Add minimal driver injection

scripts/main.ps1

@@ -534,9 +534,11 @@ $sync["FontScalingApplyButton"].Add_Click({
 
 # ── Win11ISO Tab button handlers ──────────────────────────────────────────────
 
-# Check for an existing working directory each time the Win11ISO tab is opened
 $sync["WPFTab5BT"].Add_Click({
-    Invoke-WinUtilISOCheckExistingWork
+    $sync["Form"].Dispatcher.BeginInvoke(
+        [System.Windows.Threading.DispatcherPriority]::Background,
+        [action]{ Invoke-WinUtilISOCheckExistingWork }
+    ) | Out-Null
 })
 
 $sync["WPFWin11ISOBrowseButton"].Add_Click({