navigator.clipboard.writeText is gated on isSecureContext - HTTPS
or localhost only. PXE dashboard is served over plain HTTP
(10.9.100.1:9009) so the API was undefined and the chain threw
before .catch fired - user saw nothing. Wrap clipboard write in
copyText() that prefers the modern API and falls back to the
classic invisible-textarea + document.execCommand('copy') path
which works on HTTP. Visual flash logic moved into flashCopied()
for reuse.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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