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/components/ui/settings/ResourceManagementSettings.vue

@@ -33,6 +33,7 @@ async function purgeCache() {
 		'user',
 		'team',
 		'organization',
+		'file',
 		'loader_manifest',
 		'minecraft_manifest',
 		'categories',
@@ -40,8 +41,10 @@ async function purgeCache() {
 		'loaders',
 		'game_versions',
 		'donation_platforms',
+		'file_hash',
 		'file_update',
 		'search_results',
+		'search_results_v3',
 	]).catch(handleError)
 }