fix(markdown): unify table border color and fix rounded corner gaps

[pengfeixx]

Use a dedicated --table-border (10% overlay) for the table frame and cell grid, and hide the table's outer left/right/bottom borders so the rounded block border closes cleanly without clipped-line gaps.

表格边框改用专用 --table-border（10% 半透明叠加），外框与单元格网格线
同色；隐藏表格左/右/底外边框，由外层圆角边框封闭，消除转角缺口。

Log: 修复Markdown表格边框颜色不一致及圆角转角缺口
Influence: Markdown预览区表格边框颜色统一、转角渲染完整，深浅色主题均适配。

Summary by Sourcery

Unify Markdown table borders and close rounded corners cleanly across themes.

Bug Fixes:

• Fix rounded Markdown table corners by letting the outer container provide the side and bottom borders without clipped-line gaps.

Enhancements:

• Unify Markdown table frame and cell grid colors with a dedicated theme-aware table border color for consistent light and dark mode rendering.

[sourcery-ai]

Reviewer's Guide

Unifies Markdown table frame and cell-grid colors through a light/dark theme-aware --table-border token, and hides conflicting collapsed-table outer edges so the surrounding rounded border renders complete corners without gaps.

File-Level Changes

Change	Details	Files
Introduces a theme-aware table border token and applies it consistently to the rounded table frame and cell grid.	Defines a 10% translucent border variable for light and dark themes. Replaces the frame and cell border colors with the shared table-specific variable. Removes the dark-theme border override so the shared token controls both themes.	src/editor/markdown/web/build/style.css src/editor/markdown/web/theme.css
Adjusts collapsed table border rendering so the outer rounded container cleanly closes the table edges.	Hides the table’s left, right, and bottom outer border styles while retaining the wrapper’s rounded border. Keeps the table flush with the wrapper to avoid duplicate side borders and clipped corner gaps.	src/editor/markdown/web/build/style.css src/editor/markdown/web/theme.css

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[sourcery-ai]

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[deepin-ci-robot]

deepin pr auto review

🤖 AI 代码审查报告

总体评分： 98 分 (通过阈值: 70分)

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📊 总体评价

项目	结果
审查结论	代码审查通过
评分详情	总体评分 98 分，大于 70 分通过阈值，代码质量符合要求。本次提交统一了 Markdown 表格边框颜色并修复了圆角缝隙问题，CSS 变量定义合理，注释详尽，无安全漏洞。

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🔍 详细分析

1. 语法逻辑 ✅

评价： 优秀 ✅ 通过

潜在问题：
✅ 未发现明显问题

建议： CSS 语法正确，变量定义与级联覆盖逻辑清晰，border-collapse 下 hidden 优先级规则运用准确

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2. 代码质量 ✅

评价： 优秀 ✅ 通过

潜在问题：

1. src/editor/markdown/web/build/style.css:1 - build/style.css 为前端编译产物目录下的文件，手动编辑可能导致后续构建时被覆盖，建议确认构建流程是否自动生成此文件

建议： 建议将 build/style.css 纳入构建流程自动生成，避免源文件与编译产物不同步；当前两处文件内容一致，暂无实际问题

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3. 代码性能 ✅

评价： 优秀 ✅ 通过

潜在问题：
✅ 未发现明显问题

建议： CSS 变量复用有利于浏览器缓存和主题切换性能，无不必要的重绘或回流

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4. 代码安全 🔒

评价： 优秀 ✅ 通过

🔐 发现 0 个安全漏洞

漏洞对比统计：

• 🆕 新增：0 个
• ✅ 修复：0 个
• ➡️ 持平：0 个

安全漏洞详情：
✅ 未发现安全漏洞

建议： 纯 CSS 样式变更，无安全风险

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💡 改进建议代码示例

/* 建议在构建脚本中添加自动拷贝/编译步骤，避免手动同步两份文件 */
/* 例如在 package.json 或 Makefile 中： */
/* cp src/editor/markdown/web/theme.css src/editor/markdown/web/build/style.css */

/* 或者在 .gitignore 中忽略 build/ 目录，仅保留源文件 */
/* echo 'src/editor/markdown/web/build/' >> .gitignore */

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本报告由 AI 代码审查工具自动生成

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: lzwind, pengfeixx

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[pengfeixx]

/merge