便签形状：更圆角、指向箭头更小更简洁

src/scene/CesiumGlobe.js

@@ -55,7 +55,7 @@ function sphericalAreaKm2(polys) {
 // 生成便签 canvas：黄底圆角 + 左侧箭头 + 黑色加粗文字（整张图，箭头尖端指向坐标）
 // 选中态：先描粗边再填充，得到一条干净的 2px 外描边（四周预留 B 的 padding 防止裁切）
 function makeStickyNote(text, fontSize, selected = false) {
-  const padX = 8, padY = 5, radius = 7, arrowW = 10, arrowH = 14, S = 2, B = 2; // S: 2x 超采样，B: 边框预留
+  const padX = 8, padY = 5, radius = 9, arrowW = 7, arrowH = 10, S = 2, B = 2; // S: 2x 超采样，B: 边框预留
   const font = `bold ${fontSize}px "Noto Serif SC", "Songti SC", "STSong", "SimSun", Georgia, serif`;
   const m = document.createElement('canvas');
   const mctx = m.getContext('2d');