function validateFilename()

in script.js [448:456]

• 7 lines of code
• 3 McCabe index (conditional complexity)

  function validateFilename() {
    if (!architectureNameInput.value.trim()) return;

    const sanitized = sanitizeFilename(architectureNameInput.value);
    if (sanitized !== architectureNameInput.value) {
      // Only update if different to avoid cursor jumping
      architectureNameInput.value = sanitized;
    }
  }