fix global.d.ts

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/@types/global.d.ts

@@ -14,9 +14,12 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+type ReactNode = import("react").ReactNode;
+
 interface Window {
     Olm: {
         init: () => Promise<void>;
     };
     mxSendRageshake: (text: string, withLogs?: boolean) => void;
+    matrixChat: ReactNode;
 }