Feat: Security, DX, and UX Enhancements

[sadeeq6400]

Summary

This pull request introduces several key improvements to the application, focusing on enhancing security, developer experience, and user experience.

Summary of Changes:

[Security] Implemented SSL certificate pinning to prevent man-in-the-middle (MITM) attacks by ensuring the app communicates only with trusted servers.
[Developer Experience] Added robust validation for the Sentry DSN to prevent silent failures in error reporting and ensure that monitoring is always active when configured.
[User Experience] Introduced a session expiration modal to gracefully handle session timeouts, preventing abrupt logouts and providing a better user experience.

Closes #773
Closes #774
Closes #775
Closes #776

Testing Done

• Unit Tests
• Integration Tests
• Manual Verification (e.g., iOS/Android UI checks)

Security Considerations

• Does this store user data securely (e.g., avoiding plain AsyncStorage for sensitive data)?
• Is token handling secure (no token exposure in logs or UI)?
• Are all user inputs validated?
• Is deep link handling safe from malicious payloads?

Performance Considerations

• Are React hooks (useCallback, useMemo) used appropriately to prevent unnecessary renders?
• Is FlatList optimized (e.g., using getItemLayout, keyExtractor)?
• Are asynchronous patterns handled correctly (e.g., useEffect cleanup to avoid memory leaks)?
• Have bundle size impacts been considered?

Checklist

• I have read the CONTRIBUTING guide.
• My code follows the style guidelines of this project.
• I have updated the documentation accordingly.
• Are there architectural changes? If so, is there an Architectural Decision Record (ADR)?

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