Fix success message formatting issues

- Use t.Vprint with fmt.Sprintf instead of t.Vprintf to fix printf formatting errors
- Ensures proper formatting of source, destination, and duration values
- Addresses GitHub comment feedback about MISSING values in output

Co-Authored-By: Alec Fong <alecsanf@usc.edu>

Author: devin-ai-integration[bot]

pkg/cmd/copy/copy.go

@@ -216,7 +216,7 @@ func runSCP(t *terminal.Terminal, sshAlias, localPath, remotePath string, isUplo
 	}
 
 	duration := time.Since(startTime)
-	t.Vprintf(t.Green("✓ Successfully copied %s → %s (%v)\n"), source, dest, duration.Round(time.Millisecond))
+	t.Vprint(t.Green(fmt.Sprintf("✓ Successfully copied %s → %s (%v)\n", source, dest, duration.Round(time.Millisecond))))
 
 	return nil
 }