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- Remove outdated push notifications documentation files
- Remove outdated PWA implementation plan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/components/children/ChildDialog.tsx

@@ -15,6 +15,8 @@ import {
 import { Child, CreateChildData } from '@/lib/api/children';
 import { useTranslation } from '@/hooks/useTranslation';
 import { PhotoUpload } from '@/components/common/PhotoUpload';
+import { useErrorMessage } from '@/components/common/ErrorMessage';
+import { formatErrorMessage } from '@/lib/utils/errorHandler';
 
 interface ChildDialogProps {
   open: boolean;
@@ -33,7 +35,7 @@ export function ChildDialog({ open, onClose, onSubmit, child, isLoading = false
     photoUrl: '',
     photoAlt: '',
   });
-  const [error, setError] = useState<string>('');
+  const { error, showError, clearError, hasError } = useErrorMessage();
 
   useEffect(() => {
     if (child) {
@@ -53,8 +55,8 @@ export function ChildDialog({ open, onClose, onSubmit, child, isLoading = false
         photoAlt: '',
       });
     }
-    setError('');
-  }, [child, open]);
+    clearError();
+  }, [child, open, clearError]);
 
   const handleChange = (field: keyof CreateChildData) => (
     e: React.ChangeEvent<HTMLInputElement>
@@ -63,15 +65,15 @@ export function ChildDialog({ open, onClose, onSubmit, child, isLoading = false
   };
 
   const handleSubmit = async () => {
-    setError('');
+    clearError();
 
     // Validation
     if (!formData.name.trim()) {
-      setError(t('dialog.validation.nameRequired'));
+      showError({ message: t('dialog.validation.nameRequired'), code: 'VALIDATION_NAME_REQUIRED' });
       return;
     }
     if (!formData.birthDate) {
-      setError(t('dialog.validation.birthDateRequired'));
+      showError({ message: t('dialog.validation.birthDateRequired'), code: 'VALIDATION_BIRTHDATE_REQUIRED' });
       return;
     }
 
@@ -80,7 +82,7 @@ export function ChildDialog({ open, onClose, onSubmit, child, isLoading = false
     const today = new Date();
     today.setHours(0, 0, 0, 0);
     if (selectedDate > today) {
-      setError(t('dialog.validation.birthDateFuture'));
+      showError({ message: t('dialog.validation.birthDateFuture'), code: 'VALIDATION_BIRTHDATE_FUTURE' });
       return;
     }
 
@@ -88,7 +90,7 @@ export function ChildDialog({ open, onClose, onSubmit, child, isLoading = false
       await onSubmit(formData);
       onClose();
     } catch (err: any) {
-      setError(err.message || t('errors.saveFailed'));
+      showError(err);
     }
   };
 
@@ -107,9 +109,9 @@ export function ChildDialog({ open, onClose, onSubmit, child, isLoading = false
           id="child-dialog-description"
           sx={{ pt: 2, display: 'flex', flexDirection: 'column', gap: 2 }}
         >
-          {error && (
-            <Alert severity="error" onClose={() => setError('')} role="alert">
-              {error}
+          {hasError && (
+            <Alert severity="error" onClose={clearError} role="alert">
+              {formatErrorMessage(error)}
             </Alert>
           )}