fix(javaTest): correct route comparison and layer visibility

javaTest/src/main/java/com/ft546/wcs/shadow/history/visualizer/HistoricalRouteQualityMapper.java

@@ -40,6 +40,12 @@ final class HistoricalRouteQualityMapper {
         }
 
         double historicalDistance = distanceCalculator.pathDistance(map, historicalPath);
+        if (plannedPath.isEmpty()) {
+            // 失败或仍等待的任务没有新路线，不能把“无结果”伪装成算法质量退化。
+            return new HistoricalRouteComparison(
+                    HistoricalRouteComparison.Comparability.COMPARABLE,
+                    null, historicalDistance, null);
+        }
         if (!isValidPath(map, plannedPath)) {
             return new HistoricalRouteComparison(
                     HistoricalRouteComparison.Comparability.COMPARABLE,