feat: Implement comprehensive error handling and production deployment pipeline

## Error Handling System
- Add centralized error handling utilities (errorHandler.ts)
- Create reusable error components (ErrorMessage, ErrorToast)
- Implement multilingual error support (preserves backend error messages in 5 languages)
- Update 15+ forms and components with consistent error handling
  - Auth forms: login, register, forgot-password
  - Family management: family page, join family dialog
  - Child management: child dialog
  - All tracking forms: feeding, sleep, diaper, medicine, growth, activity

## Production Build Fixes
- Fix backend TypeScript errors: InviteCode.uses → InviteCode.useCount (5 instances)
- Remove non-existent savedFamily variable from registration response
- Fix admin panel TypeScript errors: SimpleMDE toolbar type, PieChart label type

## User Experience Improvements
- Auto-uppercase invite code and share code inputs
- Visual feedback for case conversion with helper text
- Improved form validation with error codes

## CI/CD Pipeline
- Create comprehensive production deployment checklist (PRODUCTION_DEPLOYMENT_CHECKLIST.md)
- Add automated pre-deployment check script (pre-deploy-check.sh)
  - Validates frontend, backend, and admin panel builds
  - Checks git status, branch, and sync state
  - Verifies environment files and migrations
- Add quick start deployment guide (DEPLOYMENT_QUICK_START.md)
- Add production deployment automation template (deploy-production.sh)

## Cleanup
- Remove outdated push notifications documentation files
- Remove outdated PWA implementation plan

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

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

maternal-web/app/track/activity/page.tsx

@@ -51,6 +51,8 @@ import { useDispatch, useSelector } from 'react-redux';
 import { fetchChildren, selectChild, selectSelectedChild, childrenSelectors } from '@/store/slices/childrenSlice';
 import { AppDispatch, RootState } from '@/store/store';
 import ChildSelector from '@/components/common/ChildSelector';
+import { useErrorMessage } from '@/components/common/ErrorMessage';
+import { formatErrorMessage } from '@/lib/utils/errorHandler';
 
 interface ActivityData {
   activityType: string;
@@ -83,7 +85,7 @@ function ActivityTrackPage() {
   const [recentActivities, setRecentActivities] = useState<Activity[]>([]);
   const [loading, setLoading] = useState(false);
   const [activitiesLoading, setActivitiesLoading] = useState(false);
-  const [error, setError] = useState<string | null>(null);
+  const { error, showError, clearError, hasError } = useErrorMessage();
   const [successMessage, setSuccessMessage] = useState<string | null>(null);
 
   // Delete confirmation dialog
@@ -131,19 +133,19 @@ function ActivityTrackPage() {
 
   const handleSubmit = async () => {
     if (!selectedChild?.id) {
-      setError('Please select a child');
+      showError({ message: 'Please select a child', code: 'NO_CHILD_SELECTED' });
       return;
     }
 
     // Validation
     if (!activityType) {
-      setError('Please select activity type');
+      showError({ message: 'Please select activity type', code: 'VALIDATION_ERROR' });
       return;
     }
 
     try {
       setLoading(true);
-      setError(null);
+      clearError();
 
       const data: ActivityData = {
         activityType,
@@ -167,7 +169,7 @@ function ActivityTrackPage() {
       await loadRecentActivities();
     } catch (err: any) {
       console.error('Failed to save activity:', err);
-      setError(err.response?.data?.message || 'Failed to save activity');
+      showError(err);
     } finally {
       setLoading(false);
     }
@@ -197,7 +199,7 @@ function ActivityTrackPage() {
       await loadRecentActivities();
     } catch (err: any) {
       console.error('Failed to delete activity:', err);
-      setError(err.response?.data?.message || 'Failed to delete activity');
+      showError(err);
     } finally {
       setLoading(false);
     }
@@ -306,9 +308,9 @@ function ActivityTrackPage() {
             />
           </Box>
 
-          {error && (
-            <Alert severity="error" sx={{ mb: 3 }} onClose={() => setError(null)}>
-              {error}
+          {hasError && (
+            <Alert severity="error" sx={{ mb: 3 }} onClose={clearError}>
+              {formatErrorMessage(error)}
             </Alert>
           )}