feat: initial tauri desktop app rewrite with ui and settings wired

apps/desktop/src-tauri/src/fetch_test.rs

@@ -0,0 +1,13 @@
+use reqwest;
+
+#[tokio::main]
+async fn main() {
+    let url = "https://speed.hetzner.de/100MB.bin";
+    let client = reqwest::Client::builder()
+        .user_agent("Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36")
+        .build()
+        .unwrap();
+    let res = client.head(url).send().await.unwrap();
+    println!("Status: {}", res.status());
+    println!("Headers: {:?}", res.headers());
+}