navigator.clipboard is undefined in non-secure contexts, so the direct
writeText() call threw synchronously and the execCommand fallback in its
.catch() never ran. _copyText() now feature-detects the API, falls back
to execCommand('copy'), then to a prompt() for manual copying. log.js
reuses the helper; _getShareBaseUrl() caches the LAN-IP lookup so token
Copy buttons stay within the click gesture execCommand requires.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
