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.stat/out/settings.d.ts

@@ -0,0 +1,16 @@
+import * as fs from './adapters/fs';
+export interface Options {
+    followSymbolicLink?: boolean;
+    fs?: Partial<fs.FileSystemAdapter>;
+    markSymbolicLink?: boolean;
+    throwErrorOnBrokenSymbolicLink?: boolean;
+}
+export default class Settings {
+    private readonly _options;
+    readonly followSymbolicLink: boolean;
+    readonly fs: fs.FileSystemAdapter;
+    readonly markSymbolicLink: boolean;
+    readonly throwErrorOnBrokenSymbolicLink: boolean;
+    constructor(_options?: Options);
+    private _getValue;
+}