Milestone 72 phase C — bring the host-view graphs onto the dashboard:
- host_resource_history widget reworked into a real host-view chart: epoch-ms
linear axis (no Chart.js date adapter), themed like the host-detail charts,
maintainAspectRatio:false so it fills the resized panel, unique canvas per
widget instance (wid), and empty states ("pick a host" / "no metrics yet").
Was previously unusable — it had a broken time axis and no way to choose a host.
- Add a "host" param type: the edit form renders a live dropdown of hosts
(dashboard routes now pass the host list to the editor); the chosen host_id is
stored in config and fed to the widget.
- Hosts-overview widget gains a per-row CPU sparkline (last hour) via the shared
sparkline_svg helper — the host-view at-a-glance trend, on the main widget.
Charts/sparklines render only in the browser, so CI can't exercise them — needs
an operator visual check.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
bvandeusen
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