correct case of "WinUtil" in GUI / user-facing messages (#4675)

* WinUtil in .ps1

* WinUtil in GUI

* Update KnownIssues.md

scripts/main.ps1

@@ -140,7 +140,7 @@ try {
 
 if (-NOT ($readerOperationSuccessful)) {
     Write-Host "Failed to parse xaml content using Windows.Markup.XamlReader's Load Method." -ForegroundColor Red
-    Write-Host "Quitting winutil..." -ForegroundColor Red
+    Write-Host "Quitting WinUtil..." -ForegroundColor Red
     $sync.runspace.Dispose()
     $sync.runspace.Close()
     [System.GC]::Collect()
@@ -364,7 +364,7 @@ $sync["Form"].Add_ContentRendered({
         # Disable the install tab
         $sync.WPFTab1BT.IsEnabled = $false
         $sync.WPFTab1BT.Opacity = 0.5
-        $sync.WPFTab1BT.ToolTip = "Internet connection required for installing applications"
+        $sync.WPFTab1BT.ToolTip = "Internet connection required for installing applications."
 
         # Disable install-related buttons
         $sync.WPFInstall.IsEnabled = $false
@@ -373,7 +373,7 @@ $sync["Form"].Add_ContentRendered({
         $sync.WPFGetInstalled.IsEnabled = $false
 
         # Show offline indicator
-        Write-Host "Offline mode detected - Install tab disabled" -ForegroundColor Yellow
+        Write-Host "Offline mode detected - Install tab disabled." -ForegroundColor Yellow
 
         # Optionally switch to a different tab if install tab was going to be default
         Invoke-WPFTab "WPFTab2BT"  # Switch to Tweaks tab instead