`${values.spec?.resources?.cpu}` turned an unset cpu into the literal
string "undefined", which fails k8s quantity validation. Omit cpu when
it has no value instead.
- bar-chart: barMinWidth so hour-granularity bars stay visible with gaps.
- pie-chart: single legend-beside-pie layout, value (percent%) tooltip,
2-decimal rounding for the Summary donut.
The data layer the resource tabs build on:
- apis/resource.ts: adapter over the unified metered_usage read API
(resource/gpu-instances/storage/summary/events breakdowns), flattening
the server's generic shape into the per-tab item shape.
- hooks/use-resource-meta.ts: loads creators/instances/volumes filter
options for the current scope.
- utils/time-buckets.ts: day/week/month/hour bucket keys + range fill.
- utils/export-breakdown.ts: derive Excel columns from antd table specs.
