Phase 9: PWA & Workbox Caching

- Added vite-plugin-pwa and workbox-window dependencies
- PWA manifest with icons and standalone display mode
- Workbox runtime caching for:
  - Transformers.js models (30 days)
  - Uploaded images (7 days)
  - Google Fonts (1 year)
- PWAInstall component with install prompt banner
- Offline support for cached assets
- Auto-update registration

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/vite.config.js

@@ -1,16 +1,111 @@
-import { defineConfig } from 'vite'
-import react from '@vitejs/plugin-react'
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+import { VitePWA } from 'vite-plugin-pwa';
 
-// https://vite.dev/config/
 export default defineConfig({
-  plugins: [react()],
+  plugins: [
+    react(),
+    VitePWA({
+      registerType: 'autoUpdate',
+      includeAssets: ['favicon.ico', 'apple-touch-icon.png', 'masked-icon.svg'],
+      manifest: {
+        name: 'Apparel Designer',
+        short_name: 'ApparelDesigner',
+        description: 'T-shirt customization editor',
+        theme_color: '#ffffff',
+        background_color: '#ffffff',
+        display: 'standalone',
+        orientation: 'any',
+        scope: '/',
+        start_url: '/',
+        icons: [
+          {
+            src: 'pwa-192x192.png',
+            sizes: '192x192',
+            type: 'image/png',
+          },
+          {
+            src: 'pwa-512x512.png',
+            sizes: '512x512',
+            type: 'image/png',
+          },
+          {
+            src: 'pwa-512x512.png',
+            sizes: '512x512',
+            type: 'image/png',
+            purpose: 'any maskable',
+          },
+        ],
+      },
+      workbox: {
+        globPatterns: ['**/*.{js,css,html,ico,png,svg,woff2}'],
+        runtimeCaching: [
+          {
+            urlPattern: /^https:\/\/cdn\.huggingface\.co\/.*/i,
+            handler: 'CacheFirst',
+            options: {
+              cacheName: 'transformers-models',
+              expiration: {
+                maxEntries: 10,
+                maxAgeSeconds: 60 * 60 * 24 * 30,
+              },
+              cacheableResponse: {
+                statuses: [0, 200],
+              },
+            },
+          },
+          {
+            urlPattern: /^\/api\/uploads\/.*/i,
+            handler: 'CacheFirst',
+            options: {
+              cacheName: 'uploaded-images',
+              expiration: {
+                maxEntries: 50,
+                maxAgeSeconds: 60 * 60 * 24 * 7,
+              },
+            },
+          },
+          {
+            urlPattern: /^https:\/\/fonts\.googleapis\.com\/.*/i,
+            handler: 'StaleWhileRevalidate',
+            options: {
+              cacheName: 'google-fonts',
+              expiration: {
+                maxEntries: 10,
+                maxAgeSeconds: 60 * 60 * 24 * 365,
+              },
+            },
+          },
+          {
+            urlPattern: /^https:\/\/fonts\.gstatic\.com\/.*/i,
+            handler: 'CacheFirst',
+            options: {
+              cacheName: 'gstatic-fonts',
+              expiration: {
+                maxEntries: 10,
+                maxAgeSeconds: 60 * 60 * 24 * 365,
+              },
+            },
+          },
+        ],
+      },
+    }),
+  ],
   server: {
     port: 3000,
     proxy: {
       '/api': {
         target: 'http://localhost:3001',
-        changeOrigin: true
-      }
-    }
-  }
-})
+        changeOrigin: true,
+      },
+      '/uploads': {
+        target: 'http://localhost:3001',
+        changeOrigin: true,
+      },
+      '/exports': {
+        target: 'http://localhost:3001',
+        changeOrigin: true,
+      },
+    },
+  },
+});