## v0.3.1 (2026-05-18)

### Features
- **Foreground process sensors** — new "Foreground" device (linked to the hub via `via_device`) exposing what's currently in focus on the remote PC:
  - `sensor.foreground_process` — process name as state, with full payload (PID, exec path, window title, fullscreen flag, monitor, geometry, browser detection, browser page title/URL, error) as attributes
  - `sensor.window_title`, `sensor.pid`, `sensor.foreground_monitor`, `sensor.process_started` (TIMESTAMP device class)
  - `binary_sensor.fullscreen`, `binary_sensor.minimized`
  - Fed by a new `ForegroundCoordinator` polling `GET /api/foreground` every 5s, with near-real-time updates via the existing WebSocket (`foreground` / `foreground_update` push frames flow into the coordinator) ([9d27727](https://git.dolgolyov-family.by/alexei.dolgolyov/haos-hacs-integration-media-player/commit/9d27727))
- **Optional API token** — `CONF_TOKEN` is now optional. When the media server runs without `api_tokens` configured (auth disabled), the integration omits the `Authorization` header and `?token=` query from REST, WebSocket, and album-art URLs. Server-side auth rejections still surface as `invalid_auth` in the UI ([ab05852](https://git.dolgolyov-family.by/alexei.dolgolyov/haos-hacs-integration-media-player/commit/ab05852))

### Performance
- **Shared `DisplayCoordinator`** — a single `/api/display/monitors` poll per cycle is now fanned out to all per-display entities (binary sensors, numbers, selects, sensors, switches) via `CoordinatorEntity`. Removes ~9x redundant requests per polling cycle that previously came from each entity calling `get_display_monitors()` in its own `async_update` ([ab05852](https://git.dolgolyov-family.by/alexei.dolgolyov/haos-hacs-integration-media-player/commit/ab05852))
- **Optimistic write-through** — `coordinator.apply_optimistic(...)` keeps sibling entities in sync after slider/select writes without an extra network round-trip ([ab05852](https://git.dolgolyov-family.by/alexei.dolgolyov/haos-hacs-integration-media-player/commit/ab05852))

### UI / Localization
- Display entities migrated to Home Assistant **translation keys** (`strings.json` / `translations/*`), so per-language UI text flows through the standard locale mechanism instead of hardcoded English strings ([9d27727](https://git.dolgolyov-family.by/alexei.dolgolyov/haos-hacs-integration-media-player/commit/9d27727))

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<details>
<summary>All Commits</summary>

| Hash | Message | Author |
|------|---------|--------|
| [9d27727](https://git.dolgolyov-family.by/alexei.dolgolyov/haos-hacs-integration-media-player/commit/9d27727) | feat(foreground): foreground process sensors + translation key migration | alexei.dolgolyov |
| [ab05852](https://git.dolgolyov-family.by/alexei.dolgolyov/haos-hacs-integration-media-player/commit/ab05852) | feat: shared DisplayCoordinator + optional API token | alexei.dolgolyov |

</details>