Update CHANGELOG.md

Author: mrubens

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 - Rate-limit setting updated to be per-profile (thanks @ross!)
 - You can now place multiple rules files in the .roo/rules/ and .roo/rules-{mode}/ folders (thanks @upamune!)
+- Prevent unnecessary autoscroll when buttons appear (thanks @shtse8!)
 - Add Gemini 2.5 Pro Preview to Vertex AI (thanks @nbihan-mediware!)
 - Tidy up following ClineProvider refactor (thanks @diarmidmackenzie!)
 - Clamp negative line numbers when reading files (thanks @KJ7LNW!)