zhc
45bb3da47e
Merge master and position submenus with CSS anchors
master 通过 #7700 将 portal 菜单改为 CSS Anchor Positioning，并删除了
`useAnchoredPosition`。本次合并让子菜单跟进同一机制：
- 子卡片以父卡片内一个不随列表滚动、与卡片同尺寸的锚点框为默认锚点，
侧开时默认在右侧、放不下时由 CSS 翻到左侧；单面板模式占据父卡片位置。
- JavaScript 只决定侧开或单面板，并提供当前行在父卡片内的偏移和子卡片
自然高度；两者都是相对尺寸，双指缩放与平移由 CSS 锚点处理。
- 锚点框绕开了 WebKit 的两个问题：锚定到自身由锚点定位的父卡片时不会
在其定位稳定后重新计算；锚定到滚动列表内的行时不计入滚动偏移。
- 删除 `useAnchoredPosition` 及其测试；`menu-submenu-position` 只保留
侧开/单面板判断，相应单测改为验证模式与锚点名。
- 解决 README、测试与 package.json 冲突，沿用 master 的 CSS 锚点说明并
补充子菜单定位描述。
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