Add PWA mobile attendance shortcut

app/ui/static/pwa/sw.js

@@ -0,0 +1,42 @@
+const CACHE_VERSION = 'arrr-erp-pwa-v1';
+const CORE_ASSETS = [
+  '/manifest.webmanifest',
+  '/static/css/theme_tokens.css',
+  '/static/pwa/icons/icon-192.png',
+  '/static/pwa/icons/icon-512.png'
+];
+
+self.addEventListener('install', (event) => {
+  event.waitUntil(
+    caches.open(CACHE_VERSION).then((cache) => cache.addAll(CORE_ASSETS)).catch(() => undefined)
+  );
+  self.skipWaiting();
+});
+
+self.addEventListener('activate', (event) => {
+  event.waitUntil(
+    caches.keys().then((keys) => Promise.all(keys.filter((key) => key !== CACHE_VERSION).map((key) => caches.delete(key))))
+  );
+  self.clients.claim();
+});
+
+self.addEventListener('fetch', (event) => {
+  const request = event.request;
+  if (request.method !== 'GET') return;
+
+  const url = new URL(request.url);
+  if (url.origin !== self.location.origin) return;
+
+  if (url.pathname.startsWith('/static/')) {
+    event.respondWith(
+      caches.match(request).then((cached) => cached || fetch(request).then((response) => {
+        const copy = response.clone();
+        caches.open(CACHE_VERSION).then((cache) => cache.put(request, copy)).catch(() => undefined);
+        return response;
+      }))
+    );
+    return;
+  }
+
+  event.respondWith(fetch(request).catch(() => caches.match('/static/css/theme_tokens.css')));
+});