Feat/wallet connect toast

[devfoma]

Description:

This pr closes #560

This PR adds a success toast notification when a user successfully connects their Stellar wallet via Freighter. It also refactors the provider hierarchy to ensure toast functionality is available globally.

Key Changes:

• Moved ToastProvider to root layout.tsx wrapping StellarProvider.
• Integrated useToast into StellarContext.
• Triggered toast.success("Wallet connected — " + truncatedKey) in the connect workflow.
• Ensured session restoration (page reloads) does not trigger the toast.

Files Modified:

• app/layout.tsx
• components/ui/app-shell.tsx
• context/StellarContext.tsx

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