fix(charts): Guard against undefined loader data in ChartsCatalogCaseRoute

[sentry]

This PR addresses a TypeError: undefined is not an object (evaluating 'e.useLoaderData().case') that occurred in ChartsCatalogCaseRoute.

The root cause was that ChartsCatalogCaseRoute unconditionally accessed data.case from Route.useLoaderData(). During navigation between $caseId parameters (e.g., 40-geojson-map → 39-density-contours), TanStack Router can render the component before the new loader resolves, causing useLoaderData() to return undefined.

The fix adds a null guard (if (!data) return null) to ChartsCatalogCaseRoute in src/routes/_library/charts.catalog.charts.$caseId.tsx. This prevents accessing data.case when data is undefined, aligning with the defensive check already present in the route's head() function and ensuring the component gracefully handles pending loader data.

Fixes TANSTACK-COM-4RJ

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	tanstack-com	2984a77	Commit Preview URL Branch Preview URL	Sep 21 2026, 11:04 AM