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- Remove outdated push notifications documentation files
- Remove outdated PWA implementation plan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/(auth)/register/page.tsx

@@ -24,6 +24,8 @@ import { useAuth } from '@/lib/auth/AuthContext';
 import Link from 'next/link';
 import { useTheme } from '@mui/material/styles';
 import apiClient from '@/lib/api/client';
+import { useErrorMessage } from '@/components/common/ErrorMessage';
+import { formatErrorMessage } from '@/lib/utils/errorHandler';
 
 // Create a function to generate schema dynamically based on requireInviteCode
 const createRegisterSchema = (requireInviteCode: boolean) => z.object({
@@ -79,7 +81,7 @@ export default function RegisterPage() {
   const theme = useTheme();
   const [showPassword, setShowPassword] = useState(false);
   const [showConfirmPassword, setShowConfirmPassword] = useState(false);
-  const [error, setError] = useState<string | null>(null);
+  const { error, showError, clearError, hasError } = useErrorMessage();
   const [isLoading, setIsLoading] = useState(false);
   const [userAge, setUserAge] = useState<number | null>(null);
   const [requiresParentalConsent, setRequiresParentalConsent] = useState(false);
@@ -150,11 +152,11 @@ export default function RegisterPage() {
   }, [dateOfBirth]);
 
   const onSubmit = async (data: RegisterFormData) => {
-    setError(null);
+    clearError();
 
     // Validate invite code if required
     if (requireInviteCode && (!data.inviteCode || data.inviteCode.trim() === '')) {
-      setError('Invite code is required to register');
+      showError({ message: 'Invite code is required to register', code: 'VALIDATION_INVITE_CODE_REQUIRED' });
       return;
     }
 
@@ -172,7 +174,7 @@ export default function RegisterPage() {
       });
       // Navigation to onboarding is handled in the register function
     } catch (err: any) {
-      setError(err.message || 'Failed to register. Please try again.');
+      showError(err);
     } finally {
       setIsLoading(false);
     }
@@ -224,9 +226,9 @@ export default function RegisterPage() {
             Start your journey to organized parenting
           </Typography>
 
-          {error && (
-            <Alert severity="error" sx={{ mb: 3, borderRadius: 2 }}>
-              {error}
+          {hasError && (
+            <Alert severity="error" sx={{ mb: 3, borderRadius: 2 }} onClose={clearError}>
+              {formatErrorMessage(error)}
             </Alert>
           )}
 
@@ -285,14 +287,21 @@ export default function RegisterPage() {
                 label="Invite Code"
                 margin="normal"
                 error={!!errors.inviteCode}
-                helperText={errors.inviteCode?.message || 'Enter your invite code to register'}
-                {...register('inviteCode')}
+                helperText={errors.inviteCode?.message || 'Invite codes are automatically converted to uppercase'}
+                {...register('inviteCode', {
+                  setValueAs: (value) => value?.toUpperCase() || '',
+                })}
+                onChange={(e) => {
+                  const uppercased = e.target.value.toUpperCase();
+                  setValue('inviteCode', uppercased);
+                }}
                 disabled={isLoading}
                 required
                 inputProps={{
                   'aria-required': 'true',
                   'aria-invalid': !!errors.inviteCode,
                   'aria-describedby': errors.inviteCode ? 'invite-code-error' : 'invite-code-helper',
+                  style: { textTransform: 'uppercase' },
                 }}
                 InputProps={{
                   sx: { borderRadius: 3 },