build(deps): add react-router-dom

Install react-router-dom to support client-side navigation. This is a prerequisite for implementing the multi-step authentication flow and other routed features.

Additionally, this commit includes minor copy improvements to the password reset forms for better clarity.

node_modules/react-router/README.md

@@ -0,0 +1,7 @@
+`react-router` is the primary package in the React Router project.
+
+## Installation
+
+```sh
+npm i react-router
+```