Editor: Add zoom level control

[Infinite-Null]

Closes: #45127

What?

Added a range slider control to allow users to fine-tune their zoom level in the editor.

Why?

Different screen sizes and content layouts may require different zoom levels for optimal viewing, and a single zoom preset doesn't accommodate these varying needs.

Testing Instructions

1. Open the editor with any post or page
2. Click the zoom-out button in the top right toolbar
3. Verify that a slider appears next to the zoom button
4. Test the slider by dragging it to different positions
5. Click the zoom button again to exit zoom mode

Screencast

Screen.Recording.2025-01-29.at.12.29.45.PM.mov

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Co-authored-by: Infinite-Null <[email protected]>
Co-authored-by: annezazu <[email protected]>

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