## Summary
Reworks the product page's closing section, and in doing so makes every
signoff closer width-driven.
### 1. Replace the Demo section with a register Signoff (`6a5f0c34bf`)
The product page ended on a static `AppPreview` mockup ("Try it live").
Swap it for the shared `Signoff` closer — a focused register CTA, the
same component the customers / why-twenty / partners pages use — so the
page ends by driving sign-ups instead of re-showing the product.
- New `ProductSignoff`: heading "Start moving faster today.", a
supporting line, and the **Get started + Talk to us** pair (matching
`CustomersCatalogSignoff`). Uses `SITE_URLS.appWelcome` per the
site-urls rule rather than inlining the URL.
- Removes the now-unused `product-demo` section and its 192KB background
asset.
### 2. Make Signoff headings width-driven (`0365c0d2ea`)
The signoff headings forced their two-line break with a literal `\n` in
the translated string — against the site's typography principle (fluid
type + `text-wrap: balance`, no `<br>`).
- `Signoff` now carries one default **`615px`** heading measure; all
five closers drop `\n`.
- The width was **measured, not guessed**: each heading was rendered
headlessly in the real production fonts (Aleo 300 body, Host Grotesk 300
accent — each heading mixes both) at the desktop size with `text-wrap:
balance`, then I found the common window where every heading breaks
identically: whyTwenty `[565–820]`, customers `[425–800]`, partner
`[380–730]`, product `[380–660]` — `615` sits in all of them. Each was
then verified to reproduce its exact current break at 615px.
- **Affects 4 other pages** (why-twenty, customers, customers/[slug],
partners) — all verified to render identically, and headings now reflow
on narrow viewports instead of being pinned by `\n`.
- Drops the one-off `headingMaxWidth` prop (now unused).
## Test plan
- oxfmt, oxlint, check-conventions, typecheck — all green.
- Headless measurement confirms all five signoff headings reproduce
their current desktop break at 615px (no visual regression).
- Visually confirmed the product closer and the four sibling signoffs.
Abdullah.
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