diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7d53f9b..2357669 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -70,14 +70,17 @@ FetchContent_MakeAvailable(qtkeychain)
 set(ELAWIDGETTOOLS_BUILD_STATIC_LIB ON CACHE BOOL "" FORCE)
 FetchContent_Declare(elawidgettools
   GIT_REPOSITORY https://github.com/RainbowCandyX/ElaWidgetTools.git
-  GIT_TAG main
+  GIT_TAG b80eadc4a199186e14656dce09959b3216a593be  # 钉定提交，构建可复现(review H1)
   SOURCE_SUBDIR ElaWidgetTools)
 FetchContent_MakeAvailable(elawidgettools)
 
 add_subdirectory(src)
 
-# ElaWidgetTools 评估 spike（隔离 demo，不属于产品 geopro_desktop；评估完删分支即弃）。
-add_subdirectory(spike/ela)
+# ElaWidgetTools 评估 spike（隔离 demo，默认不编；评估用 -DGEOPRO_BUILD_ELA_SPIKE=ON 开启，review M4）。
+option(GEOPRO_BUILD_ELA_SPIKE "Build ElaWidgetTools evaluation spike" OFF)
+if(GEOPRO_BUILD_ELA_SPIKE)
+  add_subdirectory(spike/ela)
+endif()
 
 enable_testing()
 add_subdirectory(tests)
diff --git a/src/app/main.cpp b/src/app/main.cpp
index 193ea73..e842a3b 100644
--- a/src/app/main.cpp
+++ b/src/app/main.cpp
@@ -1019,13 +1019,13 @@ int main(int argc, char* argv[])
     QWidget* topLevel = nullptr;
     if (qEnvironmentVariable("GEOPRO_UI_SHELL") == QLatin1String("ela")) {
         eApp->init();  // ElaApplication：Fluent 主题/字体/动画基建
-        auto* inner = new QMainWindow;
-        buildWorkbench(*inner, repo, projectRepo, nav);
         auto* ela = new ElaWindow;
         ela->setWindowTitle(kTitle);
         ela->resize(1280, 800);
         ela->setMinimumSize(1024, 680);
         ela->setIsNavigationBarEnable(false);   // 纯中心内容，不显示左侧导航栏
+        auto* inner = new QMainWindow(ela);      // 以 ela 为父，避免无父期调色板/DPI 抖动(review H3)
+        buildWorkbench(*inner, repo, projectRepo, nav);
         ela->setCentralCustomWidget(inner);      // 工作台作为 ElaWindow 中心内容
         topLevel = ela;
     } else {