feat: add closeButtonPosition prop to customize close button placement

[Alex-Huaracha]

Summary

Adds a closeButtonPosition prop to allow customizing the position of the close button on toasts.

• Adds new CloseButtonPosition type ('left' | 'right')
• Configurable at both Toaster level (global) and individual toast level
• Default position remains 'left' to maintain backward compatibility
• Includes RTL support

Usage

// Global - all toasts with close button on the right
<Toaster closeButton closeButtonPosition="right" />
// Per-toast override
toast('Message', { 
  closeButton: true, 
  closeButtonPosition: 'right' 
})
Closes #747

[vercel]

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Project	Deployment	Actions	Updated (UTC)
sonner	Error		Mar 16, 2026 9:39pm