fix: app cache and other issues (#5460)

* fixes

* #[serde(untagged)] my BEHATED (still kinda broken)

* remove unused hasContent ref

* clean up code in fetch instance

* ping 3 times for average latency

* fix: pinging to be more accurate

TCP_NODELAY — Set on the TCP stream right after connect, preventing Nagle's algorithm from buffering the small ping packet (could save up to ~40ms)

Instant over Utc::now() — Switched to monotonic std::time::Instant for timing, which is more precise and designed for measuring elapsed time (still using chrono just for the ping magic value)

* delete useFetch util and just use native fetch

* rename worlds until functions for more clarity

* fix lint

* fix cache.rs logic

* make backend ping use both impls

* Add optional timeout to server ping

* fix gallery appearing in nav with no items

* remove EU countries and add EU option for server country

* add uk to europe

---------

Co-authored-by: aecsocket <aecsocket@tutanota.com>

apps/app-frontend/src/pages/project/Index.vue

@@ -265,7 +265,7 @@ import {
 	list as listInstances,
 } from '@/helpers/profile'
 import { get_categories, get_game_versions, get_loaders } from '@/helpers/tags'
-import { get_server_status } from '@/helpers/worlds'
+import { getServerLatency } from '@/helpers/worlds'
 import { useBreadcrumbs } from '@/store/breadcrumbs'
 import {
 	getServerAddress,
@@ -398,15 +398,11 @@ async function fetchProjectData() {
 	serverStatusOnline.value = !!projectV3.value?.minecraft_java_server?.ping?.data
 	if (serverAddress) {
 		serverPing.value = undefined
-		get_server_status(serverAddress)
-			.then((status) => {
-				if (status.ping != null) {
-					serverPing.value = status.ping
-				}
-			})
-			.catch((err) => {
-				console.error(`Failed to ping server ${serverAddress}:`, err)
-			})
+		try {
+			serverPing.value = await getServerLatency(serverAddress)
+		} catch (error) {
+			console.error(`Failed to ping server ${serverAddress}:`, error)
+		}
 	}
 
 	// Fetch server sidebar data (modpack version + project)