feat: Unify insights and predictions in /insights page with tabs

Changes:
- Created UnifiedInsightsDashboard component with 2 tabs
- Tab 1: Insights - Shows existing charts, stats, and recent activities
- Tab 2: Predictions - Shows AI-powered predictions for next activities
- Growth Spurt Alert appears at the top when detected
- Child selector for families with multiple children
- Clean tab navigation with Timeline and TrendingUp icons

Features Now Accessible from /insights:
✅ Growth Spurt Detection (appears as alert banner)
✅ Pattern Analysis (feeding, sleep, diaper trends)
✅ AI Predictions (next feeding time, sleep duration, etc.)
✅ Charts and visualizations
✅ Recent activities timeline

User Experience:
- Single page access from bottom navigation (Insights icon)
- No need for separate /analytics page
- All smart AI features visible in one place
- Tab switching for different views

Files Changed:
- app/insights/page.tsx - Updated to use UnifiedInsightsDashboard
- components/features/analytics/UnifiedInsightsDashboard.tsx (new)
  * Manages state for both tabs
  * Loads insights and predictions data
  * Renders Growth Spurt Alert
  * Tab navigation UI

🎯 Result: Users can now easily see all AI insights and predictions
from the Insights menu item in bottom navigation!

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

maternal-web/app/insights/page.tsx

@@ -5,10 +5,10 @@ import { AppShell } from '@/components/layouts/AppShell/AppShell';
 import { ProtectedRoute } from '@/components/common/ProtectedRoute';
 import { LoadingFallback } from '@/components/common/LoadingFallback';
 
-// Lazy load the insights dashboard component
-const InsightsDashboard = lazy(() =>
-  import('@/components/features/analytics/InsightsDashboard').then((mod) => ({
-    default: mod.InsightsDashboard,
+// Lazy load the unified insights dashboard component with tabs
+const UnifiedInsightsDashboard = lazy(() =>
+  import('@/components/features/analytics/UnifiedInsightsDashboard').then((mod) => ({
+    default: mod.UnifiedInsightsDashboard,
   }))
 );
 
@@ -17,7 +17,7 @@ export default function InsightsPage() {
     <ProtectedRoute>
       <AppShell>
         <Suspense fallback={<LoadingFallback variant="page" />}>
-          <InsightsDashboard />
+          <UnifiedInsightsDashboard />
         </Suspense>
       </AppShell>
     </ProtectedRoute>