[code] created app.js and service-worker.js, these files are key for offline and PWA functionality, also updated all project HTML files to reflect these new files and their relevant links.

service-worker.js

@@ -0,0 +1,40 @@
+// This was created/generated by Claude AI LLM there may be errors present.
+
+const CACHE_NAME = 'sentinel-v1';
+const ASSETS = [
+  '/',
+  '/html/home.html',
+  '/html/login.html',
+  '/html/transport.html',
+  '/app.js',
+  '/manifest.json',
+  '/css/styles.css',
+  '/css/loader.css',
+  '/assets/icons/favicon.ico',
+  '/assets/images/sentinelLogo.png',
+];
+
+// Install — cache your core assets
+self.addEventListener('install', event => {
+  event.waitUntil(
+    caches.open(CACHE_NAME).then(cache => cache.addAll(ASSETS))
+  );
+});
+
+// Activate — clean up old caches
+self.addEventListener('activate', event => {
+  event.waitUntil(
+    caches.keys().then(keys =>
+      Promise.all(
+        keys.filter(key => key !== CACHE_NAME).map(key => caches.delete(key))
+      )
+    )
+  );
+});
+
+// Fetch — serve from cache, fall back to network
+self.addEventListener('fetch', event => {
+  event.respondWith(
+    caches.match(event.request).then(cached => cached || fetch(event.request))
+  );
+});