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/prelude-ls/README.md

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+# prelude.ls [![Build Status](https://travis-ci.org/gkz/prelude-ls.png?branch=master)](https://travis-ci.org/gkz/prelude-ls)
+
+is a functionally oriented utility library. It is powerful and flexible. Almost all of its functions are curried. It is written in, and is the recommended base library for, <a href="http://livescript.net">LiveScript</a>.
+
+See **[the prelude.ls site](http://preludels.com)** for examples, a reference, and more.
+
+You can install via npm `npm install prelude-ls`
+
+### Development
+
+`make test` to test
+
+`make build` to build `lib` from `src`
+
+`make build-browser` to build browser versions