Refactor: Eliminate Unsafe Type Assertions and Improve Type Safety

[Nacho1499]

Closes #680

PR Description:
Refactored and to eliminate unsafe TypeScript assertions. Replaced "blind" type casting with explicit runtime type guards, checks, and proper handling. This ensures the codebase is more resilient to runtime errors and aligns with the project's goal of strict type safety.src/audit/ReportGenerator.tssrc/services/mobilePayments.tsasArray.isArray()instanceof Error

Type of Change:
[x] Chore / Refactor (no functional changes)

Testing Done:
[x] Unit Tests (Type-check passed)
[x] Manual Verification (Verified IAP listener logic and Report generation output)

Security Considerations:
[x] Does this store user data securely (e.g., avoiding plain AsyncStorage for sensitive data)? (N/A)
[x] Is token handling secure (no token exposure in logs or UI)? (Checked, no changes to token handling)
[x] Are all user inputs validated? (Yes, improved runtime validation of receipt data)
[x] Is deep link handling safe from malicious payloads? (N/A)

Performance Considerations:
[x] Are React hooks (, ) used appropriately to prevent unnecessary renders? (N/A)useCallbackuseMemo
[x] Is optimized (e.g., using , )? (N/A)FlatListgetItemLayoutkeyExtractor
[x] Are asynchronous patterns handled correctly (e.g., cleanup to avoid memory leaks)? (Yes, improved block in IAP service)useEffectfinally
[x] Have bundle size impacts been considered? (Minimal/None)

Checklist:
[x] I have read the CONTRIBUTING guide.
[x] My code follows the style guidelines of this project.
[x] I have updated the documentation accordingly.
[x] Are there architectural changes? If so, is there an Architectural Decision Record (ADR)? (No, this is a standards-based refactor)Refactored and to eliminate unsafe TypeScript assertions. Replaced "blind" type casting with explicit runtime type guards, checks, and proper handling. This ensures the codebase is more resilient to runtime errors and aligns with the project's goal of strict type safety.src/audit/ReportGenerator.tssrc/services/mobilePayments.tsasArray.isArray()instanceof Error

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