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/jiti/bin/jiti.js

@@ -0,0 +1,16 @@
+#!/usr/bin/env node
+
+const { resolve } = require("node:path");
+
+const script = process.argv.splice(2, 1)[0];
+
+if (!script) {
+   
+  console.error("Usage: jiti <path> [...arguments]");
+  process.exit(1);
+}
+
+const pwd = process.cwd();
+const jiti = require("..")(pwd);
+const resolved = (process.argv[1] = jiti.resolve(resolve(pwd, script)));
+jiti(resolved);