feat(P4): precompute移植+app.js sources双向回填+回归1003/1003+验收体积/文件/data.json

site/details/buttongroup.json

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+{"slug":"buttongroup","contract":{"variants":["基础组合","单选（视图切换）","多选（筛选条件）","可分隔 · 小尺寸"],"dims":[{"name":"selection","values":["none","single","multiple"]},{"name":"split","values":["connected","separated"]},{"name":"size","values":["large","medium","small"]}],"unknowns":["选中态的视觉表现（背景 vs 边框）","分隔样式的具体形态"],"anatomy":{"group":"按钮组容器","corner":"按钮之间无缝连接，仅首尾有圆角","active":"选中项（单选/多选）"},"doNot":["下拉按钮组合模式"],"usage":["多个按钮组合","可选中（单选/多选）、可分隔","按钮之间无缝连接，仅首尾有圆角","支持尺寸统一、禁用","适用于视图切换、筛选条件"],"structure":{"corner":"仅首尾圆角","join":"无缝连接"}},"specLines":["- 多个按钮组合","- 可选中（单选/多选）、可分隔","- 按钮之间无缝连接，仅首尾有圆角","- 支持尺寸统一、禁用","- 适用于视图切换、筛选条件"]}