fix: keep satellite selection glow whole at limb

docs/technical/en/earth-render-layer-order.md

@@ -101,7 +101,7 @@ Base, tint, land fill and HD surface now use `createEarthSurfaceGeometry()` and
 Cables and landing points share R+0.48, the `earthSurfacePoint` triangle projection and renderOrder=1. Related landing halos use an emphasis attribute in the existing batch, adding no Sprite or draw call. Rounded badges use GPU anchor ray/sphere occlusion: draw the entire billboard when its anchor is visible, otherwise clip it entirely. CPU picking uses the same test to reject rear anchors. Only `icon.badge` layers (including compute and collectors; vessels independently use heading arrows) use this path. BGP event rings use the same whole-anchor front/rear decision: front-side rings disable per-pixel depth testing and sit in the foreground adjacent to the event icon, preventing the Earth from slicing their edges; rear-side anchors hide the entire ring.
 
 
-The `.map-clusters` projection layer uses z-index 8 below HUD and whole-marker occlusion from real surface anchors. Ordinary points retain their Three.js layers; transitioning members render only once in the projection layer. Spider legs use widened transparent hit areas; hover highlights the matching line and child, and both clicks resolve the same business object. Wheel input over projected markers and legs continues to zoom the globe.
+The `.map-clusters` projection layer uses z-index 8 below HUD and whole-marker occlusion from real surface anchors. Ordinary points retain their Three.js layers; transitioning members render only once in the projection layer. Spider legs use widened transparent hit areas; hover highlights the matching line and child, and both clicks resolve the same business object. Wheel input over projected markers and legs continues to zoom the globe. Satellite selection/hover rings and self-glow use the same whole-anchor front/rear decision: front-side overlays render in full, while rear-side overlays hide together so the Earth cannot slice their edges.
 
 Co-located markers share a compact projection stack across categories; screen collisions never merge different locations. A selected child uses projection `z-index: 1000`, while the locked overlay for an unclustered marker uses the shared foreground `renderOrder >= 100`, so focus stays on top across layers; clearing focus restores stable ID order. The aggregate badge stays below a selected child during its opening tween. `icon_presentation_screen` lets detail connectors follow display offsets while markers retain their real anchors. Ownership changes immediately rebuild the corresponding GPU batch.
 

docs/technical/zh/earth-render-layer-order.md

@@ -103,7 +103,7 @@ Earth 的地表不是单一 mesh，而是多层近似同心球：基座球、海
 海缆和登陆点现在统一使用 R+0.48 及 `earthSurfacePoint` 三角表面投影，并保持 renderOrder=1。登陆点关联光晕进入原实例批次的 emphasis 属性，不增加独立 Sprite 或 draw call。侧面的完整圆角徽标采用 GPU 锚点射线/球体遮挡：锚点可见则整个 billboard 绘制，锚点被地球挡住则整块裁除。CPU 拾取使用同样的射线判断，避免点到背面图标。该路径只作用于 `icon.badge` 层（含算力、观测站；船舶独立使用航向箭头）。BGP 事件圆环同样按锚点做整块前后判断，前面锚点的圆环关闭逐像素深度测试并置于事件图标邻近前景层，避免圆环边缘被地球切断；背面锚点整圈隐藏。
 
 
-聚合投影层 `.map-clusters` 的 z-index 为 8，低于 HUD；以真实地表锚点做整标遮挡。普通点仍使用原 Three.js 图层，过渡中的成员只在投影层显示一次，避免双图标。Spiderfy 引线有透明加宽命中区域，悬停联动高亮引线与子点，点击返回同一业务对象；滚轮在图标与引线上继续缩放地球。
+聚合投影层 `.map-clusters` 的 z-index 为 8，低于 HUD；以真实地表锚点做整标遮挡。普通点仍使用原 Three.js 图层，过渡中的成员只在投影层显示一次，避免双图标。Spiderfy 引线有透明加宽命中区域，悬停联动高亮引线与子点，点击返回同一业务对象；滚轮在图标与引线上继续缩放地球。卫星选中/悬停环和自发光也按卫星锚点做整块前后判断，前侧完整显示，背侧整组隐藏，避免环或光晕被地表切边。
 
