feat: v0.2.4 — 搜索面板全面重设计 + 完整安装文档

### Changed
- 搜索面板：暗色玻璃拟态设计，SVG 图标，流畅动画，改进间距和焦点状态
- README / site：补全 npm / CDN / ESM / CJS / 浏览器五种安装方式

### Fixed
- CI 卡死：移除 setInterval，改用纯事件驱动
- 浮动工具栏定位修正
- 浮动工具栏开关按钮修复

CHANGELOG.md

@@ -2,6 +2,19 @@
 
 All notable changes to MetonaEditor will be documented in this file.
 
+## [0.2.4] - 2026-07-25
+
+### Changed
+- **Search panel redesigned**: Dark-themed glass-morphism design with SVG icons, smooth animation, improved spacing and focus states.
+- **README & site install instructions**: Complete npm/CDN/ESM/CJS/Browser import examples added.
+
+### Fixed
+- **CI hang**: Removed `setInterval` polling in floating toolbar; now uses pure event-driven selection detection.
+- **Floating toolbar positioning**: Corrected coordinate system (viewport→pane-local) for accurate placement near selected text.
+- **Floating toolbar toggle button**: Now properly disables/enables via `toggleFloatingToolbar()` API.
+
+---
+
 ## [0.2.3] - 2026-07-25
 
 ### Added