Gradient-map test page

Internal QA only. Not a real page — nothing here should be linked from navigation or content. Run npm run gradient-map:test-preview before viewing this page or building the site if src/lib/gradient-map/config.ts has changed; not wired into the live site yet.

1. Palette per category

One reference photo (laundry-hero), run through each top-level category's own window of the flower palette, at baseline (no per-image variation) so the palettes themselves compare fairly.

2. Family: laundry

Every real, already-processed image claimed by this category, original next to its actual treated version — real per-image variation, not baseline.