Nielsen heuristic violated: User Control and Freedom.
In src/components/Content.tsx, the Learn flow creates a navigation dead end. Users cannot leave the learning experience mid-flow, and the final module page shows only a disabled “Next” button with no clear way to exit or complete the process. This traps the user inside the learning navigation. A proper completion action should be provided that redirects to the main page (/), similar to the navbar logo behavior, so users can finish or leave the flow at any time.