D339 — The reading panels share one page kit

Decision. Activity, Work and Health are built from one set of components (web/src/components/Page.tsx) and one stylesheet (web/src/styles/pages.css): a header whose title answers in a sentence with its count in bold and folds long explanations behind a ?; an open hero, with no box around it, that sums the answer up — large figures, a chart where there is a series, filters as pills and a Map bar; sections of dense rows without a box around them, with row actions shown on hover or focus; and a one-line, positive note where a list would be empty. The pages share one width (1,360px), mark rows with their Map's colour, and keep the previous answer on screen, dimmed, while a new one loads. Artifacts is a catalog page of the same kit — header, kind filters in the hero, a section of tiles per kind — and opens an artifact in a panel beside it, the way the atlas opens a concept. No glow and no decorative shadow: colour, glyphs and hairlines carry the emphasis.

Why. Each panel had grown its own header, width, list style and empty state: 880px columns beside full-width boards, bordered grey boxes, serif headings on some pages and not others. The result read as several documents rather than one application, and every new panel copied a different one. A kit makes the consistent choice the cheap one and moves the decisions — widths, the band, the row — to one place, where a change applies to every page.

Alternatives rejected. - A component library: a dependency and its theming layer for a handful of pieces the token system already styles (docs/conventions.md keeps the runtime dependencies to what the UI cannot do without). - Restyling each panel on its own: the drift that produced the problem. - A band of cards, one per summary: tried first; a card sized by its row left empty space beside its neighbours, and boxes around a few numbers made the pages read heavier than their content. - Folding the kit into components.css: pages and the graph shell change for different reasons, and one 2,700-line file hid which rules a page owned.