v0.7.1

Beacon 0.7.1: 卡片重新圆回来，并按窗口的圆角对齐 — Cards keep their rounding, sized to the window's corner

• The workspace card's corner is the window's minus the frame, at the window's real radius. 0.7.0 fixed the alignment by assuming the window corner was 10 and shrinking the card to 4 — which is what a 10px window needs, and macOS 26 is not that window: it rounds at about 28. The card is 20 now (28 − 8), so it is rounder than the 14 it started with and the 8px wash keeps one width all the way round. Windows 11 (8) puts the card at 0 and Linux (12) at 4; the arithmetic is the same rule in all three. The card radius is no longer a standalone token, it is derived — so a future system change moves it instead of silently pinching the corner.
  — 0.7.0 把窗口圆角当成 10、把卡片缩到 4，那是 10px 窗口该有的答案；macOS 26 不是那个窗口，它是约 28。现在卡片是 20（28 − 8），比最初的 14 还圆，同时 8px 留白在角上和边上一样宽。Windows 11（8）算出 0，Linux（12）算出 4，三处是同一条规则。卡片圆角不再是一个独立 token，而是推导出来的——系统以后变圆，它跟着走，而不是悄悄把角挤薄。
• A light card gets a 1px hard edge. The window's own edge is a hard system line; a card lifted only by shadows reads as a soft grey smudge at the corner — right curve, wrong material. It is drawn as a zero-blur shadow rather than a border so it cannot take a pixel out of the card's inside.
  — 浅色卡片补了 1px 硬边。窗口那圈是系统画的硬线，只靠阴影浮起来的卡片在角上是一团软灰——弧度对了、质感不对。用零模糊阴影而不是 Border，避免它像内边距一样把卡片内容挤进去 1px。