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/@babel/plugin-transform-react-jsx-self/package.json

@@ -0,0 +1,35 @@
+{
+  "name": "@babel/plugin-transform-react-jsx-self",
+  "version": "7.27.1",
+  "description": "Add a __self prop to all JSX Elements",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/babel/babel.git",
+    "directory": "packages/babel-plugin-transform-react-jsx-self"
+  },
+  "homepage": "https://babel.dev/docs/en/next/babel-plugin-transform-react-jsx-self",
+  "license": "MIT",
+  "publishConfig": {
+    "access": "public"
+  },
+  "main": "./lib/index.js",
+  "keywords": [
+    "babel-plugin"
+  ],
+  "dependencies": {
+    "@babel/helper-plugin-utils": "^7.27.1"
+  },
+  "peerDependencies": {
+    "@babel/core": "^7.0.0-0"
+  },
+  "devDependencies": {
+    "@babel/core": "^7.27.1",
+    "@babel/helper-plugin-test-runner": "^7.27.1",
+    "@babel/plugin-syntax-jsx": "^7.27.1"
+  },
+  "engines": {
+    "node": ">=6.9.0"
+  },
+  "author": "The Babel Team (https://babel.dev/team)",
+  "type": "commonjs"
+}