v0.14: 截图美化素材迁移 + 散落改动归集

主线：从 PPT skill port 9 张截图舞台底 WebP，补齐 v0.11 当时只迁规则未迁素材的缺口。

新增
- assets/screenshot-backgrounds/style-a/ · 5 张 Editorial 底
  dune / forest-ink / indigo-porcelain / kraft-paper / monocle-classic
- assets/screenshot-backgrounds/style-b/ · 4 张 Swiss 底
  ikb-dot-gradient / lemon-green-dot-shadow / lemon-grid / safety-orange-halftone

模板
- template-editorial-card.html: 加 5 条 .frame-shot.bg-asset-* 规则
- template-swiss-card.html: 加 4 条 .frame-shot.bg-asset-* 规则
  两侧都带 fallback 实色，素材未加载时背景不透

文档
- screenshot-treatment.md: 新增 Solid vs Asset 小节 + 两张对照表 + 4 条 rules of thumb
  + 两条新 cheat-sheet recipe，明确路径假设与 accent 绑定
- HANDOFF.md: 版本号 v0.14，目录树加 screenshot-backgrounds/，
  写清"素材迁移不是规则迁移"的边界（未引入 PPT 原 7 参数语义系统）

顺带归集本轮工作期间累积的散落改动（PRODUCT/SKILL/category-cookbook/
components/content-planning/map-component/production-workflow/
qa-checklist/style-system/validate-social-deck）一并入库，避免长期挂在 dirty tree。

references/category-cookbook.md

@@ -11,7 +11,7 @@ Per-category cheat sheet for the 11 most common Rednote (小红书) content type
 
 This is a routing document. When the user names a category, find the row here and start from the listed recipes instead of building from a blank file.
 
-For any category, if a poster has a full-bleed image with text on top, also follow `image-overlay.md` (mask + subject avoidance).
+For any category, if a poster has a full-bleed image with text on top, also follow `image-overlay.md` (photo qualification, localized tint fallback, and subject avoidance).
 
 ---
 
@@ -21,7 +21,7 @@ For any category, if a poster has a full-bleed image with text on top, also foll
 
 - **Recipes**: M01 (text-led cover, no photo dominance) **or M16 (image-led cover, when the user has 1+ great photos)**, M02 (field-note photo), M11 (marginalia essay), M07 (closing note), S11 (itinerary ledger). For image-heavy submissions use the M16 → S11/M05 → M02 sequence in `references/content-planning.md`.
 - **Style mode**: Editorial × kraft-paper / dune (warm-tone destinations) or × forest-ink (mountain/wilderness). Swiss × IKB works for "trip data report" style.
-- **Text scheme**: Text beside image is the default. Cover uses text-on-image with a vertical falloff mask. Body pages use photo + caption pairs (field-note style).
+- **Text scheme**: Text beside image is the default. Cover can use text-on-image only when the photo has a quiet zone; add localized tint only if the thumbnail check fails. Body pages use photo + caption pairs (field-note style).
 - **Image source**: User photos > Pexels (for China destinations — supports Chinese keyword search) > Unsplash (`/s/photos/<destination>`, best for overseas / English keywords) > Flickr CC (`license=2,3,4,5,6,9`, when you need documentary "real trip" feel rather than postcard polish). Always log to `assets/SOURCES.md`.
 - **Content shape**: 5-7 pages. Cover (destination + dates) → atmosphere photo + lead → itinerary ledger → 2-3 field notes (one location each) → closing quote / next-stop teaser.
 - **Pitfalls**: Generic "best places in X city" listicle voice. Cure: keep one specific date / weather / mileage detail per page to anchor it as observed, not researched.
@@ -52,7 +52,7 @@ See: `local-tests/demo-image-01-yading/` for a reference build.
 
 - **Recipes**: M01 (cover with full-bleed art), M08 (boss tier ledger), S07 (takeaway ledger), S11 (chapter timeline), M15 (build before/after).
 - **Style mode**: Editorial dark (ink-classic with paper inverted to near-black) for atmospheric games (黑神话 / Elden Ring). Swiss for esports / competitive data ("胜率 / KDA / 出装").
-- **Text scheme**: Text-on-image is standard for game covers because game art is the primary draw. Mask is mandatory (see `image-overlay.md` Rule 1A vertical falloff).
+- **Text scheme**: Text-on-image is standard for game covers because game art is the primary draw. Use subject mapping and thumbnail checks from `image-overlay.md`; add a localized, image-toned tint only where the title needs support.
 - **Image source**: Wallhaven JSON API (see SKILL.md Step 6) for keyword pulls, official screenshots for specific moments. Always disclose copyright risk and log to `SOURCES.md`. If user opts out of attribution, do not crop the credit out of the image itself.
 - **Content shape**: 4-6 pages. Cover (game name + playtime) → first impression page → chapter-by-chapter ledger → memorable boss / scene page → verdict.
 - **Pitfalls**: