Fix TypeScript build errors

frontend/vite.config.ts

@@ -14,6 +14,7 @@ export default defineConfig({
       '@/utils': path.resolve(__dirname, './src/utils'),
       '@/types': path.resolve(__dirname, './src/types'),
       '@/constants': path.resolve(__dirname, './src/constants'),
+      '@/config': path.resolve(__dirname, './src/config'),
     },
   },
   server: {
@@ -25,5 +26,29 @@ export default defineConfig({
       },
     },
   },
+  build: {
+    // Optimize build output
+    target: 'esnext',
+    minify: 'esbuild',
+    sourcemap: false, // Set to true for production debugging if needed
+    rollupOptions: {
+      output: {
+        // Manual code splitting for better caching
+        manualChunks: {
+          // Vendor chunks
+          'react-vendor': ['react', 'react-dom', 'react-router-dom'],
+          'query-vendor': ['@tanstack/react-query'],
+          'ui-vendor': ['recharts', 'react-icons', 'react-hot-toast'],
+          'utils-vendor': ['axios', 'zod', 'date-fns', 'clsx', 'zustand'],
+        },
+      },
+    },
+    // Chunk size warning limit (1MB)
+    chunkSizeWarningLimit: 1000,
+  },
+  // Optimize dependencies
+  optimizeDeps: {
+    include: ['react', 'react-dom', 'react-router-dom', '@tanstack/react-query'],
+  },
 });