chore: update changelog with detailed auto sync feature description and improvements

CHANGELOG.md

@@ -1,6 +1,26 @@
-## Feature
+# Changelog
 
-- Better debugging information for upload failures.
-- Support synchronising Obsidian callouts as Notion callout blocks.
-- 优化控制台输出的调试信息。
-- 支持将 Obsidian Callout 同步为 Notion Callout 区块。
+## [Unreleased]
+
+### Added
+
+- **Auto Sync Feature**: Automatically sync notes to Notion when content or frontmatter changes
+  - Configurable delay (default: 5 seconds, minimum: 2 seconds)
+  - Support for multiple database syncing
+  - Smart detection to avoid sync loops when only NotionID is updated
+  - Content hash comparison to detect body text changes
+  - Works on both desktop and mobile platforms
+- Added comprehensive i18n support for all UI elements and notifications
+- Added prerelease workflow for beta testing via GitHub Actions and BRAT
+
+### Changed
+
+- Enhanced settings tab with auto-sync configuration options
+- Improved debug logging for better troubleshooting
+- Updated documentation with auto-sync usage guide and troubleshooting section
+
+### Fixed
+
+- Fixed mobile compatibility issues by using `window.setTimeout` instead of `NodeJS.Timeout`
+- Fixed sync loop prevention logic to properly handle frontmatter and content changes
+- Fixed cache update timing to ensure accurate change detection