Start at the factory, add PWA install and GPS real-world mode

The game now begins inside the Negin Sazan Pishgam Radmehr Atousa
vending-machine factory on the Mashhad–Chenaran road, and the world
extends ~20 km along the real driving route to Park Mellat and
Ferdowsi University.

- Factory compound: production hall with assembly line, office, yard,
  gate and company signs; first mission at its half-price demo machine
- Map data merged from four OSM extracts (factory zone, route corridor,
  region main roads, city zone), clipped to a 15 x 18 km region
- City meshes chunked and culled by distance; traffic recycled around
  the player; minimap and city map drawn from cached tiles + overview
- The Robot Market robot no longer walks with the family: it comes out
  of a machine when they arrive, greets them with expression portraits
  and goes back inside when they leave
- PWA: manifest, icons from the robot avatar, offline service worker
  generated at build time, install button / iOS steps, update prompt;
  Vazirmatn font bundled instead of Google Fonts
- Real-world mode: safety notice, GPS + compass tracking with accuracy
  smoothing, 20-40 m arrival radius, speed lock and in-person bonus

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

vite.config.js

@@ -1,8 +1,51 @@
 import {defineConfig} from 'vite';
+import {readdirSync, statSync} from 'node:fs';
+import {join, relative} from 'node:path';
+import {createHash} from 'node:crypto';
+
+const listFiles = dir => readdirSync(dir).flatMap(name => {
+    const path = join(dir, name);
+    return statSync(path).isDirectory() ? listFiles(path) : [path];
+});
+
+// Emits sw.js listing every built file, so the installed game works offline. The cache name is a
+// hash of that list: a new build gets a new cache and the page offers to reload into it.
+function offlineServiceWorker() {
+    return {
+        name: 'offline-service-worker',
+        apply: 'build',
+        generateBundle(_, bundle) {
+            const files = [...Object.keys(bundle), ...listFiles('public').map(f => relative('public', f).replaceAll('\\', '/'))]
+                .filter(f => f !== 'sw.js' && !f.endsWith('.map'));
+            const version = createHash('sha1').update(files.join('\n')).digest('hex').slice(0, 12);
+            this.emitFile({
+                type: 'asset', fileName: 'sw.js', source: `// Generated by vite.config.js — do not edit.
+const CACHE = 'robot-market-${version}';
+const FILES = ${JSON.stringify(['./', ...files.map(f => `./${f}`)])};
+self.addEventListener('install', event => event.waitUntil(caches.open(CACHE).then(cache => cache.addAll(FILES))));
+self.addEventListener('activate', event => event.waitUntil(caches.keys().then(keys =>
+    Promise.all(keys.filter(k => k.startsWith('robot-market-') && k !== CACHE).map(k => caches.delete(k)))).then(() => self.clients.claim())));
+self.addEventListener('message', event => event.data === 'skip-waiting' && self.skipWaiting());
+self.addEventListener('fetch', event => {
+    const request = event.request;
+    if (request.method !== 'GET' || new URL(request.url).origin !== location.origin) return;
+    // Pages: network first so updates arrive, cached page when offline. Everything else: cache first.
+    if (request.mode === 'navigate') {
+        event.respondWith(fetch(request).catch(() => caches.match('./')));
+        return;
+    }
+    event.respondWith(caches.match(request, {ignoreSearch: true}).then(hit => hit ?? fetch(request)));
+});
+`
+            });
+        }
+    };
+}
 
 export default defineConfig({
     // Relative assets also load under a GitHub Pages repository path.
     base: './',
+    plugins: [offlineServiceWorker()],
     server: {
         host: true,
         allowedHosts: [