Fix React error #130 and backend event creation

Frontend fixes:
- Disable verbatimModuleSyntax in TypeScript config to fix module imports
- Add displayName to critical React components for better production debugging
- Configure Vite build with manual chunks for better code splitting
- Enable sourcemaps for production debugging

Backend fixes:
- Remove updated_at field from events table insert (column doesn't exist)
- Fix SQL error that was causing 500 errors on event creation

These changes resolve:
- React error #130 that occurred during login and event creation
- 500 Internal Server Error when creating new events
- Better error tracking in production builds

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

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

backend/src/routes/adminEvents.js

@@ -78,8 +78,7 @@ router.post('/', adminAuth, [
       color_theme,
       share_link: shareLink,
       expires_at,
-      created_at: new Date(),
-      updated_at: new Date()
+      created_at: new Date()
     });
     
     // Log activity

frontend/src/components/admin/AdminLayout.tsx

@@ -49,4 +49,6 @@ export const AdminLayout: React.FC = () => {
       </div>
     </div>
   );
-};
+};
+
+AdminLayout.displayName = 'AdminLayout';

frontend/src/pages/admin/AdminDashboard.tsx

@@ -311,4 +311,6 @@ export const AdminDashboard: React.FC = () => {
       </Card>
     </div>
   );
-};
+};
+
+AdminDashboard.displayName = 'AdminDashboard';

frontend/src/pages/admin/AdminLoginPage.tsx

@@ -210,4 +210,6 @@ export const AdminLoginPage: React.FC = () => {
       </div>
     </div>
   );
-};
+};
+
+AdminLoginPage.displayName = 'AdminLoginPage';

frontend/src/pages/admin/CreateEventPage.tsx

@@ -438,4 +438,6 @@ export const CreateEventPage: React.FC = () => {
       </form>
     </div>
   );
-};
+};
+
+CreateEventPage.displayName = 'CreateEventPage';

frontend/tsconfig.app.json

@@ -10,7 +10,7 @@
     /* Bundler mode */
     "moduleResolution": "bundler",
     "allowImportingTsExtensions": true,
-    "verbatimModuleSyntax": true,
+    "verbatimModuleSyntax": false,
     "moduleDetection": "force",
     "noEmit": true,
     "jsx": "react-jsx",

frontend/vite.config.ts

@@ -4,6 +4,17 @@ import react from '@vitejs/plugin-react'
 // https://vite.dev/config/
 export default defineConfig({
   plugins: [react()],
+  build: {
+    rollupOptions: {
+      output: {
+        manualChunks: {
+          'react-vendor': ['react', 'react-dom', 'react-router-dom'],
+          'ui-vendor': ['lucide-react', 'react-toastify'],
+        },
+      },
+    },
+    sourcemap: true,
+  },
   server: {
     port: 5173,
     host: true,