style(webui): align update card transparency

[qiin2333]

改了啥呀

• 移除检查更新卡片对 --ui-surface-strong 的局部覆盖。
• 直接继承全局 .card 的 --ui-surface，浅色和深色主题都与其他主模块保持同一透明度。
• 原有模糊、边框、阴影和布局全部保留，杂鱼卡片这次只修透明度，不乱动别的啦。

为啥要改

检查更新卡片此前使用 0.88 的强表面背景，比通用主卡片的浅色 0.62 / 深色 0.58 更实，页面层级看起来不一致。

验证

• npm run lint:webui
• npm run test:webui（119 passed）
• npm run build
• Playwright 浅色主题：computed background = --ui-surface（rgba(255, 255, 255, 0.62)）
• Playwright 深色主题：computed background = --ui-surface（rgba(74, 63, 66, 0.58)）

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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📥 Commits

Reviewing files that changed from the base of the PR and between 4eb2095 and 5706b3d.

📒 Files selected for processing (1)

• src_assets/common/assets/web/components/common/VersionCard.vue

💤 Files with no reviewable changes (1)

• src_assets/common/assets/web/components/common/VersionCard.vue

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• GitHub Check: Windows

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Summary by CodeRabbit

• 样式
  • 移除版本卡片的强表面背景色，使卡片外观更加简洁，并更好地适配整体界面风格。

Walkthrough

移除 VersionCard.vue 中 .version-card 的 background: var(--ui-surface-strong); 声明。模板、脚本逻辑和其他样式保持不变。

Changes

Cohort / File(s)	Summary
VersionCard 样式 src_assets/common/assets/web/components/common/VersionCard.vue	移除卡片的强表面背景色声明。

Estimated code review effort: 1 (简单) | ~2 分钟

Merge Risk: ⚪ Minimal · up to 5706b

This PR only aligns the update card’s transparency with the shared card styling while preserving its other visual behavior; no actionable merge-blocking risk remains after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	标题准确概括了更新卡片透明度的样式调整，并明确指出该变更属于 Web UI 样式修改。
Description check	✅ Passed	描述与变更内容直接相关，说明了移除局部背景覆盖的原因、保留的样式以及验证结果。
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch style/webui-update-surface-opacity

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