chore: bump version to 1.5.6 and add changelog

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

Author: Gnathonic

CHANGELOG.md

@@ -1,5 +1,11 @@
 # Changelog
 
+## [1.5.6] - 2026-03-20
+
+### Fixed
+
+- **Continuous scroll drag stutter** - Fixed a lag spike when starting to drag in continuous scroll modes, especially noticeable on mobile devices
+
 ## [1.5.5] - 2026-03-20
 
 ### Added

package.json

@@ -1,6 +1,6 @@
 {
   "name": "mokuro-reader",
-  "version": "1.5.5",
+  "version": "1.5.6",
   "private": true,
   "scripts": {
     "dev": "vite dev",