test(worker): History — fill gaps + lifecycle test

docs/reference/domain-test-checklist.md

@@ -283,3 +283,31 @@ Guaranteed behaviors:
 > implemented** in the current code (there is no global 401 interceptor; `apiFetch` throws
 > `ApiError` and callers surface it via React Query). Left as-is (missing feature, not a defect);
 > not tested and not filed as a bug.
+
+## History — worker client
+
+Src covered (worker `apps/worker`): `src/screens/History.tsx` and `src/lib/export.ts` — both at
+100% stmts/branch/funcs/lines. No `c8 ignore`s needed.
+
+Guaranteed behaviors:
+
+- History renders the Dutch header (`Geschiedenis`) and the `Exporteer CSV` button.
+- Sessions render in the order the API returns them (`GET /api/sessions` is newest-first), one
+  `.session-card` per session, showing the activity name and its formatted duration.
+- `formatDuration` renders the legacy format: `Hh Mm` when hours are present (`3661 → 1h 1m`),
+  `Mm Ss` when only minutes (`125 → 2m 5s`), and just seconds under a minute (`45 → 45s`); a null
+  `duration_seconds` renders `0s`.
+- A card falls back to `"Onbekende handeling"` when `activity_name` is absent, omits the insole-type
+  pill when `insole_type` is null, and uses the singular noun (`inlegzool`) only for a pair count of
+  1 (`inlegzolen` otherwise).
+- A `Pauze <duration>` line shows only when `paused_seconds > 0` (absent when it is 0).
+- The empty state (`Nog geen opgeslagen sessies.`) shows only once loading has finished and there are
+  no sessions; while the query is still loading, neither the empty state nor any cards render.
+- Clicking `Exporteer CSV` calls `downloadExport`; when it rejects, the card surfaces the
+  `Kan de export niet openen` error message instead of throwing.
+- `downloadExport` (`src/lib/export.ts`): fetches `GET /api/export` with the bearer token when one is
+  stored (no `Authorization` header when there is none), then triggers a client-side download via an
+  object URL (`createObjectURL` → anchor `click` → `revokeObjectURL`); it throws
+  `"Kan de export niet openen"` when the response is not ok.
+- Lifecycle (`src/screens/History.test.tsx`): the list renders a completed session showing both its
+  worked duration and its `Pauze` line, then the export action invokes the download path.