Add toast notification system to dashboard

[Copilot]

Implements a React Context-based notification system for user feedback.

Components

• NotificationProvider: Manages notification state with counter-based IDs and timeout cleanup
• NotificationContainer: Renders notification stack in top-right corner
• Notification: Individual toast with type-specific styling (info, success, warning, error)

Features

• Auto-dismiss after configurable duration (default 5s)
• Manual close with slide-out animation
• Memory-safe: cleanup on unmount, ref pattern prevents stale closures
• Welcome notification on mount, tab-change feedback

Implementation

// Usage anywhere in component tree
const { addNotification } = useNotification();
addNotification('Operation successful', 'success', 3000);

Constants extracted for animation timing and styling to prevent unnecessary re-renders. Uses FontAwesome icons and Tailwind CSS classes matching existing design system.

Files

• dh_car.html: +150 lines notification system
• NOTIFICATION_SYSTEM.md: API documentation and examples

Original prompt

hi

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