fix: 批注工具条默认出现在选区下方（below-first），避开原生选中菜单遮挡 - #48
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原生选中菜单（移动端长按菜单、桌面 Edge/Chrome Copy/Search 浮层）锚定在 选区上沿附近，且原生 UI 恒绘制在页面内容之上，工具条放在上方必被遮挡， z-index 无法补救。placeAbove() 改为下方优先：下方放得下（bottom + 8 后仍 留 8px 边距）即放下方，否则回落上方并保留原有底部钳制。rect 与 window.innerHeight 同为布局视口坐标系，Android 地址栏伸缩时判断依然一致。 双端实测：Windows 11 桌面 Edge + Android 平板（联想 Y700）Edge， DSH 0.1.2-rc.1 + @changfenhuang/dsh-annotation 1.4.8。
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问题
选中助手消息文字后，批注工具条默认出现在选区上方，移动端会被浏览器原生长按菜单（复制/搜索/分享浮层）直接盖住：原生菜单锚定在选区上沿附近，且原生 UI 恒绘制在页面内容之上，工具条无论 z-index 多大都无法显示在其上层。桌面端 Edge/Chrome 的原生 Copy/Search 浮层同理。
复现（移动端 100%）：Android 平板（联想 Y700）+ Edge 打开 DSH Web，长按选中助手回复中任意文字 → 工具条出现在选区上方，与原生长按菜单重叠，无法点击。
根因
placeAbove()目前上方优先（top = rect.top - height - 8，上方放不下才回落下方），而原生选中菜单恰好也锚定选区上沿，两者必然重叠。方案
placeAbove()改为下方优先（below-first）：belowTop = rect.bottom + 8；若belowTop + height <= window.innerHeight - 8则放下方坐标系一致性：
rect（getBoundingClientRect，布局视口坐标）与window.innerHeight（布局视口高）同属布局视口坐标系，Android 地址栏伸缩时两者同步变化，判断在任意状态下都一致（未引入 visualViewport）。测试
@changfenhuang/dsh-annotation1.4.8