feat: remove Cache API, rework preload(), cancel() and fetch() (#25289)

* feat: remove Cache API, rework preload(), cancel() and fetch()

perf - replace broadcast channel with direct postMessage

* remove sw response handling

* review comments

web/src/lib/utils/sw-messaging.ts

@@ -1,14 +1,12 @@
-const broadcast = new BroadcastChannel('immich');
+import { ServiceWorkerMessenger } from './sw-messenger';
+
+const hasServiceWorker = globalThis.isSecureContext && 'serviceWorker' in navigator;
+// eslint-disable-next-line compat/compat
+const messenger = hasServiceWorker ? new ServiceWorkerMessenger(navigator.serviceWorker) : undefined;
 
 export function cancelImageUrl(url: string | undefined | null) {
-  if (!url) {
+  if (!url || !messenger) {
     return;
   }
-  broadcast.postMessage({ type: 'cancel', url });
-}
-export function preloadImageUrl(url: string | undefined | null) {
-  if (!url) {
-    return;
-  }
-  broadcast.postMessage({ type: 'preload', url });
+  messenger.send('cancel', { url });
 }

web/src/lib/utils/sw-messenger.ts

@@ -0,0 +1,17 @@
+export class ServiceWorkerMessenger {
+  readonly #serviceWorker: ServiceWorkerContainer;
+
+  constructor(serviceWorker: ServiceWorkerContainer) {
+    this.#serviceWorker = serviceWorker;
+  }
+
+  /**
+   * Send a one-way message to the service worker.
+   */
+  send(type: string, data: Record<string, unknown>) {
+    this.#serviceWorker.controller?.postMessage({
+      type,
+      ...data,
+    });
+  }
+}