release: v0.1.4 — parser enhancement, new syntax, performance optimization

feat(parser): comprehensive Markdown parser enhancement
- Add nested list support (multi-level unordered/ordered, mixed nesting)
- Add Setext headings (=== / ---)
- Add indented code blocks (4-space indent)
- Add HTML comment passthrough (<!-- -->)
- Add entity reference protection (&amp; &#169;)
- Add ordered list start attribute
- Add link title single-quote support
- Add LaTeX math formulas ($inline$ / $$block$$)
- Add footnote support ([^1] ref + [^1]: definition)
- Add definition lists (term\n: definition)
- Extend emoji map from 85 to 150+ common emojis
- Fix backtick code block matching (CommonMark spec)
- Fix italic regex character truncation (lookbehind assertions)
- Fix superscript/subscript/strikethrough ambiguity
- Fix blockquote prefix handling (>text without space)
- Enhance safeUrl filtering (additional protocol checks)
- Enhance slugify (Unicode NFKC normalization)

perf(parser): single-pass inline scanning, render cache, pre-compiled regex
- Replace 14-step chained regex with unified single-pass scanInline()
- Add cachedRenderInline() with FIFO LRU eviction (300-entry cap)
- Pre-compile 15+ static regex constants for block boundary detection
- Skip redundant style='text-align:left' on default-aligned table cells

style(parser): add CSS for footnotes, definition lists, math formulas, sup/sub

test(parser): 44 new test cases covering all v0.1.4 syntax additions (469 total)

chore: bump version 0.1.3 → 0.1.4 across all source files, docs, site pages

src/index.js

@@ -1,7 +1,7 @@
 /**
  * MetonaEditor - 轻量级 Markdown Editor 库
  * @module metona-editor
- * @version 0.1.3
+ * @version 0.1.4
  * @author thzxx
  * @description 现代化、零依赖、易扩展、易维护、易使用的 Markdown 编辑器库。单文件，开箱即用。
  * @license MIT
@@ -21,7 +21,7 @@
  */
 
 import { MarkdownEditor } from './core.js';
-import { parseMarkdown, safeUrl, slugify } from './parser.js';
+import { parseMarkdown, safeUrl, slugify, clearRenderCache } from './parser.js';
 import { themeUtils } from './themes.js';
 import { i18nUtils } from './i18n.js';
 import { pluginUtils, presetPlugins } from './plugins.js';
@@ -29,7 +29,7 @@ import { animationUtils } from './animations.js';
 import { DEFAULTS, ICONS, THEMES, EDIT_MODES, DEFAULT_TOOLBAR, TOOLBAR_ACTIONS } from './constants.js';
 
 // 版本信息
-const VERSION = '0.1.3';
+const VERSION = '0.1.4';
 
 /**
  * 全局默认插件队列
@@ -193,6 +193,7 @@ const api = {
   parseMarkdown,
   safeUrl,
   slugify,
+  clearRenderCache,
 
   // 工具集
   themes: themeUtils,
@@ -233,6 +234,7 @@ export {
   parseMarkdown,
   safeUrl,
   slugify,
+  clearRenderCache,
   themeUtils,
   i18nUtils,
   pluginUtils,