Enable service worker for Safari

For future reference: the preflight request must return these headers:
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: GET, POST, HEAD, OPTIONS
Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept, Authorization, Pragma, Cache-Control

Otherwise, Safari will refuse requests made inside a service worker
reporting a preflight check fail.

common/worker.js

@@ -15,11 +15,9 @@ const registerServiceWorker = async () => {
         console.log('Service worker active');
       }
     } catch (error) {
-      console.error(`Registration failed with ${error}`);
+      console.error('Registration failed', error);
     }
   }
 };
 
-if (!/^((?!chrome|android).)*safari/i.test(navigator.userAgent)) {
-  registerServiceWorker();
-}
+registerServiceWorker();

sw.js

@@ -124,6 +124,7 @@ const cacheFirst = async ({ request, preloadResponsePromise, refreshAnyway }) =>
 	}
 
 	// Next try to use (and cache) the preloaded response, if it's there
+	try {
 		if (preloadResponsePromise) {
 			const preloadResponse = await preloadResponsePromise
 			if (preloadResponse && preloadResponse.ok) {
@@ -135,6 +136,11 @@ const cacheFirst = async ({ request, preloadResponsePromise, refreshAnyway }) =>
 				console.log('[cf] got not ok preloadResponse, ignoring', preloadResponse)
 			}
 		}
+	}
+	catch (e) {
+		// Ignore as preload isn't necessarily important
+		console.error('[cf] preload response error', e)
+	}
 
 	// Next try to get the resource from the network
 	const responseFromNetwork = await fetch(request)
@@ -153,6 +159,7 @@ const cacheFirst = async ({ request, preloadResponsePromise, refreshAnyway }) =>
 
 const networkFirst = async ({ request, preloadResponsePromise }) => {
 	// First try to use (and cache) the preloaded response, if it's there
+	try {
 		if (preloadResponsePromise) {
 			const preloadResponse = await preloadResponsePromise
 			if (preloadResponse && preloadResponse.ok) {
@@ -164,6 +171,11 @@ const networkFirst = async ({ request, preloadResponsePromise }) => {
 				console.log('[nf] got not ok preloadResponse, ignoring', preloadResponse)
 			}
 		}
+	}
+	catch (e) {
+		// Ignore as preload isn't necessarily important
+		console.error('[nf] preload response error', e)
+	}
 
 	// Next try to get the resource from the network
 	let responseFromNetwork