fix(windows): address code review issues

- Fix openInExplorer to actually execute explorer.exe (was a no-op)
- Load System.Windows.Forms assembly before using Clipboard
- Use Remove-SafeItem in purge for consistent safety checks
- Fix Dropbox typo (was DroplboxCache)

windows/cmd/analyze/main.go

@@ -7,6 +7,7 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"runtime"
 	"sort"
@@ -671,19 +672,11 @@ func truncatePath(path string, maxLen int) string {
 // openInExplorer opens a path in Windows Explorer
 func openInExplorer(path string) {
 	// Use explorer.exe to open the path
-	cmd := fmt.Sprintf("explorer.exe /select,\"%s\"", path)
 	go func() {
-		_ = runCommand("cmd", "/c", cmd)
+		exec.Command("explorer.exe", "/select,", path).Run()
 	}()
 }
 
-// runCommand runs a command and returns the output
-func runCommand(name string, args ...string) error {
-	cmd := fmt.Sprintf("%s %s", name, strings.Join(args, " "))
-	_ = cmd
-	return nil
-}
-
 func main() {
 	var startPath string