harden(data): 句柄 emit done 移出 try + catch(...) 兜底 + parse 抛异常测试（评审 I-1/M-5）

src/data/api/DatasetLoadHandles.cpp

@@ -14,11 +14,19 @@ ApiChartLoad::ApiChartLoad(geopro::net::ApiBatch* batch, Parser parse, QObject*
     QObject::connect(batch, &geopro::net::ApiBatch::succeeded, this,
                      [this](const QList<geopro::net::ApiResponse>& resps) {
         if (aborted_) return;                       // §5.0
+        ChartParts parts;
         try {
-            emit done(parse_(resps));
+            parts = parse_(resps);                  // 仅解析在 try 内：下游 done 处理器抛出不应误报为解析失败
         } catch (const std::exception& e) {
             emit failed(QString::fromUtf8(e.what()));
+            deleteLater();
+            return;
+        } catch (...) {                             // 非 std 异常跨信号槽会 terminate，兜底转 failed
+            emit failed(QStringLiteral("解析失败：未知异常"));
+            deleteLater();
+            return;
         }
+        emit done(parts);
         deleteLater();
     });
     QObject::connect(batch, &geopro::net::ApiBatch::failed, this,
@@ -41,11 +49,19 @@ ApiGridLoad::ApiGridLoad(geopro::net::ApiBatch* batch, Parser parse, QObject* pa
     QObject::connect(batch, &geopro::net::ApiBatch::succeeded, this,
                      [this](const QList<geopro::net::ApiResponse>& resps) {
         if (aborted_) return;
+        GridParts parts;
         try {
-            emit done(parse_(resps));
+            parts = parse_(resps);                  // 仅解析在 try 内：下游 done 处理器抛出不应误报为解析失败
         } catch (const std::exception& e) {
             emit failed(QString::fromUtf8(e.what()));
+            deleteLater();
+            return;
+        } catch (...) {
+            emit failed(QStringLiteral("解析失败：未知异常"));
+            deleteLater();
+            return;
         }
+        emit done(parts);
         deleteLater();
     });
     QObject::connect(batch, &geopro::net::ApiBatch::failed, this,

tests/data/test_dataset_load_handles.cpp

@@ -1,4 +1,5 @@
 #include <gtest/gtest.h>
+#include <stdexcept>
 #include <QSignalSpy>
 #include "api/DatasetLoadHandles.hpp"
 #include "net/FakeApiCall.hpp"
@@ -40,6 +41,19 @@ TEST(DatasetLoadHandles, ChartLoadEmitsFailedOnBatchFailure) {
     EXPECT_EQ(failSpy.count(), 1);
 }
 
+TEST(DatasetLoadHandles, ChartLoadEmitsFailedWhenParseThrows) {
+    auto* a = new FakeApiCall;
+    auto* batch = new ApiBatch({a}, isFailure);
+    auto* load = new ApiChartLoad(batch, [](const QList<ApiResponse>&) -> ChartParts {
+        throw std::runtime_error("parse boom");
+    });
+    QSignalSpy doneSpy(load, &ChartLoad::done);
+    QSignalSpy failSpy(load, &ChartLoad::failed);
+    a->fire(ok());                 // batch 成功 → parse 抛异常 → failed（emit done 已移出 try）
+    EXPECT_EQ(doneSpy.count(), 0);
+    EXPECT_EQ(failSpy.count(), 1);
+}
+
 TEST(DatasetLoadHandles, GridLoadAbortSuppressesLateDone) {
     auto* a = new FakeApiCall;
     auto* batch = new ApiBatch({a}, isFailure);