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feat(error): implement comprehensive error handling and logging system (#52)

* feat(error): implement comprehensive error handling and logging system

- Add production-grade logging service with levels (debug, info, warn, error, fatal)
- Add Logger class with context enrichment and optional remote logging
- Create ErrorBoundary component for catching React errors
- Create ErrorFallback component with organic design styling
- Add CompactErrorFallback for inline error display
- Implement global error handler with standardized AppError type
- Add error codes and user-friendly error messages
- Create retry utility with exponential backoff and jitter
- Add retry presets (quick, standard, patient, aggressive)
- Implement useNetworkError hook for network status monitoring
- Implement useIsOnline hook for simple connectivity checks
- Integrate ErrorBoundary in root layout
- Initialize global error handlers on app start

Closes #16

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* test(error): add comprehensive tests for error handling utilities

- Add tests for Logger class (log levels, filtering, context, buffering)
- Add tests for error handler (createAppError, parseError, handleError)
- Add tests for retry utility (retry, withRetry, presets, error detection)
- Increases test coverage from ~5% to ~34%

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* fix(error): address CodeRabbit review feedback

- Add onPress handler to Report Issue button in ErrorFallback
- Add onReportIssue prop for custom report handling
- Fix stale closure in useNetworkError by using ref for previous state
- Validate maxAttempts in retry function (normalize to at least 1)
- Initialize lastError to avoid throwing undefined
- Remove unused type import in error-handler tests

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

260 of 1612 branches covered (16.13%)

Branch coverage included in aggregate %.

126 of 220 new or added lines in 7 files covered. (57.27%)

621 of 1839 relevant lines covered (33.77%)

1.49 hits per line