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-network-app/node_modules/postcss/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-network-app/node_modules/postcss/README.md

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+# PostCSS
+
+<img align="right" width="95" height="95"
+     alt="Philosopher’s stone, logo of PostCSS"
+     src="https://postcss.org/logo.svg">
+
+PostCSS is a tool for transforming styles with JS plugins.
+These plugins can lint your CSS, support variables and mixins,
+transpile future CSS syntax, inline images, and more.
+
+PostCSS is used by industry leaders including Wikipedia, Twitter, Alibaba,
+and JetBrains. The [Autoprefixer] and [Stylelint] PostCSS plugins are some of the most popular CSS tools.
+
+---
+
+<img src="https://cdn.evilmartians.com/badges/logo-no-label.svg" alt="" width="22" height="16" />  Built by
+ <b><a href="https://evilmartians.com/devtools?utm_source=postcss&utm_campaign=devtools-button&utm_medium=github">Evil Martians</a></b>, go-to agency for <b>developer tools</b>.
+
+---
+
+[Abstract Syntax Tree]: https://en.wikipedia.org/wiki/Abstract_syntax_tree
+[Evil Martians]:        https://evilmartians.com/?utm_source=postcss
+[Autoprefixer]:         https://github.com/postcss/autoprefixer
+[Stylelint]:            https://stylelint.io/
+[plugins]:              https://github.com/postcss/postcss#plugins
+
+
+## Docs
+Read full docs **[here](https://postcss.org/)**.

node-network-app/node_modules/postcss/package.json

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+{
+  "name": "postcss",
+  "version": "8.5.6",
+  "description": "Tool for transforming styles with JS plugins",
+  "engines": {
+    "node": "^10 || ^12 || >=14"
+  },
+  "exports": {
+    ".": {
+      "import": "./lib/postcss.mjs",
+      "require": "./lib/postcss.js"
+    },
+    "./lib/at-rule": "./lib/at-rule.js",
+    "./lib/comment": "./lib/comment.js",
+    "./lib/container": "./lib/container.js",
+    "./lib/css-syntax-error": "./lib/css-syntax-error.js",
+    "./lib/declaration": "./lib/declaration.js",
+    "./lib/fromJSON": "./lib/fromJSON.js",
+    "./lib/input": "./lib/input.js",
+    "./lib/lazy-result": "./lib/lazy-result.js",
+    "./lib/no-work-result": "./lib/no-work-result.js",
+    "./lib/list": "./lib/list.js",
+    "./lib/map-generator": "./lib/map-generator.js",
+    "./lib/node": "./lib/node.js",
+    "./lib/parse": "./lib/parse.js",
+    "./lib/parser": "./lib/parser.js",
+    "./lib/postcss": "./lib/postcss.js",
+    "./lib/previous-map": "./lib/previous-map.js",
+    "./lib/processor": "./lib/processor.js",
+    "./lib/result": "./lib/result.js",
+    "./lib/root": "./lib/root.js",
+    "./lib/rule": "./lib/rule.js",
+    "./lib/stringifier": "./lib/stringifier.js",
+    "./lib/stringify": "./lib/stringify.js",
+    "./lib/symbols": "./lib/symbols.js",
+    "./lib/terminal-highlight": "./lib/terminal-highlight.js",
+    "./lib/tokenize": "./lib/tokenize.js",
+    "./lib/warn-once": "./lib/warn-once.js",
+    "./lib/warning": "./lib/warning.js",
+    "./package.json": "./package.json"
+  },
+  "main": "./lib/postcss.js",
+  "types": "./lib/postcss.d.ts",
+  "keywords": [
+    "css",
+    "postcss",
+    "rework",
+    "preprocessor",
+    "parser",
+    "source map",
+    "transform",
+    "manipulation",
+    "transpiler"
+  ],
+  "funding": [
+    {
+      "type": "opencollective",
+      "url": "https://opencollective.com/postcss/"
+    },
+    {
+      "type": "tidelift",
+      "url": "https://tidelift.com/funding/github/npm/postcss"
+    },
+    {
+      "type": "github",
+      "url": "https://github.com/sponsors/ai"
+    }
+  ],
+  "author": "Andrey Sitnik <andrey@sitnik.ru>",
+  "license": "MIT",
+  "homepage": "https://postcss.org/",
+  "repository": "postcss/postcss",
+  "bugs": {
+    "url": "https://github.com/postcss/postcss/issues"
+  },
+  "dependencies": {
+    "nanoid": "^3.3.11",
+    "picocolors": "^1.1.1",
+    "source-map-js": "^1.2.1"
+  },
+  "browser": {
+    "./lib/terminal-highlight": false,
+    "source-map-js": false,
+    "path": false,
+    "url": false,
+    "fs": false
+  }
+}