Fix Draw-AsciiBanner function for PS 5.1 compatibility

Author: tpcarman

Src/Private/Draw-AsciiBanner.ps1

@@ -9,19 +9,26 @@ function Draw-AsciiBanner {
     $maxLen = ($Lines | Measure-Object Length -Maximum).Maximum
     $contentWidth = $maxLen + ($ExtraPadding * 2)
 
-    # Top and bottom borders
-    $top    = "╭" + ("─" * ($contentWidth + 2)) + "╮"
-    $bottom = "╰" + ("─" * ($contentWidth + 2)) + "╯"
+    # Top and bottom borders - use Unicode code points for PS 5.1 compatibility
+    $topLeft = [char]0x256D      # ╭
+    $topRight = [char]0x256E     # ╮
+    $bottomLeft = [char]0x2570   # ╰
+    $bottomRight = [char]0x256F  # ╯
+    $horizontal = [char]0x2500   # ─
+    $vertical = [char]0x2502     # │
+
+    $top = $topLeft + ($horizontal.ToString() * ($contentWidth + 2)) + $topRight
+    $bottom = $bottomLeft + ($horizontal.ToString() * ($contentWidth + 2)) + $bottomRight
 
     Write-Host $top -ForegroundColor $BorderColor
     foreach ($line in $Lines) {
         $totalPadding = $contentWidth - $line.Length
         $leftPad  = [math]::Floor($totalPadding / 2)
         $rightPad = $totalPadding - $leftPad
-        $padded = (" " * $leftPad) + $line + (" " * $rightPad)
-        Write-Host "│ " -NoNewline -ForegroundColor $BorderColor
+        $padded = (' ' * $leftPad) + $line + (' ' * $rightPad)
+        Write-Host "$vertical " -NoNewline -ForegroundColor $BorderColor
         Write-Host $padded -NoNewline -ForegroundColor $TextColor
-        Write-Host " │" -ForegroundColor $BorderColor
+        Write-Host " $vertical" -ForegroundColor $BorderColor
     }
     Write-Host $bottom -ForegroundColor $BorderColor
 }