Enhance output documentation and error handling

Scripts/GUI/MainWindow-AppSelection.ps1

@@ -234,8 +234,8 @@ function Get-AppRemovalScopeTarget {
         "AppRemovalScopeAllUsers" { return 'AllUsers' }
         "AppRemovalScopeCurrentUser" { return 'CurrentUser' }
         default {
-            Write-Warning "Unrecognized app-removal scope item '$($selectedItem.Name)'. Defaulting to AllUsers."
-            return 'AllUsers'
+            Write-Warning "Unrecognized app-removal scope item '$($selectedItem.Name)'. Skipping app removal."
+            return $null
         }
     }
 }

Scripts/GUI/Show-ApplyModal.ps1

@@ -114,8 +114,7 @@ function Show-ApplyModal {
         try {
             Invoke-AllChanges
 
-            $featureFailureCount = [int]$script:FeatureFailures
-            $failureCount = $featureFailureCount
+            $failureCount = [int]$script:FeatureFailures + [int]$script:AppRemovalFailures
             $appRemovalVerificationUnavailable = [bool]$script:AppRemovalVerificationUnavailable
             
             # Restart explorer if requested
@@ -156,7 +155,7 @@ function Show-ApplyModal {
                 }
                 else {
                     $script:ApplyCompletionTitleEl.Text = "Changes Applied with Errors"
-                    $script:ApplyCompletionMessageEl.Text = "$featureFailureCount change(s) failed. See console for details."
+                    $script:ApplyCompletionMessageEl.Text = "$failureCount change(s) failed. See console for details."
                 }
             } else {
                 Write-Host "All changes have been applied successfully!"

Scripts/GUI/Show-MainWindow.ps1

@@ -670,13 +670,15 @@ function Show-MainWindow {
         if ($selectedApps.Count -gt 0) {
             if (-not (Confirm-UnsafeAppRemoval -SelectedApps $selectedApps -Owner $window)) { return }
 
+            $scopeTarget = Get-AppRemovalScopeTarget -AppRemovalScopeCombo $appRemovalScopeCombo -OtherUsernameTextBox $otherUsernameTextBox
+            if ([string]::IsNullOrWhiteSpace($scopeTarget)) {
+                Write-Warning 'App removal was cancelled because the selected removal scope is invalid.'
+                return
+            }
+
             Add-Parameter 'RemoveApps'
             Add-Parameter 'Apps' ($selectedApps -join ',')
-
-            $scopeTarget = Get-AppRemovalScopeTarget -AppRemovalScopeCombo $appRemovalScopeCombo -OtherUsernameTextBox $otherUsernameTextBox
-            if (-not [string]::IsNullOrWhiteSpace($scopeTarget)) {
-                Add-Parameter 'AppRemovalTarget' $scopeTarget
-            }
+            Add-Parameter 'AppRemovalTarget' $scopeTarget
         }
 
         # Apply dynamic tweaks