fix some ui and trying to fix black window

src-tauri/src/downloader.rs

@@ -66,6 +66,8 @@ pub async fn fetch_metadata(app: &AppHandle, url: &str, parse_mix_playlist: bool
     let qjs_path = binary_manager::get_qjs_path(app)?; // Get absolute path to quickjs
     
     let mut cmd = Command::new(ytdlp_path);
+    #[cfg(target_os = "windows")]
+    cmd.creation_flags(0x08000000);
     
     // Pass the runtime and its absolute path to --js-runtimes
     cmd.arg("--js-runtimes").arg(format!("quickjs:{}", qjs_path.to_string_lossy())); 
@@ -200,6 +202,8 @@ pub async fn download_video(
     }).ok();
 
     let mut cmd = Command::new(ytdlp_path);
+    #[cfg(target_os = "windows")]
+    cmd.creation_flags(0x08000000);
     
     let mut child = cmd
         .args(&args)