Add 6 features: mode-click->UMAP, food-group filter, why-explainers, recipe builder, public API, saved queries (BrowserState)

Readability: black labels and table headers; #288B79 accent for buttons/sliders only

Kaikaku brand: dark teal + mint. UMAP single-trace (fix empty). Matplotlib heatmap (fix empty). All three sibling cards always visible.

Fix empty heatmap (placeholder when <2 items); render UMAP+heatmap at load; add Soft theme, 3D UMAP toggle, fridge->basket routing, sibling help text

Add UMAP visualisation, fridge parser, basket cosine heatmap (8 tabs total)

Add basket pairings, multi-direction SLERP, and Mikolov arithmetic tabs