fix(dashboard): render risk overview shell while data loads

[simplesagar]

Summary

• /risk-overview was collapsing to a Loading… blob and hiding the entire Policy Activity section until data arrived, which felt slow on first paint and blinked on every time-range change.
• Apply the same loading-shell pattern that ProjectDashboard (project home) uses: always render both Page.Section blocks, swap each KPI card / ranked list / trend chart's body for a <Skeleton> while the data is loading, and only collapse to NoPoliciesEmptyState once data has actually arrived.
• Pass placeholderData: keepPreviousData to useRiskOverview so date-range changes don't blank the page after the first successful load. useRiskOverview (unlike the project-overview hook) includes from/to in its query key, so without this every range change re-triggers isLoading=true.
• InsightsConfig now mounts only when overview is populated so its contextInfo never embeds undefined counts.

Test plan

• Throttle the network and visit /risk-overview — confirm the page header, both section headers, KPI grid skeletons, three ranked-list card skeletons, and the chart skeleton all paint immediately; no Loading… text.
• After data arrives, confirm the skeletons swap in place for the real MetricCard / RankedBarList / RiskTrendChart with no layout shift.
• Change the time-range picker — the previous data should remain visible (no blanking) while the new range fetches.
• Confirm NoPoliciesEmptyState still renders for a project with activePolicies === 0.
• Confirm the error branch still renders the shell + error block on a forced failure.

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Project	Deployment	Actions	Updated (UTC)
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