Single KPI/stat card with label, value, trend, and optional context. Themeable via card style (including inner), elevation, padding, tone, alignment, and trend presentation.

• src/components/registry/components/cards-and-lists/stats-card.tsx→components/registry/components/cards-and-lists/stats-card.tsx
• src/components/registry/components/cards-and-lists/stats-card.recipe.ts→src/recipes/stats-card.recipe.ts
• src/components/registry/components/cards-and-lists/_card-chrome-params.ts→components/registry/components/cards-and-lists/_card-chrome-params.ts
• src/components/registry/components/cards-and-lists/_card-chrome-params.ts→src/recipes/_card-chrome-params.ts