docs: phase 3b.2 reports/export session log + roadmap note

docs/roadmap.md

@@ -187,8 +187,13 @@ Each phase keeps the system working and is its own spec → plan → build cycle
   `GET /api/admin/users` roster), an admin **Sessies** screen (list + status filter +
   create/edit form + row actions), Stop/Annuleer on the Live cards, and a worker stopwatch
   that polls (15 s) and reconciles to server truth (converges within ~15 s when an admin
-  stops/cancels/edits a session — no stuck state). **3b remaining:** reports/export
-  (all-users filtered CSV — current `/api/export` is self-scoped) and user management
+  stops/cancels/edits a session — no stuck state).
+  **3b·2 implemented** (plan `docs/superpowers/plans/2026-06-24-phase-3b2-reports-export.md`):
+  the admin **Rapporten** screen (period presets Deze week / Deze maand / Alles +
+  worker/type/activity filters, headline totals and breakdowns per worker/activity/type) backed by
+  `GET /api/admin/report` (completed-only, JS aggregation), plus an all-users filtered CSV via
+  `GET /api/admin/export` — a shared `buildSessionsCsv(rows, {includeWorker})` now serves both the
+  worker self-export and the admin export. **3b remaining:** user management
   (better-auth `/api/auth/admin/*`).
   Activity management (add/edit/delete handelingen + their `insole_types`) was removed from the
   worker client in the Phase 2 follow-up because it is admin-only; it must be **ported here**. The