feat: Add advanced analytics UI components in frontend

- Add comprehensive API client methods for all advanced analytics endpoints
- Create CircadianRhythmCard component for sleep pattern visualization
- Create AnomalyAlertsPanel for anomaly detection and alerts
- Create GrowthPercentileChart with WHO/CDC percentiles
- Create CorrelationInsights for activity correlations
- Create TrendAnalysisChart with predictions
- Add advanced analytics page with all new components
- Add UI component library (shadcn/ui) setup
- Add navigation link to advanced analytics from insights page

All advanced analytics features are now accessible from the frontend UI.

maternal-web/components/layouts/TabBar/TabBar.tsx

@@ -22,7 +22,7 @@ export const TabBar = () => {
     { label: t('navigation.home'), icon: <Home />, value: '/' },
     { label: t('navigation.track'), icon: <Timeline />, value: '/track' },
     { label: '', icon: null, value: 'voice' }, // Placeholder for center button
-    { label: t('navigation.insights'), icon: <Insights />, value: '/insights' },
+    { label: t('navigation.insights'), icon: <Insights />, value: pathname.startsWith('/analytics') ? pathname : '/insights' },
     { label: t('navigation.aiChat'), icon: <Chat />, value: '/ai-assistant' },
   ];