Add backend with analytics, notifications, and enhanced features

Backend:
- Complete NestJS backend implementation with comprehensive features
- Analytics: Weekly/monthly reports with PDF/CSV export
- Smart notifications: Persistent notifications with milestones and anomaly detection
- AI safety: Medical disclaimer triggers and prompt injection protection
- COPPA/GDPR compliance: Full audit logging system

Frontend:
- Updated settings page and analytics components
- API integration improvements

Docs:
- Added implementation gaps tracking
- Azure OpenAI integration documentation
- Testing and post-launch summaries

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

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

maternal-web/app/settings/page.tsx

@@ -3,7 +3,7 @@
 import { Box, Typography, Card, CardContent, TextField, Button, Divider, Switch, FormControlLabel, Alert, CircularProgress, Snackbar } from '@mui/material';
 import { Save, Logout } from '@mui/icons-material';
 import { useAuth } from '@/lib/auth/AuthContext';
-import { useState } from 'react';
+import { useState, useEffect } from 'react';
 import { AppShell } from '@/components/layouts/AppShell/AppShell';
 import { ProtectedRoute } from '@/components/common/ProtectedRoute';
 import { usersApi } from '@/lib/api/users';
@@ -22,6 +22,24 @@ export default function SettingsPage() {
   const [successMessage, setSuccessMessage] = useState<string | null>(null);
   const [nameError, setNameError] = useState<string | null>(null);
 
+  // Load preferences from user object when it changes
+  useEffect(() => {
+    if (user?.preferences) {
+      setSettings({
+        notifications: user.preferences.notifications ?? true,
+        emailUpdates: user.preferences.emailUpdates ?? false,
+        darkMode: user.preferences.darkMode ?? false,
+      });
+    }
+  }, [user?.preferences]);
+
+  // Sync name state when user data changes
+  useEffect(() => {
+    if (user?.name) {
+      setName(user.name);
+    }
+  }, [user]);
+
   const handleSave = async () => {
     // Validate name
     if (!name || name.trim() === '') {
@@ -34,12 +52,20 @@ export default function SettingsPage() {
     setNameError(null);
 
     try {
-      await usersApi.updateProfile({ name: name.trim() });
+      const response = await usersApi.updateProfile({
+        name: name.trim(),
+        preferences: settings
+      });
+      console.log('✅ Profile updated successfully:', response);
+
+      // Refresh user to get latest data from server
       await refreshUser();
+
       setSuccessMessage('Profile updated successfully!');
     } catch (err: any) {
-      console.error('Failed to update profile:', err);
-      setError(err.response?.data?.message || 'Failed to update profile. Please try again.');
+      console.error('❌ Failed to update profile:', err);
+      console.error('Error response:', err.response);
+      setError(err.response?.data?.message || err.message || 'Failed to update profile. Please try again.');
     } finally {
       setIsLoading(false);
     }
@@ -129,15 +155,13 @@ export default function SettingsPage() {
             <Typography variant="h6" fontWeight="600" gutterBottom>
               Notifications
             </Typography>
-            <Typography variant="body2" color="text.secondary" sx={{ mb: 2 }}>
-              Settings are stored locally (backend integration coming soon)
-            </Typography>
             <Box sx={{ display: 'flex', flexDirection: 'column', gap: 1, mt: 2 }}>
               <FormControlLabel
                 control={
                   <Switch
                     checked={settings.notifications}
                     onChange={(e) => setSettings({ ...settings, notifications: e.target.checked })}
+                    disabled={isLoading}
                   />
                 }
                 label="Push Notifications"
@@ -147,11 +171,21 @@ export default function SettingsPage() {
                   <Switch
                     checked={settings.emailUpdates}
                     onChange={(e) => setSettings({ ...settings, emailUpdates: e.target.checked })}
+                    disabled={isLoading}
                   />
                 }
                 label="Email Updates"
               />
             </Box>
+            <Button
+              variant="contained"
+              startIcon={isLoading ? <CircularProgress size={20} color="inherit" /> : <Save />}
+              onClick={handleSave}
+              disabled={isLoading}
+              sx={{ mt: 2, alignSelf: 'flex-start' }}
+            >
+              {isLoading ? 'Saving...' : 'Save Preferences'}
+            </Button>
           </CardContent>
         </Card>
       </motion.div>