feat(activity): update summary cards to toggles and introduce export menu

docs/api.md

@@ -40,7 +40,7 @@ key never reads the audit trail. Events are append-only; there is no `POST`, `PU
 
 Query: `q`, `actor` (`user:ID`, `key:ID`, `system`), `category` (`articles`, `media`, `users`,
 `api_keys`, `auth`, `system`), `outcome` (`all`, `success`, `failed`), `security` (`true`), `range`
-(`today`, `7d`, `30d`, `custom`; default `7d`), `from` and `to` (dates, with `custom`), `page` (from
+(`today`, `7d`, `30d`, `all`, `custom`; default `7d`), `from` and `to` (dates, with `custom`), `page` (from
 1) and `size` (25, 50 or 100). Any invalid value answers 400 with the body-mismatch message. Dates
 are UTC. The list answers `{ items, total, page, size }`, newest first (`created_at`, then `id`).