Performance and Accessibility Overhaul: Instant Loading, PWA Support, and Universal Access

[Copilot]

This PR implements a comprehensive performance and accessibility overhaul of the Nuts Finance application to achieve instant loading, snappy interactions, and universal accessibility. The changes address core UI/UX, performance bottlenecks, and accessibility barriers identified during the analysis.

🚀 Performance Improvements

Font Loading Optimization

Eliminated render-blocking font loads by moving from CSS imports to preload strategy with fallbacks:

<link rel="preload" href="fonts.googleapis.com/..." as="style" onload="this.rel='stylesheet'" />

Service Worker Implementation

Added comprehensive caching strategy for static assets and API responses:

• Cache-first strategy for static assets
• Network-first with timeout for API calls
• Background sync for offline actions
• Smart cache invalidation

Advanced Chunk Splitting

Redesigned Vite configuration with granular vendor chunks:

manualChunks: {
  'react-vendor': ['react', 'react-dom'],
  'query-vendor': ['@tanstack/react-query'],
  'ui-radix': ['@radix-ui/react-dialog', '@radix-ui/react-dropdown-menu', ...],
  'chart-vendor': ['recharts'],
  'form-vendor': ['react-hook-form', '@hookform/resolvers', 'zod'],
  // ... more focused chunks
}

Lazy Loading Infrastructure

Built comprehensive lazy loading system with error boundaries:

export const LazyChart = withLazyLoading(
  () => import('@/features/dashboard/charts/chart-renderer'),
  () => <ChartSkeleton />
);

Image Optimization

Created OptimizedImage component with:

• Lazy loading with intersection observer
• Error handling and fallback images
• Loading states with accessibility
• Specialized avatar and property image variants

♿ Accessibility Enhancements

Keyboard Navigation

Enhanced keyboard navigation throughout the application:

• Skip links for main content access
• Improved focus management
• Enhanced hotkey system with screen reader announcements
• Proper ARIA roles and labels

Screen Reader Support

Added comprehensive screen reader support:

<div 
  role="status"
  aria-live="polite"
  aria-label="Loading page content"
>
  <Spinner />
  <p>Loading...</p>
</div>

Semantic Structure

Improved HTML semantics with proper landmarks:

• Main content wrapper with focus management
• Navigation with proper ARIA labels
• Loading states with accessibility attributes

📱 PWA Implementation

Manifest Configuration

Added complete PWA manifest with:

{
  "name": "Nuts Finance",
  "display": "standalone",
  "shortcuts": [
    {"name": "Dashboard", "url": "/dashboard/home"},
    {"name": "Accounts", "url": "/dashboard/accounts"}
  ]
}

Offline Support

Service worker provides offline functionality for core features.

🔧 Code Quality Improvements

TypeScript Cleanup

• Removed all unused imports and variables
• Fixed build errors and type issues
• Improved error handling patterns

TanStack Query Optimization

Enhanced query configuration:

defaultOptions: {
  queries: {
    staleTime: 1000 * 60 * 5,
    gcTime: 1000 * 60 * 10,
    networkMode: 'offlineFirst',
    retry: (failureCount, error) => {
      // Smart retry logic based on error type
    }
  }
}

📊 Performance Results

Build Output Analysis:

• Better chunk distribution with focused, cacheable chunks
• Reduced initial bundle size through lazy loading
• Optimized font loading eliminates render blocking
• Service worker provides instant loading for return visits

Before: Large monolithic bundles with blocking resources
After: Granular chunks with instant loading and progressive enhancement

🧪 Testing

All changes maintain backward compatibility and pass existing type checks. The build system now produces optimized, accessible, and performant output suitable for production deployment.

📝 Breaking Changes

None. All changes are additive and maintain existing API compatibility.

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[fnprog]

what about the backend ?