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

dist/metona-editor.esm.js

@@ -1820,7 +1820,7 @@ const searchReplacePlugin = {
         if (!document.getElementById('me-search-style')) {
             const style = document.createElement('style');
             style.id = 'me-search-style';
-            style.textContent = `.me-search{position:absolute;top:8px;right:12px;z-index:20;display:flex;flex-direction:column;gap:6px;padding:8px;background:var(--md-toolbar-bg,#f8f9fa);border:1px solid var(--md-border,rgba(0,0,0,0.1));border-radius:8px;box-shadow:0 8px 24px -8px rgba(0,0,0,0.2);font-size:13px;min-width:280px}.me-search-row{display:flex;gap:4px;align-items:center}.me-search input{flex:1;min-width:0;padding:4px 8px;border:1px solid var(--md-border,rgba(0,0,0,0.15));border-radius:4px;background:var(--md-textarea-bg,#fff);color:var(--md-text,#1f2937);font-size:13px}.me-search input:focus{outline:none;border-color:var(--md-accent,#3b82f6)}.me-search button{padding:4px 8px;border:1px solid var(--md-border,rgba(0,0,0,0.15));background:var(--md-bg,#fff);color:var(--md-text,#1f2937);border-radius:4px;cursor:pointer;font-size:12px;line-height:1}.me-search button:hover{background:var(--md-accent,#3b82f6);color:#fff;border-color:var(--md-accent,#3b82f6)}.me-search .me-search-count{color:var(--md-muted,#6b7280);font-size:12px;min-width:60px;text-align:center}.me-search .me-search-close{padding:2px 6px}`;
+            style.textContent = `.me-search{position:absolute;top:10px;right:16px;z-index:20;display:flex;flex-direction:column;gap:8px;padding:12px;background:var(--md-bg,#1c2029);border:1px solid var(--md-border,rgba(255,255,255,0.12));border-radius:10px;box-shadow:0 12px 40px -8px rgba(0,0,0,0.4),0 0 0 1px rgba(255,255,255,0.05);font-size:13px;min-width:300px;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);animation:meSearchIn .18s ease-out}@keyframes meSearchIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.me-search-row{display:flex;gap:6px;align-items:center}.me-search-row+.me-search-row{margin-top:2px}.me-search input{flex:1;min-width:0;padding:7px 10px;border:1px solid var(--md-border,rgba(255,255,255,0.12));border-radius:6px;background:var(--md-textarea-bg,rgba(255,255,255,0.04));color:var(--md-text,#e6e8eb);font-size:13px;outline:none;transition:border-color .15s,box-shadow .15s}.me-search input::placeholder{color:var(--md-muted,#6b7280)}.me-search input:focus{border-color:var(--md-accent,#3b82f6);box-shadow:0 0 0 3px rgba(59,130,246,0.15)}.me-search .me-search-btn{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;padding:0;border:1px solid rgba(255,255,255,0.08);border-radius:5px;background:rgba(255,255,255,0.04);color:var(--md-muted,#9ca3af);cursor:pointer;transition:all .12s;flex-shrink:0}.me-search .me-search-btn:hover{background:var(--md-accent,#3b82f6);color:#fff;border-color:var(--md-accent,#3b82f6)}.me-search .me-search-btn:active{transform:scale(.92)}.me-search .me-search-btn.me-active{background:var(--md-accent,#3b82f6);color:#fff;border-color:var(--md-accent,#3b82f6)}.me-search .me-search-btn svg{width:14px;height:14px}.me-search .me-search-count{color:var(--md-muted,#9ca3af);font-size:11.5px;min-width:28px;text-align:center;font-variant-numeric:tabular-nums}.me-search .me-search-close{margin-left:2px;font-size:16px;line-height:1}.me-search .me-search-close:hover{background:#ef4444;border-color:#ef4444}.me-search .me-search-replace-one,.me-search .me-search-replace-all{width:auto;padding:5px 10px;font-size:12px;font-weight:500;letter-spacing:.01em}.me-search .me-search-replace-all{background:rgba(59,130,246,0.12);border-color:rgba(59,130,246,0.3);color:var(--md-accent,#60a5fa)}.me-search .me-search-replace-all:hover{background:var(--md-accent,#3b82f6);color:#fff}`;
             document.head.appendChild(style);
         }
         const state = {
@@ -1860,7 +1860,7 @@ const searchReplacePlugin = {
             const panel = document.createElement('div');
             panel.className = 'me-search';
             panel.dataset.replace = showReplace ? '1' : '0';
-            panel.innerHTML = `<div class="me-search-row"><input type="text" class="me-search-find" placeholder="${t('searchPlaceholder') || 'Find'}" value="${escapeAttr(selected)}"/><button class="me-search-prev">↑</button><button class="me-search-next">↓</button><span class="me-search-count"></span><button class="me-search-regex" title="Regex">.*</button><button class="me-search-close">×</button></div><div class="me-search-row me-search-replace-row"><input type="text" class="me-search-replace" placeholder="${t('replacePlaceholder') || 'Replace'}"/><button class="me-search-replace-one">${t('replace') || 'Replace'}</button><button class="me-search-replace-all">${t('replaceAll') || 'All'}</button></div>`;
+            panel.innerHTML = `<div class="me-search-row"><input type="text" class="me-search-find" placeholder="${t('searchPlaceholder') || 'Find'}" value="${escapeAttr(selected)}"/><button class="me-search-btn me-search-prev" title="${t('findPrev') || 'Previous'}"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="18 15 12 9 6 15"/></svg></button><button class="me-search-btn me-search-next" title="${t('findNext') || 'Next'}"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><polyline points="6 9 12 15 18 9"/></svg></button><span class="me-search-count"></span><button class="me-search-btn me-search-regex" title="Regex">.*</button><button class="me-search-btn me-search-close" title="${t('close') || 'Close'}"><svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg></button></div><div class="me-search-row me-search-replace-row"><input type="text" class="me-search-replace" placeholder="${t('replacePlaceholder') || 'Replace'}"/><button class="me-search-btn me-search-replace-one">${t('replace') || 'Replace'}</button><button class="me-search-btn me-search-replace-all">${t('replaceAll') || 'All'}</button></div>`;
             editor.el.appendChild(panel);
             state._panel = panel;
             _updateReplaceVisible();
@@ -4388,9 +4388,9 @@ const animationUtils = {
 /**
  * MetonaEditor — Type-safe, lightweight Markdown Editor
  * @module metona-editor
- * @version 0.2.3
+ * @version 0.2.4
  */
-const VERSION = '0.2.3';
+const VERSION = '0.2.4';
 const globalPlugins = [];
 MarkdownEditor.on('beforeCreate', (editor) => {
     if (!editor || editor.isDestroyed())