/* ────────────────────────────────────────────────────────────────────────── timeseries.js demo pages — shared chrome. Extracted from demo/index.html so all three demo pages (index, caldav, zabbix) share one look. Colours are declared once as custom properties on `body` and re-declared per theme, so a rule is written once instead of four times. `light` is the bare default and carries no class; `demo-nav.js` puts `theme-dark` / `theme-highContrast` / `theme-warm` on . Page-specific rules (index's plot-type gallery and live-mode controls, caldav's chart height, …) stay in the page's own