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Project CI / AI game creator shell Rust shard 1/4 (pull_request) Failing after 2m38s
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- 根因：`handleResourceSelect` 只改选中、不移动画布，而这张画布是 transform 平移的、资源卡不在任何滚动容器里；既有的 `card.scrollIntoView()` 碰不到滚动祖先，卡在视口外时用户看到的就是「定位过去了但依然见不到素材」 - 新增 `centerResourceCanvasOnResource`：读该卡在当前布局位置表里的 x/y 与卡片尺寸，按 `canvasSize / 2 − 卡中心 × scale` 求视口平移量；缩放保持不变（定位不改用户缩放预期，与 `ensureResourceBookContentVisible` 同口径） - 聚焦链在「选中新资源」那一步之后调用它；`scrollIntoView` 保留（栏目页仍有带滚动条的祖先） - 用例：新增「centers the canvas viewport on the located asset so it is actually visible」，用渲染进 DOM 的真实画布尺寸断言 `viewportX + 卡中心 × scale = 画布中心` - 文档：decision-log 补「失去焦点即收起」与「定位必须让素材真的可见」两条决策；AGC 入口矩阵同步自动收起、入口顺序与定位居中口径 验证：tsc --noEmit 通过；appSurface 全量 441 条通过；变异验证：把定位链里的居中调用摘掉，新用例变红（450 vs 400，正好是画布宽 800 的一半与旧视口之差）