Fix: Show reboot warning for undoing features that require it (#699)

Scripts/Helpers/Get-RebootFeatureLabels.ps1

@@ -0,0 +1,27 @@
+<#
+    .SYNOPSIS
+    Resolves display labels for selected features that require reboot.
+
+    .DESCRIPTION
+    Combines parameter keys from both forward and undo selections, removes duplicates,
+    and returns the feature label that should be shown to users. Undo selections use
+    UndoLabel when available.
+#>
+function Get-RebootFeatureLabels {
+    $rebootFeatureLabels = [System.Collections.Generic.List[string]]::new()
+    $candidateParamKeys = (@($script:Params.Keys) + @($script:UndoParams.Keys)) | Select-Object -Unique
+
+    foreach ($paramKey in $candidateParamKeys) {
+        if ($script:Features.ContainsKey($paramKey) -and $script:Features[$paramKey].RequiresReboot -eq $true) {
+            $feature = $script:Features[$paramKey]
+            $isUndo = $script:UndoParams.ContainsKey($paramKey)
+            $displayLabel = if ($isUndo -and $feature.UndoLabel) { $feature.UndoLabel } else { $feature.Label }
+
+            if (-not [string]::IsNullOrWhiteSpace([string]$displayLabel)) {
+                [void]$rebootFeatureLabels.Add([string]$displayLabel)
+            }
+        }
+    }
+
+    return $rebootFeatureLabels
+}