fix(rich-text): 修复 v-html 样式不生效问题

移除 scoped 和 :deep()，使用 #rich-text-renderer ID 选择器限制作用范围。
参考 @tarojs/taro/html.css 添加完整 HTML4 样式支持。

- 移除 scoped（v-html 内容不受 scoped 影响）
- 移除 :deep()（小程序 WXSS 不支持）
- 新增完整的 .h5-* 样式定义（表格、代码、列表等）
- 使用 ID 选择器避免全局样式污染

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

@@ -263,81 +263,294 @@ watch(() => props.enableTransform, () => {
 // transformElement 已在初始化时设置，watch immediate 已处理首次渲染
 </script>
 
-<style lang="less" scoped>
-.rich-text-content {
-  // Taro v-html 基础样式（替代 @tarojs/taro/html.css）
-  :deep(.h5-p) {
-    margin: 16rpx 0;
+<style lang="less">
+// 注意：v-html 内容不受 scoped 样式影响，因此不使用 scoped
+// 通过 #rich-text-renderer ID 选择器限制样式作用范围，避免污染全局
+// 参考 @tarojs/taro/html.css 的完整 HTML4 样式
+#rich-text-renderer {
+  // ========== 基础显示属性 ==========
+  .h5-html,
+  .h5-address,
+  .h5-blockquote,
+  .h5-body,
+  .h5-dd,
+  .h5-div,
+  .h5-dl,
+  .h5-dt,
+  .h5-fieldset,
+  .h5-form,
+  .h5-frame,
+  .h5-frameset,
+  .h5-h1,
+  .h5-h2,
+  .h5-h3,
+  .h5-h4,
+  .h5-h5,
+  .h5-h6,
+  .h5-noframes,
+  .h5-ol,
+  .h5-p,
+  .h5-ul,
+  .h5-center,
+  .h5-dir,
+  .h5-hr,
+  .h5-menu,
+  .h5-pre {
+    display: block;
+    unicode-bidi: embed;
   }
 
-  :deep(.h5-img) {
-    max-width: 100%;
-    height: auto;
-    display: block;
+  .h5-li {
+    display: list-item;
+  }
+
+  .h5-head {
+    display: none;
+  }
+
+  // ========== 表格样式 ==========
+  .h5-table {
+    display: table;
+    border-spacing: 2px;
+  }
+
+  .h5-tr {
+    display: table-row;
+  }
+
+  .h5-thead {
+    display: table-header-group;
+  }
+
+  .h5-tbody {
+    display: table-row-group;
+  }
+
+  .h5-tfoot {
+    display: table-footer-group;
+  }
+
+  .h5-col {
+    display: table-column;
   }
 
-  :deep(h1) {
-    font-size: 48rpx;
-    font-weight: bold;
-    margin: 32rpx 0 16rpx;
+  .h5-colgroup {
+    display: table-column-group;
   }
 
-  :deep(h2) {
-    font-size: 40rpx;
-    font-weight: bold;
-    margin: 24rpx 0 12rpx;
+  .h5-td,
+  .h5-th {
+    display: table-cell;
   }
 
-  :deep(h3) {
-    font-size: 36rpx;
-    font-weight: bold;
-    margin: 20rpx 0 12rpx;
+  .h5-caption {
+    display: table-caption;
+    text-align: center;
   }
 
-  :deep(h4) {
-    font-size: 32rpx;
-    font-weight: bold;
-    margin: 16rpx 0 8rpx;
+  .h5-th {
+    text-align: center;
+    font-weight: bolder;
   }
 
-  :deep(p) {
-    font-size: 28rpx;
-    line-height: 1.6;
-    margin: 12rpx 0;
-    color: #333;
+  .h5-thead,
+  .h5-tbody,
+  .h5-tfoot {
+    vertical-align: middle;
   }
 
-  :deep(ul),
-  :deep(ol) {
-    padding-left: 48rpx;
-    margin: 16rpx 0;
+  .h5-td,
+  .h5-th,
+  .h5-tr {
+    vertical-align: inherit;
   }
 
-  :deep(li) {
-    font-size: 28rpx;
-    line-height: 1.6;
-    margin: 8rpx 0;
+  // ========== 标题样式 ==========
+  .h5-body {
+    margin: 8px;
   }
 
