feat: add PWA offline testing documentation and verification (#36)

- Create comprehensive PWA_TESTING.md guide
- Add automated verify-pwa script
- Document all test categories:
  - PWA manifest & installation
  - Service worker functionality
  - Offline mode
  - Cross-platform testing
  - Performance testing
  - Storage management
- Include platform-specific test cases
- Add troubleshooting section
- Create success criteria checklist
- Verify all PWA components present

Testing script checks:
- All icon assets exist
- Screenshots present
- Nuxt config valid
- Composables available
- Components present
- Offline page exists

All automated checks pass ✅

Closes #36

app/package.json

@@ -8,7 +8,8 @@
     "generate": "nuxt generate",
     "preview": "nuxt preview",
     "postinstall": "nuxt prepare",
-    "generate:icons": "node scripts/generate-icons.js && node scripts/generate-screenshots.js"
+    "generate:icons": "node scripts/generate-icons.js && node scripts/generate-screenshots.js",
+    "verify:pwa": "node scripts/verify-pwa.js"
   },
   "dependencies": {
     "@nuxt/fonts": "^0.13.0",

app/scripts/verify-pwa.js

@@ -0,0 +1,141 @@
+#!/usr/bin/env node
+/**
+ * Verify PWA Configuration
+ * 
+ * Checks that all PWA assets and configuration are present and valid.
+ */
+import { readFile, access } from 'fs/promises';
+import { join, dirname } from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const publicDir = join(__dirname, '..', 'public');
+const configPath = join(__dirname, '..', 'nuxt.config.ts');
+
+let errors = [];
+let warnings = [];
+
+async function checkFileExists(path, description) {
+  try {
+    await access(path);
+    console.log(`✓ ${description}`);
+    return true;
+  } catch {
+    errors.push(`✗ ${description} - File not found: ${path}`);
+    return false;
+  }
+}
+
+async function verifyPWA() {
+  console.log('🔍 Verifying PWA Configuration...\n');
+
+  // Check icons
+  console.log('Icons:');
+  await checkFileExists(join(publicDir, 'icon.svg'), 'Source icon (SVG)');
+  await checkFileExists(join(publicDir, 'icon-192x192.png'), 'Icon 192x192');
+  await checkFileExists(join(publicDir, 'icon-512x512.png'), 'Icon 512x512');
+  await checkFileExists(join(publicDir, 'icon-192x192-maskable.png'), 'Maskable icon 192x192');
+  await checkFileExists(join(publicDir, 'icon-512x512-maskable.png'), 'Maskable icon 512x512');
+  await checkFileExists(join(publicDir, 'favicon.ico'), 'Favicon');
+  await checkFileExists(join(publicDir, 'apple-touch-icon.png'), 'Apple touch icon');
+
+  // Check screenshots
+  console.log('\nScreenshots:');
+  await checkFileExists(join(publicDir, 'screenshot-mobile.png'), 'Mobile screenshot');
+  await checkFileExists(join(publicDir, 'screenshot-desktop.png'), 'Desktop screenshot');
+
+  // Check Nuxt config
+  console.log('\nConfiguration:');
+  const configExists = await checkFileExists(configPath, 'Nuxt config file');
+  
+  if (configExists) {
+    const config = await readFile(configPath, 'utf-8');
+    
+    // Check for required PWA configuration
+    if (config.includes('@vite-pwa/nuxt')) {
+      console.log('✓ @vite-pwa/nuxt module configured');
+    } else {
+      errors.push('✗ @vite-pwa/nuxt module not found in config');
+    }
+
+    if (config.includes('registerType')) {
+      console.log('✓ Service worker registration configured');
+    } else {
+      warnings.push('⚠ Service worker registration type not set');
+    }
+
+    if (config.includes('manifest')) {
+      console.log('✓ PWA manifest configured');
+    } else {
+      errors.push('✗ PWA manifest configuration missing');
+    }
+
+    if (config.includes('workbox')) {
+      console.log('✓ Workbox configured');
+    } else {
+      warnings.push('⚠ Workbox configuration missing');
+    }
+
+    // Check for important manifest fields
+    if (config.includes('theme_color')) {
+      console.log('✓ Theme color configured');
+    } else {
+      warnings.push('⚠ Theme color not configured');
+    }
+
+    if (config.includes('display')) {
+      console.log('✓ Display mode configured');
+    } else {
+      warnings.push('⚠ Display mode not configured');
+    }
+  }
+
+  // Check composables
+  console.log('\nComposables:');
+  await checkFileExists(join(__dirname, '..', 'composables', 'usePWAInstall.ts'), 'usePWAInstall composable');
+  await checkFileExists(join(__dirname, '..', 'composables', 'useOnlineStatus.ts'), 'useOnlineStatus composable');
+
+  // Check components
+  console.log('\nComponents:');
+  await checkFileExists(join(__dirname, '..', 'components', 'InstallPrompt.vue'), 'InstallPrompt component');
+  await checkFileExists(join(__dirname, '..', 'components', 'OfflineBanner.vue'), 'OfflineBanner component');
+
+  // Check pages
+  console.log('\nPages:');
+  await checkFileExists(join(__dirname, '..', 'pages', 'offline.vue'), 'Offline fallback page');
+
+  // Print summary
+  console.log('\n' + '='.repeat(60));
+  
+  if (errors.length === 0 && warnings.length === 0) {
+    console.log('✅ PWA configuration is valid!');
+    console.log('\nNext steps:');
+    console.log('1. Run `npm run dev` and test in browser');
+    console.log('2. Check DevTools → Application → Manifest');
+    console.log('3. Test offline functionality');
+    console.log('4. Run Lighthouse PWA audit');
+    return 0;
+  }
+
+  if (warnings.length > 0) {
+    console.log('\n⚠️  Warnings:');
+    warnings.forEach(w => console.log(w));
+  }
+
+  if (errors.length > 0) {
+    console.log('\n❌ Errors:');
+    errors.forEach(e => console.log(e));
+    console.log('\nPWA configuration is incomplete. Please fix the errors above.');
+    return 1;
+  }
+
+  console.log('\n✅ PWA configuration is mostly valid (with warnings).');
+  return 0;
+}
+
+verifyPWA()
+  .then(code => process.exit(code))
+  .catch(error => {
+    console.error('\n❌ Verification failed:', error.message);
+    process.exit(1);
+  });