PR 3 of the charts chantier — closes the loop on ADR-0023 by
wiring the three starter components from #171 onto the /audit
page.
Three computed signals derive aggregations from the *current page's*
items (no new BFF endpoint — server-side stats land separately if
ever needed):
* `dailyVolume` — events grouped by ISO date (YYYY-MM-DD).
* `outcomeBreakdown` — counts per outcome.
* `dailyByEventType` — flat (day, eventType, count) triples.
A new `<section class="charts">` renders above the existing filter
form, behind a `hasChartData()` guard so the section disappears
entirely on empty pages (no "0 events" donut, no half-rendered
bars). Each chart sits in a `.chart-tile`; the stacked-bar gets
`.chart-tile--wide` to span both grid columns since its legend
benefits from the extra horizontal space.
A `.charts-note` paragraph above the grid says explicitly that
the aggregations are "computed from the events currently loaded
on this page only" — honest disclosure of the per-page scope, no
misleading "all-time" framing.
Captions / descriptions / aria-labels live in plain English in the
template per ADR-0020's source-locale-only chrome posture. No new
i18n strings.
Bundle impact: the lazy `audit` chunk grows from ~4.4 KB to ~84 KB
gzip with the chart deps loaded — comfortable under [ADR-0017]'s
100 KB cap. The estimate in ADR-0023 was ~65 KB; Plot's full mark
set + d3-scale-chromatic interpolators add a bit more than
projected but still fit the budget.
Side tweaks:
* `apps/portal-admin/project.json` bumps the `anyComponentStyle`
budget from 5/6 KB to 6/8 KB to accommodate the charts grid
SCSS (audit.scss lands at ~6.5 KB).
* `apps/portal-admin/tsconfig.app.json` references the new
`libs/shared/charts/tsconfig.lib.json` (auto-added by `nx
sync` after the import in audit.ts).
Verification:
* 57 portal-admin specs pass (was 54; +3 for the charts section
rendering, the empty-page hide guard, and the donut center
label binding).
* `pnpm nx run-many -t lint test build --projects=portal-shell,
portal-admin,shared-charts` — green.
* Audit chunk gzip = 84 KB, under the budget.
Julien Gautier