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/@babel/helpers/LICENSE

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+MIT License
+
+Copyright (c) 2014-present Sebastian McKenzie and other contributors
+Copyright (c) 2014-present, Facebook, Inc. (ONLY ./src/helpers/regenerator* files)
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

node_modules/@babel/helpers/README.md

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+# @babel/helpers
+
+> Collection of helper functions used by Babel transforms.
+
+See our website [@babel/helpers](https://babeljs.io/docs/babel-helpers) for more information.
+
+## Install
+
+Using npm:
+
+```sh
+npm install --save-dev @babel/helpers
+```
+
+or using yarn:
+
+```sh
+yarn add @babel/helpers --dev
+```

node_modules/@babel/helpers/package.json

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+{
+  "name": "@babel/helpers",
+  "version": "7.28.4",
+  "description": "Collection of helper functions used by Babel transforms.",
+  "author": "The Babel Team (https://babel.dev/team)",
+  "homepage": "https://babel.dev/docs/en/next/babel-helpers",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel.git",
+    "directory": "packages/babel-helpers"
+  },
+  "main": "./lib/index.js",
+  "dependencies": {
+    "@babel/template": "^7.27.2",
+    "@babel/types": "^7.28.4"
+  },
+  "devDependencies": {
+    "@babel/generator": "^7.28.3",
+    "@babel/helper-plugin-test-runner": "^7.27.1",
+    "@babel/parser": "^7.28.4",
+    "regenerator-runtime": "^0.14.0"
+  },
+  "engines": {
+    "node": ">=6.9.0"
+  },
+  "type": "commonjs"
+}