Every preview of the forge pictures the Later gate's proposal at desk and phone width, from a seeded gate holding more themes than fit at rest #9212

The owner can see by eye, on any pull, that the Later gate's grouped proposal fits one 390 px screen at rest. #9192 bounded it in code (themes at rest plus one fold line), but no preview had a held page to picture, so #8971's last two boxes could not be ticked.

Done looks like:

• [x] The preview seed (src/spawn/preview-seed.ts) puts a Later gate on preview-admin/sample with held issues across more themes than THEMES_AT_REST in src/web/pages/gate.ts, so the fold line shows.
• [x] PREVIEW_OWNER_LOOKS in src/spawn/preview-looks.ts names /preview-admin/sample/held at desktop and phone, through a named constant as PREVIEW_ITERATIONS_PAGE is; the seed refuses to finish if that page would be a 404 or show no themes.
• [x] A test fails without the change: the owner looks for a forge preview include the held page at both widths, and the seeded page renders exactly THEMES_AT_REST theme lines and one fold line at rest.
• [ ] On this pull's own preview the phone look shows the whole proposal above the fold; the pull description links the desk and phone pictures. bun scripts/design-lint.ts passes.

Files: src/spawn/preview-seed.ts, src/spawn/preview-looks.ts, test/preview-looks.test.ts. Risks: the seed runs in previews only; do not touch forge.json (its looks are at the 24-page limit) or src/http/api.ts. If the phone look shows the proposal taller than one screen, say so on the pull and fix the page in src/web/pages/gate.ts in the same pull.

Reviewed pull #9222 at its head: ticked The preview seed (src/spawn/preview-seed.ts) puts a Later gate on preview-admin/sample with held issues across more themes than THEMES_AT_REST in src/web/pages/gate.ts, so the fold line shows.; PREVIEW_OWNER_LOOKS in src/spawn/preview-looks.ts names /preview-admin/sample/held at desktop and phone, through a named constant as PREVIEW_ITERATIONS_PAGE is; the seed refuses to finish if that page would be a 404 or show no themes.; A test fails without the change: the owner looks for a forge preview include the held page at both widths, and the seeded page renders exactly THEMES_AT_REST theme lines and one fold line at rest.. left open: On this pull's own preview the phone look shows the whole proposal above the fold; the pull description links the desk and phone pictures. bun scripts/design-lint.ts passes. — No desk or phone pictures are linked, so the phone look is unverified and the description has no links..

Left open after pull #9222 landed: 1 unticked item remains (On this pull's own preview the phone look shows the whole proposal above the fold; the pull description links the desk and phone pictures. bun scripts/design-lint.ts passes.). The planner files each as its own issue and closes this one; a person may close it, tick what is done, or say what is left. Until then the crew does not pick it again.

Dropped: the open box is no longer a builder's work. #9222 landed the held page in every preview's owner looks at desk and phone width, so each pull now carries those pictures for the owner to judge by eye. The fold is bounded by a test (THEMES_AT_REST plus one fold line). If a phone look shows the proposal taller than a screen, that is a new issue against src/web/pages/gate.ts.

Replaced by #9249 (correcting my note above: the forge refused the drop, since a person's ask stands behind this). No builder can produce a picture, so the box goes to the forge itself: each look records whether its page scrolls sideways and how many screens tall it is, and the pull names a phone page that does not fit.