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/reusify/benchmarks/createNoCodeFunction.js

@@ -0,0 +1,30 @@
+'use strict'
+
+var fib = require('./fib')
+var max = 100000000
+var start = Date.now()
+
+// create a funcion with the typical error
+// pattern, that delegates the heavy load
+// to something else
+function createNoCodeFunction () {
+  /* eslint no-constant-condition: "off" */
+  var num = 100
+
+  ;(function () {
+    if (null) {
+      // do nothing
+    } else {
+      fib(num)
+    }
+  })()
+}
+
+for (var i = 0; i < max; i++) {
+  createNoCodeFunction()
+}
+
+var time = Date.now() - start
+console.log('Total time', time)
+console.log('Total iterations', max)
+console.log('Iteration/s', max / time * 1000)