fix: suppress terminal window flash on Windows for all subprocesses (#165)

src-tauri/src/wsl_notifications.rs

@@ -1,6 +1,8 @@
 use std::process::Command;
 use tauri::command;
 
+use crate::process_ext::HideWindow;
+
 #[command]
 pub async fn send_wsl_notification(title: String, body: String) -> Result<(), String> {
     // Method 1: Try Windows 10/11 toast notification using PowerShell
@@ -36,6 +38,7 @@ $notifier.Show($toast)
 
     // Try PowerShell.exe through WSL
     let output = Command::new("/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe")
+        .hide_window()
         .arg("-NoProfile")
         .arg("-ExecutionPolicy")
         .arg("Bypass")
@@ -65,6 +68,7 @@ $notifier.Show($toast)
 
     // Method 3: Try wsl-notify-send if available
     let notify_result = Command::new("wsl-notify-send")
+        .hide_window()
         .arg("--appId")
         .arg("HikariDesktop")
         .arg("--category")