Build day. Sam's plan is pinned up: BookNook (add a book, see the list, mark it finished). The agent is briefed, the workflow from last lesson is ready. She could just say go.
But first, a puzzle from her own past. Back in Module 2 she built a page with a real array of books. She typed three in, admired the list, and closed the laptop. Next morning she opened the same page...
Check your intuition
The code is byte-for-byte identical. But the three books she typed are gone. Empty list, count zero. Before we build anything today: what happened to them?
So every real app is three layers deep. The UI: what you see and touch. The logic: what happens when you act. The storage: what survives after you leave. Sam builds them in order, checking each before starting the next.
Layer one: the face. After Module 1, HTML is home turf, so this one is all yours.
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