Maintainability is less about a perfect folder structure and more about making the next change safe and understandable.
Name things by purpose
Components should explain why they exist. A name like ProjectCard says more than a generic Card, especially once a codebase grows.
Keep data close to its owner
Put content models, route helpers, and rendering logic where future contributors can find them without chasing through unrelated files.
Prefer small, testable changes
When a feature is broken into focused pieces, it is easier to review, validate, and replace later without surprising side effects.