feat(ela): C VTK 视口背景随主题 + A 浮层勾选框 Ela 化

- vtkBackground(): 取 ElaTheme 窗口底色; CentralScene/详情渲染器初始用它; 切主题时中央+详情重设+刷新
- 浮层图层勾选(帘面/体素/切片/地形) → ElaCheckBox
- 说明: 自定义 chrome(工作空间/项目切换器/图标按钮/PanelHeader tab/工具条)保留并随主题(强换 Ela 会丢设计); 状态栏由 QSS 随主题

src/app/CentralScene.cpp

@@ -6,6 +6,7 @@
 
 #include "CameraPreset.hpp"
 #include "Scene.hpp"
+#include "Theme.hpp"
 #include "actors/CurtainActor.hpp"
 #include "actors/MapLineActor.hpp"
 #include "geo/GeoLocalFrame.hpp"
@@ -18,7 +19,11 @@ void rebuildCentralScene(geopro::render::Scene& scene, vtkRenderer* renderer,
                          const geopro::core::GeoLocalFrame& frame, double verticalExaggeration) {
     scene.clear();
     const bool is2D = (mode == ViewMode::Map2D);
-    renderer->SetBackground(is2D ? 0.96 : 1.0, is2D ? 0.97 : 1.0, is2D ? 0.99 : 1.0);
+    (void)is2D;
+    // 背景随主题（取 ElaTheme 窗口底色），暗色下不再是刺眼白底。
+    double bgR, bgG, bgB;
+    geopro::app::vtkBackground(bgR, bgG, bgB);
+    renderer->SetBackground(bgR, bgG, bgB);
 
     for (const auto& s : sections) {
         if (is2D) {

src/app/Theme.cpp

@@ -467,6 +467,14 @@ bool isDarkTheme()
     return eTheme->getThemeMode() == ElaThemeType::Dark;
 }
 
+void vtkBackground(double& r, double& g, double& b)
+{
+    const QColor c = roleColor(isDarkTheme(), ElaThemeType::WindowBase);
+    r = c.redF();
+    g = c.greenF();
+    b = c.blueF();
+}
+
 void applyThemedStyleSheet(QWidget* w, const QString& designQss)
 {
     if (!w) return;

src/app/Theme.hpp

@@ -93,6 +93,9 @@ void applyTheme(QApplication& app);
 // 当前 ElaTheme 是否暗色（供内联样式判断）。
 bool isDarkTheme();
 
+// VTK 渲染器背景色（随当前主题，取 ElaTheme 窗口底色）。写入 r/g/b（0–1）。
+void vtkBackground(double& r, double& g, double& b);
+
 // 把一段「浅色设计稿 QSS」按当前 ElaTheme 配色着色应用到 widget，并随明/暗切换自动重着色。
 // 用于 TopBar/PanelHeader/浮层 等带内联 setStyleSheet 的自定义 chrome——让它们也跟随主题
 // （设计稿里用浅色令牌 #1F2A3D/#FFFFFF/#2D6CB5… 书写即可，与全局 QSS 同一套角色映射）。

src/app/main.cpp

@@ -62,6 +62,7 @@
 #include <DockWidget.h>
 
 #include <ElaApplication.h>
+#include <ElaCheckBox.h>
 #include <ElaDef.h>
 #include <ElaTheme.h>
 #include <ElaWindow.h>
@@ -348,13 +349,13 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
                                    "padding-bottom:3px;font-size:%2px;")
                         .arg(geopro::app::type::kWeightSemibold)
                         .arg(geopro::app::type::kTitle));
-    auto* chkCurtain = new QCheckBox(QStringLiteral("帘面（断面墙）"));
+    auto* chkCurtain = new ElaCheckBox(QStringLiteral("帘面（断面墙）"));
     chkCurtain->setChecked(true);
-    auto* chkVoxel = new QCheckBox(QStringLiteral("体素（dd_voxel）"));
+    auto* chkVoxel = new ElaCheckBox(QStringLiteral("体素（dd_voxel）"));
     chkVoxel->setChecked(false);
-    auto* chkTerrain = new QCheckBox(QStringLiteral("地形（DEM+影像）"));
+    auto* chkTerrain = new ElaCheckBox(QStringLiteral("地形（DEM+影像）"));
     chkTerrain->setChecked(false);
-    auto* chkSlice = new QCheckBox(QStringLiteral("切片（dd_slice）"));
+    auto* chkSlice = new ElaCheckBox(QStringLiteral("切片（dd_slice）"));
     chkSlice->setChecked(false);
     if (!crs) {  // PROJ 不可用 → 体素/切片/地形层(都需配准)禁用并提示
         const QString tip = QStringLiteral("PROJ 数据(proj.db)缺失，配准不可用");
@@ -433,12 +434,27 @@ void buildWorkbench(QMainWindow& window, geopro::data::LocalSampleRepository& re
     auto* detailWidget = new QVTKOpenGLStereoWidget();
     vtkNew<vtkGenericOpenGLRenderWindow> detailRenderWindow;
     vtkNew<vtkRenderer> detailRenderer;
-    detailRenderer->SetBackground(1.0, 1.0, 1.0);  // 白底
+    {
+        double r, g, b;
+        geopro::app::vtkBackground(r, g, b);  // 背景随主题
+        detailRenderer->SetBackground(r, g, b);
+    }
     detailWidget->setRenderWindow(detailRenderWindow);
     detailRenderWindow->AddRenderer(detailRenderer);
     vtkRenderer* detailRendererPtr = detailRenderer.Get();
     vtkGenericOpenGLRenderWindow* detailRenderWindowPtr = detailRenderWindow.Get();
 
+    // VTK 背景随主题切换：ElaTheme 明/暗切换时，中央+详情渲染器重设底色并刷新。
+    QObject::connect(eTheme, &ElaTheme::themeModeChanged, detailWidget,
+                     [rendererPtr, renderWindowPtr, detailRendererPtr, detailRenderWindowPtr]() {
+                         double r, g, b;
+                         geopro::app::vtkBackground(r, g, b);
+                         rendererPtr->SetBackground(r, g, b);
+                         renderWindowPtr->Render();
+                         detailRendererPtr->SetBackground(r, g, b);
+                         detailRenderWindowPtr->Render();
+                     });
+
     // 数据详情容器：顶部「反演剖面/原数据」工具条 + 下方 QVTK 小视图。
     auto* detailContainer = new QWidget();
     auto* detailLayout = new QVBoxLayout(detailContainer);