Replaces DualValueProps + ProductShowcase with a single before/after
split: a styled <pre> block (the 'without' state) next to the
existing /product/error-detail.png screenshot (the 'with' state).
Three short callouts below.
Section anchor #walkthrough is the target for the Hero's
'See it in action ↓' secondary CTA (added in Task 4).
The 'without' panel is implemented as a styled <pre> per the spec —
no asset production required. A future phase may swap to a recorded
terminal screencap; that swap is a one-component change.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
