Stop caching shortcut icons - that is down to the OS.

src/routes/+layout.svelte

@@ -21,7 +21,7 @@
     <meta name="author" content="Frederick Boniface" />
     <meta
         name="description"
-        content="Get instant access to live train data, PIS codes, and location reference codes. Built by railway staff, for railway staff – your fastest route to accurate information."
+        content="Get instant access to live train data, PIS codes, and location reference codes. Built by railway staff, for railway staff - your fastest route to accurate information."
     />
     <meta name="viewport" content="width=device-width" />
     <meta name="theme-color" content="#00b7b7" />

src/service-worker.js

@@ -7,8 +7,10 @@ const cacheName = `ob-${version}`;
 const assets = [...build, ...files, "/service-worker.js"];
 
 const excludePatterns = [
-    "/static/images/screnshots/",
+    "/static/images/screnshots",
     "/images/screenshots",
+    "/static/images/shortcuts",
+    "/images/shortcuts",
 ];
 
 self.addEventListener("install", (event) => {