fix: render beforeNavMenu correctly

[JounQin]

Summary

render beforeNavMenu correctly

Related Issue

N/A

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull request overview

This PR fixes the rendering of the beforeNavMenu prop, which was previously not being passed from the Layout component to the Nav component, preventing it from being displayed.

• Added beforeNavMenu to prop destructuring in Layout component
• Passed beforeNavMenu prop to Nav component
• Repositioned beforeNavMenu rendering in Nav component to appear after the Search component

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/core/src/theme/layout/Layout/index.tsx	Added beforeNavMenu to destructuring and passed it to the Nav component to enable rendering
packages/core/src/theme/components/Nav/index.tsx	Moved beforeNavMenu rendering position to after the Search component

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[SoonIter]

是现在有在这之间插入组件的需求吗

[JounQin]

嗯，样式上跟后面的 nav menu 更贴近，感觉加到 search 前面比较奇怪？

我们原来的实现是用 portal render 到 .rspress-nav-menu，新版本这个 selector 没了，看了下 beforeNavMenu 比较合适

[SoonIter]

可以用 .rp-nav-menu

[JounQin]

rspress/packages/core/src/theme/components/Nav/NavMenu.tsx

Lines 138 to 140 in 6b80077

	if (leftOrRightMenuItems.length === 0) {
	return null;
	}

默认没渲染这个元素，现在的实现 beforeNavMenu 感觉应该是 beforeSearch 更符合语义。