fix: align PowerShell 7 document handling

Author: lyfhf

scripts/generate-docx-field-map.ps1

@@ -607,12 +607,25 @@ $sectionRules = @(
   }
 )
 
+$sectionHeadingLookupKeys = @{}
+foreach ($rule in $sectionRules) {
+  foreach ($alias in @($rule.aliases)) {
+    $headingKey = Get-SectionHeadingLookupKey -Text ([string]$alias)
+    if (-not [string]::IsNullOrWhiteSpace($headingKey)) {
+      $sectionHeadingLookupKeys[$headingKey] = $true
+    }
+  }
+}
+
 $extraSectionRules = @(
   foreach ($heading in $extraSectionHeadings) {
     $headingKey = Get-SectionHeadingLookupKey -Text ([string]$heading)
     if ([string]::IsNullOrWhiteSpace($headingKey)) {
       continue
     }
+    if ($sectionHeadingLookupKeys.ContainsKey($headingKey)) {
+      continue
+    }
 
     [pscustomobject]@{
       id = "__extra_section_$headingKey"

scripts/insert-docx-images.ps1

@@ -1023,16 +1023,15 @@ function Get-SingleXmlNode {
   )
 
   if ($NodeLike -is [System.Xml.XmlNode]) {
-    Write-Output -NoEnumerate $NodeLike
-    return
+    return ,$NodeLike
   }
 
   $candidates = @($NodeLike | Where-Object { $_ -is [System.Xml.XmlNode] })
   if ($candidates.Count -eq 0) {
     throw "Expected an XmlNode-compatible value."
   }
 
-  Write-Output -NoEnumerate $candidates[0]
+  return ,$candidates[0]
 }
 
 function New-ImageParagraph {
@@ -1424,8 +1423,7 @@ function Get-SectionEndInsertionNode {
   )
 
   if ($TargetNode.LocalName -ne "p" -or $TargetNode.ParentNode.LocalName -ne "body") {
-    Write-Output -NoEnumerate $TargetNode
-    return
+    return ,$TargetNode
   }
 
   $insertionNode = $TargetNode
@@ -1446,7 +1444,7 @@ function Get-SectionEndInsertionNode {
     $cursor = $cursor.NextSibling
   }
 
-  Write-Output -NoEnumerate $insertionNode
+  return ,$insertionNode
 }
 
 function Get-EffectiveInsertionNode {
@@ -1461,11 +1459,10 @@ function Get-EffectiveInsertionNode {
   $targetNode = Get-SingleXmlNode -NodeLike $ResolvedTarget.Node
   if ([string]$ResolvedTarget.ResolutionKey -like "section:*") {
     $sectionEndNode = Get-SectionEndInsertionNode -TargetNode $targetNode -NamespaceManager $NamespaceManager
-    Write-Output -NoEnumerate $sectionEndNode
-    return
+    return ,$sectionEndNode
   }
 
-  Write-Output -NoEnumerate $targetNode
+  return ,$targetNode
 }
 
 function Get-EffectiveRowLayoutTarget {