refactor: align model list buttons, use lucide icons

[alephpiece]

What this PR does

• 模型列表按钮对齐。原本有滚动条会挤占一部分空间，导致按钮上下对不齐。
• 一些 icon 迁移到 lucide 保持风格一致。
  • “编辑模型”改用 lucide pen 图标，更符合“编辑”这个含义。
  • lucide penline 改用 pen，更加简洁。
  • 模型列表、Api key 列表的 MinusOutlined 和 PlusOutlined 改用 lucide minus 和 plus。
  • 管理模型列表的“添加列表中的模型”和“删除列表中的模型”改用 lucide icons。
• ProviderSetting 中几个设置按钮对齐

	BEFORE	AFTER
模型列表
管理模型，添加所有模型
管理模型，移除所有模型
Api key 列表
ProviderSetting 界面按钮对齐

Fixes #

Why we need it and why it was done in this way

The following tradeoffs were made:

The following alternatives were considered:

Links to places where the discussion took place:

Breaking changes

If this PR introduces breaking changes, please describe the changes and the impact on users.

Special notes for your reviewer

Checklist

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Approvers are expected to review this list.

• PR: The PR description is expressive enough and will help future contributors
• Code: Write code that humans can understand and Keep it simple
• Refactor: You have left the code cleaner than you found it (Boy Scout Rule)
• Upgrade: Impact of this change on upgrade flows was considered and addressed if required
• Documentation: A user-guide update was considered and is present (link) or not required. You want a user-guide update if it's a user facing feature.

Release note