fix(gui): the service worker never reuses cached imports

The worker is registered with updateViaCache set to none, so the scripts
it imports are fetched fresh on every update check.

src/gui/src/helpers/pushWorker.js

@@ -157,7 +157,8 @@ export const startPushWorker = async ({
         dispatchPushTap(event.data.notification);
     });
     try {
-        await nav.serviceWorker.register(WORKER_URL, { scope: '/' });
+        // Scripts the worker imports are fetched fresh on each update check.
+        await nav.serviceWorker.register(WORKER_URL, { scope: '/', updateViaCache: 'none' });
     } catch ( err ) {
         console.warn('Could not register the service worker:', err);
     }

src/gui/src/helpers/pushWorker.test.js

@@ -217,7 +217,7 @@ describe('startPushWorker', () => {
         mod.setPushTapHandler(handler);
         const nav = makeNav();
         await start(mod, { nav });
-        expect(nav.serviceWorker.register).toHaveBeenCalledWith('/sw.js', { scope: '/' });
+        expect(nav.serviceWorker.register).toHaveBeenCalledWith('/sw.js', { scope: '/', updateViaCache: 'none' });
 
         const source = { postMessage: vi.fn() };
         nav.listeners.message({ data: { type: 'other', notification: { uid: UID } }, source });