feat(site): rework 19 marketing showcases for composition diversity

Measured convergence before: split hero 13/19, top-bar nav 19/19,
one-line notice footer 14/19, body Pretendard 17/21, 10 similarity
pairs above 0.78. Each showcase got a pre-assigned hero family, nav
form, footer form, type pair, background, accent hue, radius, motion
grammar and material from outputs/rework-2026-10-06/plan.md; direction
cards and the chosen reason are recorded in every design.md.

After: 0 similarity warnings, 19 distinct display faces, 7 hero
families, 5 nav forms, 5 footer forms, no scroll reveals, 5 showcases
with SVG filter materials. Example contact values replace bracket
placeholders under the existing fictional-brand notices. Thumbnails,
OG images, card copy and three e2e assertions updated; dead CSS in
dure-enrollment and hannam-jari removed; similarity.mjs learns the new
font families.

apps/site/tools/showcase-duo-e2e.mjs

@@ -422,6 +422,8 @@ async function setEstateConditions(page, { trade, budget, minArea, moveIn, parki
 
 async function submitEstate(page) {
   await page.click("[data-condition-form] button[type='submit']");
+  // 격자 재정렬이 View Transitions 로 바뀌어, 전환이 끝날 때까지 기다린다(전환 중에는 문서가 히트테스트에서 빠진다).
+  await page.waitForFunction(() => !document.documentElement.matches(":active-view-transition"), { timeout: 2000 }).catch(() => {});
   await new Promise((resolve) => setTimeout(resolve, 180));
 }