Nav Menus: Delegate click events for move links.

props ankit.gade.
fixes #25594.

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Nav Menu admin: Suppress outlines on expand/collapse arrows. fixes #26398.

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Improve the styling of browser file input controls. Fixes #26393.
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Build RTL stylesheets for color schemes.

props dd32.
fixes #26315.

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Include columns-# CSS class in wp_dashboard() for when the screen supports it.

props westi.
fixes #26354.

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