## What
Adds two timestamp columns to `users`:
- **`last_logged_in_at`** — set by an `UpdateLastLoggedInAt` listener on
Laravel's `Login` event. Records each explicit authentication (login
form or remember-me re-auth). Does **not** update on plain session-based
requests.
- **`last_active_at`** — set by a `TrackLastActiveAt` middleware on
authenticated web requests. Records the last moment the user did
anything. Throttled to at most one write per 5 minutes to avoid a DB
write on every request.
## Why
`last_logged_in_at` answers "when did they last authenticate";
`last_active_at` answers "when were they last using the app" (any
screen/activity), which a session-based login does not capture.
## Tests
- Login records `last_logged_in_at`
- Authenticated request records `last_active_at`
- Throttle window respected (no rewrite within 5 min) and refreshed once
it passes
Migrations not yet run on environments.
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