Refactor proxy handling and update related UI flows

apps/windows-client/src-tauri/tests/command_tests.rs

@@ -37,6 +37,7 @@ use models::{
 use proxifyre::ProxiFyreAdapter;
 use std::collections::HashSet;
 use std::fs;
+use std::net::TcpListener;
 use std::path::{Path, PathBuf};
 #[cfg(windows)]
 use std::process::Command as ProcessCommand;
@@ -127,6 +128,24 @@ fn resolve_preview_returns_structured_apps_without_filesystem_scan() {
         .any(|warning| warning.contains("Сканирование папок отложено")));
 }
 
+#[test]
+fn ping_proxy_target_reports_open_tcp_endpoint() {
+    let listener = TcpListener::bind("127.0.0.1:0").expect("bind local listener");
+    let port = listener.local_addr().expect("read local addr").port();
+
+    let result = commands::ping_proxy_target_endpoint(commands::PingProxyTargetInputDto {
+        host: "127.0.0.1".to_string(),
+        port,
+    })
+    .expect("ping should return response");
+
+    assert_eq!(result.tag, "external-proxy");
+    assert_eq!(result.server, "127.0.0.1");
+    assert_eq!(result.server_port, port);
+    assert!(result.ok);
+    assert!(result.latency.is_some());
+}
+
 #[test]
 #[cfg(windows)]
 fn proxifyre_install_script_parses_as_powershell() {