Fix(ui): always show actions btn instead of on hover in OutlinedActionListItem

[M1LKT]

目前MCP/Skill的管理界面，各种操作的按钮需要鼠标hover在对应的那一行div上才显示，这很反直觉和不方便使用

当前效果如上图所示

Modifications / 改动点

修改了按钮的渲染条件，常态显示

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results / 运行截图或测试结果

修改后的样式：现在常态显示按钮，不再只有hover的时候才展示

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Checklist / 检查清单

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 🤓 I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
  / 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Enhancements:

• Update OutlinedActionListItem styling so action buttons are visible by default rather than hidden until hover.

[sourcery-ai]

Hey - I've left some high level feedback:

• With opacity: 0 removed, the actions are now always visible but pointer-events: none remains, which may still prevent clicks in the default state; double-check whether this should also be updated to allow interaction without hover.
• The transition: opacity 0.16s ease rule no longer has any effect now that opacity is constant, so consider either reintroducing a state change that uses opacity or removing the transition for clarity.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- With `opacity: 0` removed, the actions are now always visible but `pointer-events: none` remains, which may still prevent clicks in the default state; double-check whether this should also be updated to allow interaction without hover.
- The `transition: opacity 0.16s ease` rule no longer has any effect now that opacity is constant, so consider either reintroducing a state change that uses opacity or removing the transition for clarity.

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[gemini-code-assist]

Code Review

This pull request removes the default zero opacity from action list items to make them visible. However, the reviewer pointed out that the items remain non-interactive because pointer-events: none is still applied in the base styles. It is recommended to remove the pointer-events restriction and clean up the now-redundant hover and transition styles to ensure the component functions correctly.

[gemini-code-assist]

移除 opacity: 0 实现了视觉上的常态显示，但 pointer-events: none; 仍保留在基础样式中，这会导致按钮在非 hover 状态下虽然可见但无法响应点击。为了彻底实现「常态显示」并保证交互正常，建议同时移除 pointer-events: none; 和 transition 属性，并清理后续样式中相关的 :hover 和 :focus-within 冗余规则（如第 125-129 行及 143-146 行）。