Fix Additional Packages dropdown becoming permanently disabled (#75)

* Initial plan

* Fix Additional Packages dropdown behavior for Virtual/non-Virtual controls

Co-authored-by: Power-Maverick <36135520+Power-Maverick@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Power-Maverick <36135520+Power-Maverick@users.noreply.github.com>

Author: Copilot

Maverick.PCF.Builder.DataObjects/ControlManifestDetails.cs

@@ -19,6 +19,7 @@ public ControlManifestDetails()
             Properties = new List<ControlProperty>();
             Features = new List<Feature>();
             IsVirtual = false;
+            AdditionalPackageIndex = 0; // Default to "None" (first item in the dropdown)
         }
 
         public string WorkingFolderPath { get; set; }

Maverick.PCF.Builder/PCFBuilder.cs

@@ -745,6 +745,9 @@ private void PopulateControlDetails()
 
             cboxControlType.SelectedIndex = ControlDetails.IsVirtual ? 1 : 0;
             cboxTemplate.SelectedIndex = ControlDetails.IsDatasetTemplate ? 1 : 0;
+            
+            // Restore the additional package selection from saved control details
+            cboxAdditionalPackages.SelectedIndex = ControlDetails.AdditionalPackageIndex;
 
             if (!string.IsNullOrEmpty(ControlDetails.PreviewImagePath))
             {
@@ -2673,11 +2676,16 @@ private void btnManageFeatures_Click(object sender, EventArgs e)
 
         private void cboxControlType_SelectedIndexChanged(object sender, EventArgs e)
         {
-            if ((string)cboxControlType.SelectedItem == "Virtual")
+            if (cboxControlType.SelectedItem != null && (string)cboxControlType.SelectedItem == "Virtual")
             {
                 cboxAdditionalPackages.SelectedIndex = 1;
                 cboxAdditionalPackages.Enabled = false;
             }
+            else
+            {
+                // Re-enable the additional packages dropdown for non-Virtual control types
+                cboxAdditionalPackages.Enabled = true;
+            }
         }
 
         #endregion