fix: don't open console window on windows

Author: lklimek

src/backend_task/core/start_dash_qt.rs

@@ -133,7 +133,7 @@ fn signal_term(child: &Child) -> Result<(), String> {
 }
 
 #[cfg(windows)]
-fn signal_term(child: &Child) -> Result<(), String> {
+fn signal_term(_child: &Child) -> Result<(), String> {
     // TODO: Implement graceful termination for Dash-Qt on Windows.
     tracing::warn!(
         "SIGTERM signal is not supported on Windows. Dash-Qt process will not be gracefully terminated."

src/main.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(target_os = "windows", windows_subsystem = "windows")]
+
 use dash_evo_tool::*;
 
 use crate::app_dir::{app_user_data_dir_path, create_app_user_data_directory_if_not_exists};