Exercise 1: A Fully Interactive Figma File Isn't a "Mockup" — Possible Solution
====================================================================

This terminology is inaccurate because a mockup, by this chapter's own
real definition, is a static, visually finished design - it is not
clickable or navigable at all. What the teammate is showing is fully
interactive and simulates a real flow, which is exactly what makes it
a prototype instead, not a mockup, regardless of how polished or
pixel-perfect it looks visually.

The confusion is understandable because fidelity (how polished
something looks) and interactivity (whether it responds to clicks) are
two separate, independent properties, and a mockup and a high-fidelity
prototype can look nearly identical at a glance - a mockup shares that
same real visual polish, but genuinely lacks the click-through
behavior a prototype has. The correct label depends on interactivity,
not visual polish.

ANSWER: This is inaccurate because a mockup is, by definition, static
and non-interactive - what's being shown is a real, interactive
prototype, since it responds to clicks and simulates a real flow. The
confusion happens because visual polish (fidelity) and interactivity
are separate properties; a high-fidelity mockup and a high-fidelity
prototype can look identical at rest, but only one of them actually
responds to interaction.

WHY THIS WORKS AS AN ANSWER
------------------------------
This correctly applies the chapter's own definitions - specifically
that interactivity, not visual fidelity, is what distinguishes a
mockup from a prototype - to the concrete example given.