fix: 修复第二次进入时UI不显示和转场自动触发的问题

- 在 init3DScene() 中清除 uiLayer 和 hint 的内联 opacity 样式
- 在 SceneManager 中保存事件处理器引用
- 在 dispose() 中正确移除所有事件监听器
- 防止事件监听器重复绑定导致的意外触发

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

js/scene/SceneManager.js

@@ -154,20 +154,29 @@ export class SceneManager {
 
     // 绑定事件
     bindEvents() {
+        // 保存事件处理器引用，以便后续移除
+        this.eventHandlers = {
+            mouseMove: (e) => this.onMouseMove(e),
+            mouseDown: () => this.onMouseDown(),
+            touchMove: (e) => this.onTouchMove(e),
+            touchStart: (e) => this.onTouchStart(e),
+            resize: () => this.onWindowResize()
+        };
+
         // 鼠标移动
-        window.addEventListener('mousemove', (e) => this.onMouseMove(e));
+        window.addEventListener('mousemove', this.eventHandlers.mouseMove);
 
         // 鼠标点击
-        window.addEventListener('mousedown', () => this.onMouseDown());
+        window.addEventListener('mousedown', this.eventHandlers.mouseDown);
 
         // 触摸移动（移动端）
-        window.addEventListener('touchmove', (e) => this.onTouchMove(e), { passive: false });
+        window.addEventListener('touchmove', this.eventHandlers.touchMove, { passive: false });
 
         // 触摸点击（移动端）
-        window.addEventListener('touchstart', (e) => this.onTouchStart(e));
+        window.addEventListener('touchstart', this.eventHandlers.touchStart);
 
         // 窗口resize
-        window.addEventListener('resize', () => this.onWindowResize());
+        window.addEventListener('resize', this.eventHandlers.resize);
     }
 
     // 鼠标移动事件
@@ -290,6 +299,15 @@ export class SceneManager {
 
     // 销毁场景
     dispose() {
+        // 移除事件监听器，防止内存泄漏和重复触发
+        if (this.eventHandlers) {
+            window.removeEventListener('mousemove', this.eventHandlers.mouseMove);
+            window.removeEventListener('mousedown', this.eventHandlers.mouseDown);
+            window.removeEventListener('touchmove', this.eventHandlers.touchMove);
+            window.removeEventListener('touchstart', this.eventHandlers.touchStart);
+            window.removeEventListener('resize', this.eventHandlers.resize);
+        }
+
         if (this.starSystem) this.starSystem.dispose();
         if (this.earthModel) this.earthModel.dispose();
         if (this.renderer) {