feat(sheat): add showCloseButton prop to SheetContent to conditionally render the close button.

[shabanhr]

Overview

This PR adds a new showCloseButton prop to the SheetContent component. This allows developers to conditionally toggle the visibility of the default "X" close button in the upper right corner.

Motivation

Currently, the close button is rendered automatically. There are use cases where developers might want to:

• Implement a custom close mechanism/button elsewhere in the UI.
• Prevent users from closing the sheet via the corner button (e.g., during a critical flow).
• Create a cleaner UI without the default icon.

Usage

The prop defaults to true (current behavior) if undefined, ensuring no breaking changes. To hide the button, simply pass false:

<SheetContent showCloseButton={false}>
  <SheetHeader>
    <SheetTitle>Edit profile</SheetTitle>
    <SheetDescription>
      Make changes to your profile here.
    </SheetDescription>
  </SheetHeader>
  {/* Content */}
</SheetContent>

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