Test: Implement E2E: Stellar Wallet Connection and Disconnection Flow

[EzeanoroEbuka]

Summary
This PR resolves #466 by implementing integration/E2E-style tests for the Stellar wallet connection flow (Freighter/Albedo) using Jest and React Testing Library.

Changes Proposed

Added __tests__/components/wallet-connection.test.tsx to test the wallet connection interface.

Mocked the useWallet hook to deterministically simulate disconnected, connected, and error states without relying on an active browser extension.

Implemented the happy path tests for triggering the connect and disconnect functions and verifying the UI updates (e.g., displaying the truncated Stellar address).

Implemented edge case coverage for when a user rejects the connection prompt or an error occurs during the Web3 handshake.

Acceptance Criteria Checklist

[x] Forked the repository and created a new branch using the designated branch name.

[x] Wrote the required tests using Jest / React Testing Library.

[x] Mocked external dependencies (Web3 wallets) to prevent flaky tests.

[x] Ensured the new tests pass reliably and meet code coverage standards.

[x] Ran the full test suite locally to verify no existing tests are broken.

Related Issues
Closes #466

How to Test
Run the Jest test suite locally to verify the wallet flow logic:
Bash

npm run test

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