Notification Toast Component

A set of four notification toast components for a web app: Success (green check icon, 'Changes saved successfully'), Error (red X icon, 'Failed to upload file'), Warning (amber triangle icon, 'Storage almost full'), and Info (blue circle-i icon, 'New update available'). Each toast has a close button, subtle left color bar, and auto-dismiss progress indicator at the bottom. Dark background variant, rounded corners, Inter font.