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_modules/@nodelib/fs.walk/out/readers/reader.js

@@ -0,0 +1,11 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const common = require("./common");
+class Reader {
+    constructor(_root, _settings) {
+        this._root = _root;
+        this._settings = _settings;
+        this._root = common.replacePathSegmentSeparator(_root, _settings.pathSegmentSeparator);
+    }
+}
+exports.default = Reader;