feat: improving error handling across the major pages

[thostetler]

• Add retry utilities with exponential backoff for transient failures
• Configure React Query with global retry strategy (5xx, timeouts, network errors)
• Add PageErrorBoundary and PageErrorFallback components
• Wrap major pages (/, /search, /classic-form, /abs/*) with error boundaries
• Add useNetworkStatus hook for online/offline detection
• Add NetworkStatusIndicator for app-wide connectivity feedback
• Improve _error.tsx with recovery options and user-friendly messages
• Add tests for retry and network status utilities

[codecov]

Codecov Report

❌ Patch coverage is 66.20000% with 169 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.7%. Comparing base (9678f94) to head (bb03088).

Files with missing lines	Patch %	Lines
...components/PageErrorFallback/PageErrorFallback.tsx	19.2%	110 Missing ⚠️
src/lib/retry.ts	86.9%	29 Missing ⚠️
...components/PageErrorBoundary/PageErrorBoundary.tsx	75.0%	16 Missing ⚠️
src/lib/useNetworkStatus.ts	79.8%	14 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #755     +/-   ##
========================================
- Coverage    71.8%   71.7%   -0.1%     
========================================
  Files         217     222      +5     
  Lines       24485   24934    +449     
  Branches     1402    1452     +50     
========================================
+ Hits        17575   17869    +294     
- Misses       6878    7033    +155     
  Partials       32      32             

Files with missing lines	Coverage Δ
src/api/search/search.ts	45.6% <ø> (+0.1%)	⬆️
src/components/PageErrorBoundary/index.ts	100.0% <100.0%> (ø)
src/components/PageErrorFallback/index.ts	100.0% <100.0%> (ø)
src/pages/paper-form.tsx	70.1% <100.0%> (+0.5%)	⬆️
src/lib/useNetworkStatus.ts	79.8% <79.8%> (ø)
...components/PageErrorBoundary/PageErrorBoundary.tsx	75.0% <75.0%> (ø)
src/lib/retry.ts	86.9% <86.9%> (ø)
...components/PageErrorFallback/PageErrorFallback.tsx	19.2% <19.2%> (ø)

... and 2 files with indirect coverage changes

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