fix: Correct PowerShell toast notification command syntax

Author: Your Name

cecli/io.py

@@ -1710,7 +1710,7 @@ def get_default_notification_command(self):
             # PowerShell toast notification
             return (
                 "powershell -command"
-                f" \"try {{ Add-Type -AssemblyName System.Runtime.WindowsRuntime; $null = [Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] }} catch {{}}; "
+                f' "try {{ Add-Type -AssemblyName System.Runtime.WindowsRuntime; $null = [Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] }} catch {{}}; '
                 f"$template = [Windows.UI.Notifications.ToastNotificationManager]::GetTemplateContent([Windows.UI.Notifications.ToastTemplateType]::ToastText02); "
                 f"$toastXml = $template.GetXml(); "
                 f"$toastXml.GetElementsByTagName('text')[0].AppendChild($template.CreateTextNode('cecli')) > $null; "