Notification Toast Provider

[gabito1451]

Description:
Build a context provider and floating UI component for temporary success/error toast notifications.
Requirements and context:

• Toasts should auto-dismiss after 3 seconds.
• Support overlapping or stacking logic.
  Suggested execution:

1. git checkout -b feature/ui-toast
2. Create context in frontend/src/context/ToastContext.tsx.
   Test and commit:

• Test rapid fire triggers to ensure no overlap overlap bugs.
• feat: implement global toast notification system
  Guidelines: Closes #[issue_id].

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[peternnadi1999]

@peternnadi1999 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I’d like to take on #86: Notification Toast Provider.

I’ll build a global ToastContext with a floating toast UI that supports stacking, auto-dismiss after 3 seconds, and handles rapid-fire triggers without overlap issues. Fully tested and ready for integration.

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