v2.12.0 — Charts, Cluster Map & Detail Modals

A large visualization & UX pass across the dashboard charts, the cluster map, and the node/guest detail modals.

Cluster Health chart

• Color-code the line by health value (green→red) with smooth, muted fades
• Migration markers reworked: density-binned with count badges, drawn on the line, show/hide toggle
• Locked to Medium smoothing + Full detail (clearer defaults); stacked & per-node views available

Resource charts (per node)

• Min/max envelope band, threshold lines, migration markers, synced crosshair, click-to-expand
• Overlay toggles (markers / thresholds / min-max) to cut clutter
• Fixed sparse/wavy rendering at 7d+ ranges
• Removed the unused "Show Predicted" toggle and decorative single-value sparklines

Cluster Map

• Node border tinted by migration rating + a labeled glass score badge, subtle glow
• New IOWait capacity bar (with exempt mark)
• Color circles by type or by load (heat)
• "Show plan" overlay: arrows from recommended guests to their target node
• Indicator markers (mounts / pinned / IOWait-exempt) are now distinct squares; fuller legend

Node & Guest detail modals

• Real history mini-charts (CPU/Mem/IOWait) from stored metrics — no fake data
• Node: guest list with one-click context + recommendations involving the node
• Guest: ranked migration-target chooser with one-click migrate, 24h usage chart, workload classification + affinity
• All detail sections are now collapsible (collapsed by default) for a compact view
• New /api/guests/<vmid>/history endpoint backing the guest usage chart