fix: 修复resetView视角和离开地球隐藏tooltip

frontend/public/earth/js/controls.js

@@ -153,11 +153,17 @@ function animateValue(start, end, duration, onUpdate, onComplete) {
 export function resetView(camera) {
   if (!earthObj) return;
   
+  const chinaLat = 40;
+  const chinaLon = -154;
+  
+  const baseTilt = 23.5 * Math.PI / 180;
+  const latRot = chinaLat * Math.PI / 180;
+  const targetRotX = baseTilt + latRot * 0.5;
+  const targetRotY = -(chinaLon * Math.PI / 180);
+  
   const startRotX = earthObj.rotation.x;
   const startRotY = earthObj.rotation.y;
   const startZoom = zoomLevel;
-  const targetRotX = 23.5 * Math.PI / 180;
-  const targetRotY = 0;
   const targetZoom = 1.0;
   
   animateValue(0, 1, 800, (progress) => {
@@ -170,7 +176,7 @@ export function resetView(camera) {
     updateZoomDisplay(zoomLevel, camera.position.z.toFixed(0));
   }, () => {
     zoomLevel = 1.0;
-    showStatusMessage('视图已重置', 'info');
+    showStatusMessage('视角已重置到中国', 'info');
   });
   
   if (typeof window.clearLockedCable === 'function') {

frontend/public/earth/js/main.js

@@ -301,6 +301,8 @@ function onMouseMove(event, camera) {
       showTooltip(event.clientX + 10, event.clientY + 10, 
         `纬度: ${coords.lat}°<br>经度: ${coords.lon}°<br>海拔: ${coords.alt.toFixed(1)} km`);
     }
+  } else {
+    hideTooltip();
   }
   
   if (isDragging) {