fix(ui): 异常提示浮层圆角外露白底 → WA_TranslucentBackground

QLabel 默认不透明,QSS border-radius 只画圆角矩形,四角(圆角外三角区)露出 widget 白底色。
加 WA_TranslucentBackground → 圆角外透明(露画布),圆角矩形(深底0.85)正常。

构建:app 链接通过

src/app/main.cpp

@@ -403,6 +403,7 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
     auto* anomalyHint = new QLabel(vtkWidget);
     anomalyHint->setObjectName(QStringLiteral("anomalyHint"));
     anomalyHint->setAttribute(Qt::WA_TransparentForMouseEvents);
+    anomalyHint->setAttribute(Qt::WA_TranslucentBackground);  // 圆角外透明(否则四角露白底)
     geopro::app::applyTokenizedStyleSheet(
         anomalyHint,
         QStringLiteral("QLabel#anomalyHint{background:rgba(10,18,30,0.85);color:#E6ECF5;"