Change CHANGELOG version from 0.2.0 to 0.1.2

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: suma

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## 0.2.0 (Unreleased)
+## 0.1.2 (Unreleased)
 
 - Fixed virtual scroll precision, bitmap scroll anchor, drag coordinate drift, and various UI issues