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/tailwindcss/scripts/create-plugin-list.js

@@ -0,0 +1,10 @@
+import { corePlugins } from '../src/corePlugins'
+import fs from 'fs'
+import path from 'path'
+
+let corePluginList = Object.keys(corePlugins)
+
+fs.writeFileSync(
+  path.join(process.cwd(), 'src', 'corePluginList.js'),
+  `export default ${JSON.stringify(corePluginList)}`
+)