🧪 Experiment: Consider migration to Mantine + Storybook for more systematic approach to frontend dev

...instead of current workflow where feature is directly test-dev-ed into jsx code without planning and modularization

Mantine x NextJS resources: https://mantine.dev/guides/next/
NextJS app router template repo (will no longer use Tailwind): https://github.com/mantinedev/next-app-template/blob/master/package.json