[Clean Version] Extend PR #3089 – Complete Fiat Input Support in Dual Currency Field

[Dunsin-cyber]

🚀 Summary

This pull request continues from where #3089 left off and cleans up the messy rebase/force-push in #3394. That initial PR laid the groundwork, and this one builds upon it to complete the implementation and resolve remaining issues.

✨ Changes Introduced

A breakdown of what this PR introduces:

• Fixed all failing tests, particularly for ConfirmPayment and SitePreferences.
• ConfirmPayment Fix:
  Added a default mock implementation for getFormattedInCurrency in the SettingsContext. This resolves the failing unit tests in ConfirmPayment/index.test.tsx caused by a missing mock.
• SitePreferences Fix: rewrites the test to focus more on testing the core functionality, like whether the budget was created, the user's input was reflected correctly, and the conversion worked.

🔗 Related Issues or PRs

• Continues work from: Support fiat input in dual currency field #3089
• Fixes: Add unit switching within the "Amount" input #2511 (optional)

🧩 Type of Change

Select the appropriate type:

• fix: Bug fix (non-breaking change which fixes an issue)
• feat!: Breaking change (may break existing functionality)

📸 Screenshots (optional)

Add any relevant screenshots, screen recordings, or UI diffs to help reviewers.

🧪 How This Was Tested

• Manual testing
• Unit/integration tests
• Test environment notes: [Optional: add environment or tool info if relevant]

✅ Checklist

• Code reviewed and cleaned up
• Manual tests run successfully
• Automated tests added or updated
• Documentation and guides updated (if applicable)

For UI-related changes:

• Dark mode tested
• Responsive layout verified

[Dunsin-cyber]

hi @pavanjoshi914 , this PR is now ready for review 🚀⚡