 跨图层同坐标/极近坐标标记在同一投影层内紧凑堆叠，不以屏幕碰撞合并不同地点；选中项使用投影子点 `z-index: 1000`，普通未聚合图标的锁定覆盖层使用共享的前景 `renderOrder >= 100`，因此跨图层重叠时仍由焦点对象在最上层；取消后恢复稳定 ID 顺序。聚合徽标在展开过渡期间保持低于选中子点。`icon_presentation_screen` 仅供详情引线跟随显示偏移，真实锚点仍由原 marker 持有；隐藏状态变化立即重建对应 GPU 批次。
 

frontend/public/earth/js/satellites.js

@@ -1279,10 +1279,21 @@ export function isSatelliteFrontFacing(index, camera = cameraRef) {
   );
 }
 
+function updateSatelliteOverlayVisibility() {
+  const lockedVisible =
+    lockedSatelliteIndex === null || isSatelliteFrontFacing(lockedSatelliteIndex);
+  const hoveredVisible =
+    hoveredSatelliteIndex === null || isSatelliteFrontFacing(hoveredSatelliteIndex);
+  if (lockedRingSprite) lockedRingSprite.visible = lockedVisible;
+  if (lockedDotSprite) lockedDotSprite.visible = lockedVisible;
+  if (lockedHaloMesh) lockedHaloMesh.visible = lockedVisible;
+  if (hoverRingSprite) hoverRingSprite.visible = hoveredVisible;
+}
+
 function createLockedHaloMaterial(color = "#ffbf47") {
   return new THREE.ShaderMaterial({
     transparent: true,
-    depthTest: true,
+    depthTest: false,
     depthWrite: false,
     side: THREE.DoubleSide,
     uniforms: {
@@ -1724,7 +1735,7 @@ function showSelfGlowStyle(position, color = "#ffd25a") {
     color: new THREE.Color(color),
     transparent: true,
     opacity: 0.96,
-    depthTest: true,
+    depthTest: false,
     depthWrite: false,
     side: THREE.DoubleSide,
   });
@@ -1797,7 +1808,7 @@ function createRingSprite(position, isLocked = false, color = "#ffffff") {
     map: ringTexture,
     transparent: true,
     opacity: 0.8,
-    depthTest: true,
+    depthTest: false,
     depthWrite: false,
     alphaTest: 0.01,
     sizeAttenuation: false,
@@ -1845,6 +1856,7 @@ export function showHoverRing(position, isLocked = false) {
     const legendColor = getSatelliteLegendRule(lockedProps).color;
     hideLockedRing();
     lockedRingSprite = createRingSprite(position, true, legendColor);
+    updateSatelliteOverlayVisibility();
     updateLockedMarkerVisual(isLockedSatelliteHovered());
     const presentationMode = getSatellitePresentationMode(lockedProps);
     if (
@@ -1865,6 +1877,7 @@ export function showHoverRing(position, isLocked = false) {
   hideHoverRings();
   const hoverColor = getSatelliteLegendRule(satelliteData[hoveredSatelliteIndex]?.properties).color;
   hoverRingSprite = createRingSprite(position, false, hoverColor);
+  updateSatelliteOverlayVisibility();
   return hoverRingSprite;
 }
 
@@ -1959,6 +1972,7 @@ export function updateLockedRingPosition(position) {
   if (lockedIridiumFootprintMesh) {
     updateIridiumReservedStyle(position);
   }
+  updateSatelliteOverlayVisibility();
 }
 
 export function updateHoverRingPosition(position) {
@@ -1969,6 +1983,7 @@ export function updateHoverRingPosition(position) {
       SATELLITE_CONFIG.ringSize,
       1,
     );
+    updateSatelliteOverlayVisibility();
   }
 }