feat: Add enhanced analytics dashboard with advanced visualizations

- Created EnhancedInsightsDashboard with multiple chart types:
  - Area charts with gradients for activity trends
  - Radar chart for weekly activity patterns
  - 24-hour heatmap visualization
  - Bubble/scatter chart for correlations
  - Time of day distribution bar chart
- Added toggle between basic and enhanced chart views
- Implemented chart export functionality (PNG/PDF)
- Fixed API endpoint URLs (circadian-rhythm, query params)
- Fixed component library conflicts (shadcn/ui → MUI)
- Added comprehensive null safety for timestamp handling
- Added alert type translations in all 5 languages
- Installed html2canvas and jspdf for export features
- Applied consistent minimum width styling to all charts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

maternal-web/package.json

@@ -38,8 +38,10 @@
     "focus-trap-react": "^11.0.4",
     "framer-motion": "^12.23.22",
     "graphql": "^16.11.0",
+    "html2canvas": "^1.4.1",
     "i18next": "^25.5.3",
     "i18next-browser-languagedetector": "^8.2.0",
+    "jspdf": "^3.0.3",
     "lucide-react": "^0.544.0",
     "next": "^15.5.4",
     "next-pwa": "^5.6.0",