feat: Complete Phase 4 to 100% - All forms now have consistent error handling

Updated 4 additional pages to reach 100% Phase 4 completion:

1. Reset Password Page (auth/reset-password)
   - Added extractError() for password reset failures
   - Improved error messaging for expired tokens

2. Children Page (children/page)
   - Updated fetch, save, and delete operations
   - All 3 error handlers now use extractError()

3. Analytics Page (analytics/page)
   - Updated children loading, insights, and predictions
   - All 3 API calls now have consistent error handling

4. Advanced Analytics Page (analytics/advanced/page)
   - Updated 6 error handlers (children, circadian, anomalies, growth, correlations, trends)
   - Consistent error extraction across all analytics features

Phase 4 Status: 100% COMPLETE ✅
- Total forms updated: 21/21 (100%)
- Auth forms: 4/4 ✅
- Family & child management: 3/3 ✅
- Activity tracking: 6/6 ✅
- Settings & onboarding: 2/2 ✅
- Analytics & children pages: 4/4 ✅ (NEW)
- Other pages: 2/2 ✅ (PhotoUpload, components)

Error Improvement Plan: ~90% complete
- Phase 1-4: 100% ✅
- Phase 5-6: Backend improvements (pending)

All frontend forms now use centralized error handling with user-friendly,
multilingual error messages from the errorHandler utility.

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

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

maternal-web/app/children/page.tsx

@@ -27,6 +27,7 @@ import { motion } from 'framer-motion';
 import { useTranslation } from '@/hooks/useTranslation';
 import { useLocalizedDate } from '@/hooks/useLocalizedDate';
 import { useSelectedFamily } from '@/hooks/useSelectedFamily';
+import { extractError } from '@/lib/utils/errorHandler';
 
 export default function ChildrenPage() {
   const { t } = useTranslation('children');
@@ -66,7 +67,8 @@ export default function ChildrenPage() {
       setChildren(data);
     } catch (err: any) {
       console.error('Failed to fetch children:', err);
-      setError(err.response?.data?.message || t('errors.loadFailed'));
+      const errorData = extractError(err);
+      setError(errorData.userMessage || errorData.message);
     } finally {
       setLoading(false);
     }
@@ -103,7 +105,8 @@ export default function ChildrenPage() {
       setDialogOpen(false);
     } catch (err: any) {
       console.error('Failed to save child:', err);
-      throw new Error(err.response?.data?.message || t('errors.saveFailed'));
+      const errorData = extractError(err);
+      throw new Error(errorData.userMessage || errorData.message);
     } finally {
       setActionLoading(false);
     }
@@ -120,7 +123,8 @@ export default function ChildrenPage() {
       setChildToDelete(null);
     } catch (err: any) {
       console.error('Failed to delete child:', err);
-      setError(err.response?.data?.message || t('errors.deleteFailed'));
+      const errorData = extractError(err);
+      setError(errorData.userMessage || errorData.message);
     } finally {
       setActionLoading(false);
     }