Mock OTP & KYC Verification Logic with useKycStore Integration

[leoAshu]

🚀 Summary

This PR introduces mocked OTP verification logic and a complete mocked KYC flow to enable end-to-end testing of the verification process without requiring real API integrations at this stage.

This PR also integrates countries data from Supabase, centralizing the source of truth for all country-related information in the app.

As part of this update, the previous fiat currencies integration has been removed to simplify configuration and avoid redundant data sources.

Key updates:

• Fetch countries dynamically from Supabase and store in a global state via the useCountry hook.
• Refactored screens and features that previously relied on hardcoded or fiat-based country data.
• Deprecated and removed all references to the old fiat currencies integration.
• Ensures compatibility with verification flows, KYC processes, and forms where country selection is required.
• Mocked OTP verification logic to simulate phone/email verification.
• Implemented a mocked KYC flow, covering identity verification steps and state transitions.
• Introduced useKycStore to manage KYC state globally and integrated it with the existing verify flow.

🧩 Related Issues / Tasks

N/A

🛠️ Type of Change

• 🐞 Bug fix
• ✨ New feature
• 🧨 Breaking change
• 🔨 Enhancement/Refactor
• 📝 Documentation
• 📜 Other (please describe):

✅ Checklist

• The code is formatted with Prettier (npm run format or npx prettier --write .)
• PR references a linked Issue or Task number
• Tested on both iOS and Android devices/emulators
• No unnecessary logs or commented-out code
• UI changes, if any, have been reviewed visually
• All tests are passing (if applicable)
• Added or updated documentation where necessary

📸 Screenshots / Videos (UI changes only)

N/A

🧪 Test Plan

• Verified that OTP mock correctly simulates success/failure cases.
• Ensured KYC flow progresses through identity/phone verification using mocked data.
• Confirmed useKycStore persists and updates KYC state consistently across screens.
• Checked that integration with verify flow works without regressions.