feat: Implement a global Toast Notification system

[AlAfiz]

Description

When a user clicks "Swap" or copies an address, they need clear, animated feedback that pops up and disappears automatically.

Requirements

• Install a notification library like react-hot-toast or sonner.
• Set up the global Toaster provider in the main app layout.
• Update the "Copy Wallet Address" button (from our previous issue) to trigger a green success toast instead of just changing the icon.
• Update the "Swap" button to trigger a loading toast that resolves to a success toast after a 2-second setTimeout.