Page now uses Bootstrap 5.3 color modes (data-bs-theme), Bootstrap Icons,
and Bootstrap modals. Custom code shrinks to dashboard.css (app tokens,
score bar, signal accents) and dashboard.js (rendering/polling logic,
ported verbatim from the inline script). dashboard_publisher copies the
new css/js into the docroot; all 381 tests still green.
Harwinder Sekhon