Upload 2 files

static/manifest.json

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+{
+  "name": "TaskBot AI",
+  "short_name": "TaskBot",
+  "start_url": "/",
+  "display": "standalone",
+  "background_color": "#ffffff",
+  "theme_color": "#007bff",
+  "icons": [
+    {
+      "src": "/static/icon-192.png",
+      "type": "image/png",
+      "sizes": "192x192"
+    },
+    {
+      "src": "/static/icon-512.png",
+      "type": "image/png",
+      "sizes": "512x512"
+    }
+  ]
+}

static/service-worker.js

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+self.addEventListener('install', function(event) {
+  event.waitUntil(
+    caches.open('taskbot-cache').then(function(cache) {
+      return cache.addAll([
+        '/',
+        '/static/style.css',
+        '/static/script.js',
+        '/static/icon-192.png'
+      ]);
+    })
+  );
+});
+
+self.addEventListener('fetch', function(event) {
+  event.respondWith(
+    caches.match(event.request).then(function(response) {
+      return response || fetch(event.request);
+    })
+  );
+});