Add a tool to switch the Windows display scale between 100% and 200%

81-Toggle-Scale.ps1 writes LogPixels, Win8DpiScaling and AppliedDPI for
the current user; the change needs a restart, so the .bat launcher offers
to restart at the end. It is picked up by the existing NN-*.bat/.ps1
globs and copied to Desktop\Tools.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

seediso/windows11/81-Toggle-Scale.ps1

@@ -0,0 +1,34 @@
+# Switches the display scale between 100% and 200% for the current user.
+# With no argument it toggles; -Scale 100 or -Scale 200 forces a value.
+# The scale is stored in the registry (LogPixels), so the change takes effect only after
+# a restart. Use -Restart to reboot right away.
+param(
+    [ValidateSet(0, 100, 200)]
+    [int]$Scale = 0,
+    [switch]$Restart
+)
+
+$ErrorActionPreference = 'Stop'
+
+$desktopKey = 'HKCU:\Control Panel\Desktop'
+$metricsKey = 'HKCU:\Control Panel\Desktop\WindowMetrics'
+
+$logPixels = (Get-ItemProperty -Path $desktopKey -Name LogPixels -ErrorAction SilentlyContinue).LogPixels
+if (-not $logPixels) { $logPixels = 96 }
+$current = [int][math]::Round($logPixels * 100 / 96)
+
+$target = if ($Scale -ne 0) { $Scale } elseif ($current -eq 100) { 200 } else { 100 }
+$dpi = [int]($target * 96 / 100)
+
+Write-Host "Scale: $current% -> $target%"
+
+# Win8DpiScaling=1 makes Windows use LogPixels instead of the per-monitor recommendation.
+Set-ItemProperty -Path $desktopKey -Name LogPixels -Type DWord -Value $dpi
+Set-ItemProperty -Path $desktopKey -Name Win8DpiScaling -Type DWord -Value 1
+Set-ItemProperty -Path $metricsKey -Name AppliedDPI -Type DWord -Value $dpi
+
+Write-Host 'Restart Windows for the new scale to take effect.'
+if ($Restart) {
+    Write-Host 'Restarting in 5 seconds...'
+    shutdown.exe /r /t 5
+}