Add PWA support for iOS home screen install

- Web app manifest (standalone display, NOMAD branding, icons)
- Service worker with Workbox caching (map tiles, API, uploads, CDN)
- SVG app icon + PNG generation script via sharp
- Apple meta tags (web-app-capable, black-translucent status bar)
- Dynamic theme-color for dark/light mode
- Safe area insets for notch devices

client/vite.config.js

@@ -1,8 +1,91 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
+import { VitePWA } from 'vite-plugin-pwa'
 
 export default defineConfig({
-  plugins: [react()],
+  plugins: [
+    react(),
+    VitePWA({
+      registerType: 'autoUpdate',
+      workbox: {
+        globPatterns: ['**/*.{js,css,html,svg,png,woff,woff2,ttf}'],
+        navigateFallback: 'index.html',
+        navigateFallbackDenylist: [/^\/api/, /^\/uploads/],
+        runtimeCaching: [
+          {
+            // Carto map tiles (default provider)
+            urlPattern: /^https:\/\/[a-d]\.basemaps\.cartocdn\.com\/.*/i,
+            handler: 'CacheFirst',
+            options: {
+              cacheName: 'map-tiles',
+              expiration: { maxEntries: 1000, maxAgeSeconds: 30 * 24 * 60 * 60 },
+              cacheableResponse: { statuses: [0, 200] },
+            },
+          },
+          {
+            // OpenStreetMap tiles (fallback / alternative)
+            urlPattern: /^https:\/\/[a-c]\.tile\.openstreetmap\.org\/.*/i,
+            handler: 'CacheFirst',
+            options: {
+              cacheName: 'map-tiles',
+              expiration: { maxEntries: 1000, maxAgeSeconds: 30 * 24 * 60 * 60 },
+              cacheableResponse: { statuses: [0, 200] },
+            },
+          },
+          {
+            // Leaflet CSS/JS from unpkg CDN
+            urlPattern: /^https:\/\/unpkg\.com\/.*/i,
+            handler: 'CacheFirst',
+            options: {
+              cacheName: 'cdn-libs',
+              expiration: { maxEntries: 30, maxAgeSeconds: 365 * 24 * 60 * 60 },
+              cacheableResponse: { statuses: [0, 200] },
+            },
+          },
+          {
+            // API calls — prefer network, fall back to cache
+            urlPattern: /\/api\/.*/i,
+            handler: 'NetworkFirst',
+            options: {
+              cacheName: 'api-data',
+              expiration: { maxEntries: 200, maxAgeSeconds: 24 * 60 * 60 },
+              networkTimeoutSeconds: 5,
+              cacheableResponse: { statuses: [0, 200] },
+            },
+          },
+          {
+            // Uploaded files (photos, covers, documents)
+            urlPattern: /\/uploads\/.*/i,
+            handler: 'CacheFirst',
+            options: {
+              cacheName: 'user-uploads',
+              expiration: { maxEntries: 300, maxAgeSeconds: 30 * 24 * 60 * 60 },
+              cacheableResponse: { statuses: [0, 200] },
+            },
+          },
+        ],
+      },
+      manifest: {
+        name: 'NOMAD \u2014 Travel Planner',
+        short_name: 'NOMAD',
+        description: 'Navigation Organizer for Maps, Activities & Destinations',
+        theme_color: '#111827',
+        background_color: '#0f172a',
+        display: 'standalone',
+        scope: '/',
+        start_url: '/',
+        orientation: 'any',
+        categories: ['travel', 'navigation'],
+        icons: [
+          { src: 'icons/apple-touch-icon-180x180.png', sizes: '180x180', type: 'image/png' },
+          { src: 'icons/icon-192x192.png', sizes: '192x192', type: 'image/png' },
+          { src: 'icons/icon-512x512.png', sizes: '512x512', type: 'image/png' },
+          { src: 'icons/icon-512x512.png', sizes: '512x512', type: 'image/png', purpose: 'maskable' },
+          { src: 'icons/icon.svg', sizes: 'any', type: 'image/svg+xml' },
+        ],
+      },
+    }),
+  ],
   server: {
     port: 5173,
     proxy: {