fix(windows): fix property access errors and scanning performance

- Fix analyze: Add timeout and depth limits to calculateDirSize() to prevent
  indefinite scanning on large directories like user profile
- Fix purge: Add null checks for .Count property access under StrictMode
- Fix uninstall: Wrap registry property access in try/catch for items without
  DisplayName, and add null checks throughout
- Fix mole.ps1: Add null check for Arguments.Count
- Add try/catch around CursorVisible calls for non-interactive terminals

All 73 Pester tests and all Go tests pass.

windows/mole.ps1

@@ -163,7 +163,8 @@ function Invoke-MoleCommand {
     
     # Execute the command script with arguments using splatting
     # This properly handles switch parameters passed as strings
-    if ($Arguments -and $Arguments.Count -gt 0) {
+    $argCount = if ($null -eq $Arguments) { 0 } else { @($Arguments).Count }
+    if ($argCount -gt 0) {
         # Build a hashtable for splatting
         $splatParams = @{}
         $positionalArgs = @()