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- Remove outdated push notifications documentation files
- Remove outdated PWA implementation plan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>

parentflow-admin/src/app/legal-pages/[id]/edit/page.tsx

@@ -142,7 +142,7 @@ export default function EditLegalPagePage() {
         'fullscreen',
         '|',
         'guide',
-      ],
+      ] as const,
     };
   }, []);
 

parentflow-admin/src/app/page.tsx

@@ -261,7 +261,7 @@ export default function DashboardPage() {
                   cx="50%"
                   cy="50%"
                   labelLine={false}
-                  label={({ name, percent }) => `${name} ${(percent * 100).toFixed(0)}%`}
+                  label={(props: any) => `${props.name} ${(props.percent * 100).toFixed(0)}%`}
                   outerRadius={80}
                   fill="#8884d8"
                   dataKey="value"