Make each entry into a Component

That way, colours can be changed according to contents
Tagging can happen based on the hash tags.
Review the Make Impossible States Impossible by NRI Feldman

No file, test, or entry point is named, so first locate the Elm code that renders each entry and review the referenced “Make Impossible States Impossible” guidance. Define how entries become components, how content controls colours, and how hashtags drive tagging before implementation; done means those behaviours work consistently.

Written by the indexing model from the issue text.