Idling.app: NextJS TypeScript with SSR for peer review

I hope I am doing this right. It has been super hard to get anyone to even glance at my work.

Some background: laid off software engineer with eight years of experience almost entirely self-taught picks up a new hobby to retain sanity while applying to a dozen jobs every day for several months with little to no responses.

I love critical reviews; I am a perfectionist. Please, don’t be an a** about it. I am a newbie regarding NextJS; I picked it up around four months ago. I have close to five years of experience with TypeScript, close to two years of experience with Angular, and roughly seven years of experience with React.

On to the good stuff.
My codebase is open source and can be viewed here: https://github.com/Underwood-Inc/idling.app__UI
The About section contains a link to the live website consuming that codebase. Test coverage is the next priority task I will tackle when v1.0.0 is released (it will involve some refactoring to ensure accessibility standards are met). No new features will be added until then.

The goals of the peer review I am requesting are the code itself, the techniques used for NextJS (I’m new), and any other improvements you think are worthwhile.

I will be relocating over the next month, so I may be slow to respond.