feat: enable customization of LivePreviewToggler and update related types #14518
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What?
This PR restores the ability to customize the component responsible for toggling Live Preview.
Historically, Live Preview customization was possible through the
livePreviewtab. After that tab was removed and the functionality was replaced with theLivePreviewTogglerrendered insideDocumentControls, the extension point for customizing the Live Preview trigger was lost. As a result, developers could no longer override or replace the button that toggles Live Preview.This PR reintroduces that capability by allowing the
LivePreviewTogglercomponent to be fully customized.