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/autoprefixer/LICENSE

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+The MIT License (MIT)
+
+Copyright 2013 Andrey Sitnik <andrey@sitnik.ru>
+
+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/autoprefixer/README.md

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+# Autoprefixer [![Cult Of Martians][cult-img]][cult]
+
+<img align="right" width="94" height="71"
+     src="https://postcss.github.io/autoprefixer/logo.svg"
+     title="Autoprefixer logo by Anton Lovchikov">
+
+[PostCSS] plugin to parse CSS and add vendor prefixes to CSS rules using values
+from [Can I Use]. It is recommended by Google and used in Twitter and Alibaba.
+
+Write your CSS rules without vendor prefixes (in fact, forget about them
+entirely):
+
+```css
+::placeholder {
+  color: gray;
+}
+
+.image {
+  width: stretch;
+}
+```
+
+Autoprefixer will use the data based on current browser popularity and property
+support to apply prefixes for you. You can try the [interactive demo]
+of Autoprefixer.
+
+```css
+::-moz-placeholder {
+  color: gray;
+}
+::placeholder {
+  color: gray;
+}
+
+.image {
+  width: -webkit-fill-available;
+  width: -moz-available;
+  width: stretch;
+}
+```
+
+Twitter account for news and releases: [@autoprefixer].
+
+<a href="https://evilmartians.com/?utm_source=autoprefixer">
+<img src="https://evilmartians.com/badges/sponsored-by-evil-martians.svg" alt="Sponsored by Evil Martians" width="236" height="54">
+</a>
+
+[interactive demo]: https://autoprefixer.github.io/
+[@autoprefixer]:    https://twitter.com/autoprefixer
+[Can I Use]:        https://caniuse.com/
+[cult-img]:         https://cultofmartians.com/assets/badges/badge.svg
+[PostCSS]:          https://github.com/postcss/postcss
+[cult]:             https://cultofmartians.com/tasks/autoprefixer-grid.html
+
+
+## Docs
+Read full docs **[here](https://github.com/postcss/autoprefixer#readme)**.

node_modules/autoprefixer/bin/autoprefixer

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+#!/usr/bin/env node
+
+let mode = process.argv[2]
+if (mode === '--info') {
+  process.stdout.write(require('../')().info() + '\n')
+} else if (mode === '--version') {
+  process.stdout.write(
+    'autoprefixer ' + require('../package.json').version + '\n'
+  )
+} else {
+  process.stdout.write(
+    'autoprefix\n' +
+      '\n' +
+      'Options:\n' +
+      '  --info    Show target browsers and used prefixes\n' +
+      '  --version Show version number\n' +
+      '  --help    Show help\n' +
+      '\n' +
+      'Usage:\n' +
+      '  autoprefixer --info\n'
+  )
+}

node_modules/autoprefixer/package.json

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+{
+  "name": "autoprefixer",
+  "version": "10.4.22",
+  "description": "Parse CSS and add vendor prefixes to CSS rules using values from the Can I Use website",
+  "engines": {
+    "node": "^10 || ^12 || >=14"
+  },
+  "keywords": [
+    "autoprefixer",
+    "css",
+    "prefix",
+    "postcss",
+    "postcss-plugin"
+  ],
+  "main": "lib/autoprefixer.js",
+  "bin": "bin/autoprefixer",
+  "types": "lib/autoprefixer.d.ts",
+  "funding": [
+    {
+      "type": "opencollective",
+      "url": "https://opencollective.com/postcss/"
+    },
+    {
+      "type": "tidelift",
+      "url": "https://tidelift.com/funding/github/npm/autoprefixer"
+    },
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/ai"
+    }
+  ],
+  "author": "Andrey Sitnik <andrey@sitnik.ru>",
+  "license": "MIT",
+  "repository": "postcss/autoprefixer",
+  "bugs": {
+    "url": "https://github.com/postcss/autoprefixer/issues"
+  },
+  "peerDependencies": {
+    "postcss": "^8.1.0"
+  },
+  "dependencies": {
+    "browserslist": "^4.27.0",
+    "caniuse-lite": "^1.0.30001754",
+    "fraction.js": "^5.3.4",
+    "normalize-range": "^0.1.2",
+    "picocolors": "^1.1.1",
+    "postcss-value-parser": "^4.2.0"
+  }
+}