Fix duplicate data-layer calls during build

[pettinarip]

I noticed we were hitting Netlify Blobs multiple times for the same data during static generation. For example, getGrowThePieData was being called 6 times instead of once when building the layer-2 pages.

The issue: Next.js renders each page twice during build (data collection + HTML generation), and unstable_cache alone doesn't deduplicate within the same render cycle.

The fix: Wrap our cached getters with React's cache() function, which memoizes calls within the same request/render. Now we get:

• cache() → deduplication within same render
• unstable_cache → persistence across requests with time-based revalidation

Before: ~6 calls per data source during build
After: ~2 calls (one per worker process)

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