release: v0.1.7 — editing experience: gutter, auto-format, bracket close, drag-drop, outline

feat(core): line number gutter with current line highlight
- .me-gutter rendered alongside textarea, sync-scrolls with content
- .me-gutter-active highlights the line containing the cursor
- config.lineNumbers (default true) to toggle

feat(core): smart Enter auto-formatting
- List continuation: '- ' / '1. ' auto-insert on Enter at end of list item
- Ordered list auto-increment: '1.' → '2.'
- Quote continuation: '> ' auto-insert on Enter at end of quote line
- Empty list/quote item: Enter removes the marker (end list)

feat(core): bracket/quote auto-close
- (), [], {}, <>, "", '', ``, **, __ auto-close pairs
- Selection wrapping: select text then press ( → wraps as (text)
- config.autoBrackets (default true) to toggle

feat(core): drag & drop file support
- Drop image files → auto base64 inline insert ![](data:...)
- Drop text/code files → insert file contents
- Drop external text from browser → insert at cursor

feat(core): outline/TOC panel
- Extracts headings from rendered HTML preview
- Nested tree with indentation by heading level
- Click to scroll-jump in both preview and textarea
- config.outline (default false) to toggle

style: gutter, outline panel, current line highlight CSS

test: 11 new tests for gutter, auto-format, bracket close, outline (532 total)

chore: bump version 0.1.6 → 0.1.7 across all files, site, types

README.md

@@ -2,9 +2,9 @@
 
 > 轻量、零依赖、精致美观的 Markdown Editor 库。单文件，开箱即用，中文优先。
 
-[![npm version](https://img.shields.io/badge/version-0.1.6-blue.svg)](https://www.npmjs.com/package/@metona-team/metona-editor)
+[![npm version](https://img.shields.io/badge/version-0.1.7-blue.svg)](https://www.npmjs.com/package/@metona-team/metona-editor)
 [![license](https://img.shields.io/badge/license-MIT-green.svg)](./LICENSE)
-[![tests](https://img.shields.io/badge/tests-521%20passed-brightgreen.svg)](./tests)
+[![tests](https://img.shields.io/badge/tests-532%20passed-brightgreen.svg)](./tests)
 [![coverage](https://img.shields.io/badge/coverage-97%25-brightgreen.svg)](./tests)
 
 ---
@@ -19,6 +19,7 @@
 - **安全** — 内置 XSS 防护（`javascript:`/`vbscript:`/`file:` 协议过滤），HTML 转义，`safeUrl` 净化
 - **内置解析器** — 自研 CommonMark 子集 + GFM 扩展（表格含列对齐、任务列表、上下标、数学公式、脚注、嵌套列表、emoji 短码等），可整体替换
 - **三模式视图** — edit / split / preview 自由切换，分屏拖拽调整比例，滚动同步，模式切换保持滚动位置
+- **编辑体验** — 行号装订线 + 当前行高亮、智能 Enter（列表/引用自动延续）、括号/引号自动闭合、拖放文件/图片/文本、大纲/目录面板
 - **主题系统** — light / dark / auto / warm 四套预设，CSS 变量定制，实例级主题隔离，外部主题跟随（syncWithElement / adoptFromParent），主题继承（extends），跟随系统主题，@media print 打印样式
 - **国际化** — zh-CN / en-US 完整翻译，实例级语言隔离，复数规则，命名空间，动态远程加载翻译包，RTL 支持
 - **历史栈** — 撤销/重做，防抖合并（可配置延迟），可配置上限