feat: allow customization of body class in Modal component

[YvonneYu]

Allows user overwriting the default Modal body class through the bodyClass prop.

Closes #

📑 Description

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• Completed

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Name	Status	Preview	Comments	Updated (UTC)
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[shinokada]

To be consistent with other components, please use $$props.classBody:

 class={twMerge('p-6 space-y-6 flex-1 overflow-y-auto overscroll-contain', $$props.classBody)}