-  :deep(strong) {
-    font-weight: bold;
+  .h5-h1 {
+    margin: 0.67em 0;
+    font-size: 2em;
   }
 
-  :deep(em) {
+  .h5-h2 {
+    margin: 0.75em 0;
+    font-size: 1.5em;
+  }
+
+  .h5-h3 {
+    margin: 0.83em 0;
+    font-size: 1.17em;
+  }
+
+  .h5-h4,
+  .h5-p,
+  .h5-blockquote,
+  .h5-ul,
+  .h5-fieldset,
+  .h5-form,
+  .h5-ol,
+  .h5-dl,
+  .h5-dir,
+  .h5-menu {
+    margin: 1.12em 0;
+  }
+
+  .h5-h5 {
+    margin: 1.5em 0;
+    font-size: 0.83em;
+  }
+
+  .h5-h6 {
+    margin: 1.67em 0;
+    font-size: 0.75em;
+  }
+
+  .h5-h1,
+  .h5-h2,
+  .h5-h3,
+  .h5-h4,
+  .h5-h5,
+  .h5-h6 {
+    line-height: 1;
+  }
+
+  .h5-h1,
+  .h5-h2,
+  .h5-h3,
+  .h5-h4,
+  .h5-h5,
+  .h5-h6,
+  .h5-b,
+  .h5-strong {
+    font-weight: bolder;
+  }
+
+  // ========== 文本样式 ==========
+  .h5-blockquote {
+    margin-left: 40px;
+    margin-right: 40px;
+  }
+
+  .h5-i,
+  .h5-cite,
+  .h5-em,
+  .h5-var,
+  .h5-address {
     font-style: italic;
   }
 
-  :deep(a) {
-    color: #1989fa;
+  .h5-pre,
+  .h5-tt,
+  .h5-code,
+  .h5-kbd,
+  .h5-samp {
+    font-family: monospace;
+  }
+
+  .h5-pre {
+    white-space: pre;
+  }
+
+  .h5-big {
+    font-size: 1.17em;
+  }
+
+  .h5-small,
+  .h5-sub,
+  .h5-sup {
+    font-size: 0.83em;
+  }
+
+  .h5-sub {
+    vertical-align: sub;
+  }
+
+  .h5-sup {
+    vertical-align: super;
+  }
+
+  .h5-s,
+  .h5-strike,
+  .h5-del {
+    text-decoration: line-through;
+  }
+
+  .h5-u,
+  .h5-ins {
     text-decoration: underline;
   }
 
-  :deep(span) {
-    font-size: 28rpx;
+  .h5-center {
+    text-align: center;
+  }
+
+  // ========== 列表样式 ==========
+  .h5-ol,
+  .h5-ul,
+  .h5-dir,
+  .h5-menu,
+  .h5-dd {
+    margin-left: 40px;
+  }
+
+  .h5-ol {
+    list-style-type: decimal;
+  }
+
+  .h5-ol .h5-ul,
+  .h5-ul .h5-ol,
+  .h5-ul .h5-ul,
+  .h5-ol .h5-ol {
+    margin-top: 0;
+    margin-bottom: 0;
+  }
+
+  // ========== 其他元素 ==========
+  .h5-button,
+  .h5-textarea,
+  .h5-input,
+  .h5-select {
+    display: inline-block;
+  }
+
+  input[type="hidden"] {
+    display: none !important;
+  }
+
+  .h5-a {
+    display: inline;
+  }
+
+  .h5-button::after {
+    border: none;
+  }
+
+  .h5-span {
+    display: inline;
+  }
+
+  .h5-hr {
+    border: 1px inset;
+  }
+
+  .h5-br::before {
+    white-space: pre-line;
+    content: "\A";
+  }
+
+  // ========== 自定义补充样式 ==========
+  // 图片样式（transformElement 已添加 mode 和 style，这里做兜底）
+  .h5-img,
+  img {
+    max-width: 100%;
+    height: auto;
   }
 
-  // 文件链接样式
-  :deep(div[data-is-link="true"]) {
+  // 文件链接交互样式
+  div[data-is-link="true"] {
     cursor: pointer;
     transition: opacity 0.2s;