backend and frontend: support out of order chunks + now it's performant on chrome

frontend/src/routes/Cover.svelte

@@ -23,6 +23,8 @@
 		let streamData = await getStreamData(app.id, server_name);
 		streamStore.Url = streamData.Url;
 		streamStore.CertHash = streamData.CertHash;
+		streamStore.Width = streamData.Width;
+		streamStore.Height = streamData.Height;
 
 		console.log(`Stream data retrieved. Navigating to /stream.`);
 		await goto('/stream');