optim fpstest ui and try to fix steam path related crash

src-tauri/src/cmds.rs

@@ -156,6 +156,22 @@ pub fn check_path(path: &str) -> Result<bool, String> {
     Ok(std::path::Path::new(&path).exists())
 }
 
+#[tauri::command]
+pub fn check_steam_dir_valid(steam_dir: &str) -> Result<bool, String> {
+    use std::path::Path;
+    
+    let path = Path::new(steam_dir);
+    if !path.exists() {
+        return Ok(false);
+    }
+    
+    // 检查是否存在 steam.exe 或 config 目录（至少有一个即可）
+    let steam_exe = path.join("steam.exe");
+    let config_dir = path.join("config");
+    
+    Ok(steam_exe.exists() || config_dir.exists())
+}
+
 ///// 录像
 #[tauri::command]
 pub async fn analyze_replay(app: tauri::AppHandle, path: &str) -> Result<String, String> {