Add mobile error reporting instrumentation

[TommoHCIO]

Summary

• add a mobile AppErrorBoundary so render crashes are captured consistently with a user-facing recovery screen
• add a provider-agnostic error reporting utility that sanitizes sensitive keys, emails, wallet addresses, bearer tokens, long secrets, and stack traces before dispatch
• document production reporter setup and privacy guardrails for contributors

Validation

• npm install --legacy-peer-deps --package-lock=false
• npm test -- --test-name-pattern error
• npx tsc --noEmit
• git diff --check

Closes #61

Reward address (Base USDC): 0xe87b4889baeee4ed60a1b2bfc7b3a6a17bce4ad6