app, including checks for invalid ranges and a maximum span of one year. Previously, campaigns used separate date parsing that skipped these checks.