The Clipboard API requires a secure context, so navigator.clipboard is
undefined when Sencho is accessed over HTTP on a LAN IP. Most copy
buttons therefore failed silently and a few even fired success toasts
without writing anything to the clipboard.
Extract a shared copyToClipboard helper that prefers the modern API in
secure contexts and falls back to a hidden-textarea execCommand path
otherwise, then route every existing call site through it.
Anso