A press-and-drag gesture over a card's badge/button text also triggered
the browser's native selection highlight, distracting and occasionally
fighting the pointer-based drag tracking closely enough to break it.
Replaces the ad-hoc inline styling with a shared base template driven by
CSS custom properties (light/dark palettes), a card-based two-column
layout, and a persistent dark-mode toggle. Also moves quiet-hours'
timezone from the container's TZ env var into a proper web UI setting
(zoneinfo-backed), so it no longer needs a docker-compose.yml edit and
restart to change.
tfaour