A Reactive Dashboard with Lit and Signals

Build a real analytics interface on web components: a TC39 signals store, a debounced query runner that cannot render a stale result, twelve Lit components with their own shadow styles, D3 charts, and a design system that recolors from one slider. Free and text-first.

1. The Store Is a Module
2. A Debounced, Race-Free Query Runner
3. First Components, and the Scaffolding Dies
4. Stat Cards and Sparklines
5. Filters on Platform Primitives
6. The Dual-Handle Slider and a Reset That Appears
7. D3 Inside a Shadow Root
8. The Heatmap D3 Didn't Build
9. The Table: Sort, Paginate, Pivot
10. The App Explains Itself
11. What "Wow" Costs, as One Diff

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