fix: restore scroll position when RTL component preview mounts

[arifwp]

What does this PR do?

Fixes the auto-scroll behavior on the Command component docs page when navigating to:

• /docs/components/radix/command
• /docs/components/base/command

Root Cause

The RTL ComponentPreview renders a LanguageSelector which uses Base UI's Select component. Base UI Select internally renders a hidden input that receives focus on mount, causing the browser to scroll to its position (~4435px down the page).

Fix

Capture window.scrollY before the RTL component mounts, then restore it after mount via requestAnimationFrame.

How to test

1. Navigate to /docs/components/radix/command
2. Page should no longer auto-scroll to bottom on load

Closes #10394

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