Exercise 2: What the User Actually Sees, Moment by Moment — Possible Solution
====================================================================

The moment the user submits a prompt in the Dashboard Builder's form,
the request goes to the API route, and while that request is in
flight, the renderer shows the static dashboardSpec from earlier in
this chapter rather than a blank screen - the user sees a real, if
generic, dashboard immediately rather than waiting on an empty page.

As the API route's streamText response begins arriving, the
useUIStream hook receives the streamed data, and the renderer
gradually replaces the static fallback with the real, AI-generated
spec as it comes in - the user watches the generic placeholder give
way to the actual result reflecting their own prompt. Once the stream
finishes, the renderer is showing the complete, genuinely
AI-generated spec, drawn using Chapter 2's own registry to turn each
of its component types into real, rendered UI.

ANSWER: The user sees the static dashboardSpec immediately after
submitting (never a blank screen), then watches it get replaced,
piece by piece, by the real AI-generated spec as useUIStream receives
it from the API route's streamed response, ending with the complete,
prompt-specific dashboard once streaming finishes.

WHY THIS WORKS AS AN ANSWER
------------------------------
This correctly traces the full real sequence - static fallback, then
progressive replacement via the stream, then the finished result -
rather than only describing the start and end states.