Add transaction status toast notifications

[shadrach68]

• closes Web: Add transaction status toast notifications #667

Summary
This PR implements visual feedback for the entire Soroban transaction lifecycle. Previously, users had no indication of progress after submitting a transaction. Now, a persistent toast notification tracks the transaction from simulation through confirmation or failure.

Key Changes

• Toast UI Improvements: Added a loading state to the Toast component featuring a spinner and disabled auto-dismiss for pending transactions.
• Dynamic Updates: Enhanced ToastProvider to allow updating existing toasts by ID, enabling a seamless transition from "Pending" to "Success" or "Error".
• useTransactionToast Hook: Created a reusable hook that maps transaction stages (simulating, signing, submitting, polling) to user-friendly notifications.
• Full Integration: Updated all key transaction entry points:
  • Betting: BettingSection.tsx
  • Creation: CreatePoolForm.tsx and the market creation wizard.
  • Claiming: Batch and individual winnings claims via useClaimWinnings and useClaimAll.
  • Admin: Pool settlement, freezing, and dispute management.

Acceptance Criteria Met

• "Transaction pending" toast shows immediately on submission.
• Toast updates in real-time as the transaction moves through network stages.
• Final status (confirmed/failed) is clearly displayed.
• Failed transactions show human-readable error messages.

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