Four Layer Todo 0.1.6

What's new\n- English interface with automatic, Chinese, and English language selection\n- Existing Chinese task data, folders, frontmatter, and internal values remain compatible\n- Localized guided sample content and English documentation\n- Fixed whiteboard height inheritance and updated Obsidian 1.13 settings compatibility\n- Upgraded Preact to 10.29.8\n\n## Validation\n- npm run build\n- node --check main.js\n- npm audit --audit-level=high\n- Obsidian runtime reload and language-switch task-count check