chore: delete orphaned mock files (transactions, mock-data, mock-noti…

[IyanuOluwaJesuloba]

Closes #176

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📌 Pull Request Title

📋 Description

Removes three orphaned files identified in the API audit. None were imported by any active page or component, and leaving them posed a maintenance risk - a future contributor could accidentally import from the wrong path and introduce hard-to-debug mock data bugs.

🛠 Changes Implemented

Files deleted

transactions.ts - duplicate of
transactions.ts
with a setTimeout stub, hardcoded mock data, and a conflicting Transaction type ('Completed'/'Cancelled' vs the real file's 'Success'/'Failed')
mock-notifications.ts -10 hardcoded Notification objects, not imported anywhere
mock-data.ts - marked @deprecated in its own JSDoc, exported mockTransactions: never[], not imported anywhere meaningfully

✅ How to Test

1. Setup: Steps to set up the environment.
2. Run Tests: Instructions to verify the changes.
3. Expected Output: What should happen if the changes work correctly.

🔍 Screenshots (if applicable)

Attach screenshots or GIFs to show visual changes.

🚀 Checklist

• Code follows project style guidelines.
• Changes are tested and verified.
• Documentation is updated (if needed).

🔗 Related Issues

• Closes #<ISSUE_NUMBER>
• Resolves #<ISSUE_NUMBER>
• Fixes #<ISSUE_NUMBER>

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