fix(ui): 修复复合叠层结果显示界面图标可见性问题

- 移除在模式切换时对图标的冗余显示设置
- 将图标显示逻辑移至完成状态处理块内
- 确保在识别成功后图标正确显示
- 优化UI状态更新时机避免闪烁问题

app/src/main/java/com/nova/brain/glass/ui/CompositeLayupResultActivity.kt

@@ -152,7 +152,6 @@ class CompositeLayupResultActivity : BaseActivity<ActivityCompositeLayupResultBi
         uiMode = mode
         uiHandler.removeCallbacks(layupWorkingRunnable)
         uiHandler.removeCallbacks(completeRunnable)
-        binding.icon.visibility = android.view.View.VISIBLE
         when (mode) {
             UiMode.RECOGNIZE_SUCCESS -> {
                 binding.icon.setImageResource(R.mipmap.ocr_true)
@@ -205,6 +204,7 @@ class CompositeLayupResultActivity : BaseActivity<ActivityCompositeLayupResultBi
                 uiHandler.postDelayed(completeRunnable, 3000L)
             }
         }
+        binding.icon.visibility = android.view.View.VISIBLE
     }
 
     private fun buildInstruction(): String {