v0.2.3

YAML button now opens a popup instead of copying silently.

• Fixes "Zwischenablage nicht verfügbar" for users on plain-HTTP LAN access
  (the browser clipboard API is only available in secure/HTTPS contexts).
• The popup shows the ready-to-paste remote.send_command action YAML in a
  selectable field, with a Kopieren button (clipboard API + execCommand
  fallback) and preselected text for manual copy.
• Device/command values are quoted so names with spaces stay valid YAML.