feat: Add presence heartbeat for Matrix online status

- matrix-gateway: POST /internal/matrix/presence/online endpoint
- usePresenceHeartbeat hook with activity tracking
- Auto away after 5 min inactivity
- Offline on page close/visibility change
- Integrated in MatrixChatRoom component

node-network-app/node_modules/escalade/sync/index.d.mts

@@ -0,0 +1,9 @@
+export type Callback = (
+	directory: string,
+	files: string[],
+) => string | false | void;
+
+export default function (
+	directory: string,
+	callback: Callback,
+): string | void;