🐛 dashboard: distinct per-band palette for Overview charts

[clubanderson]

Closes #10654

[kubestellar-prow]

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[github-actions]

Open PR overlap check

Base branch: v5

Conflicts are checked with every PR merged onto the current tip of v5, so a PR that only needs a rebase is not reported as conflicting with its siblings.

PR	Title	Relation	Files
#10661	🐛 dashboard: double Overview chart transition durations	same files	src/pkg/dashboard/static/index.html
#10663	🐛 dashboard: version popover too narrow — values truncated	same files	src/pkg/dashboard/static/index.html
#10655	✨ Spek recheck cadence for continuous convergence	same files	src/pkg/dashboard/static/index.html
#10662	✨ dashboard: open Overview settings in a modal	same files	src/pkg/dashboard/static/index.html

[github-actions]

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