ci: GCC 11 portability + BUNDLE DESTINATION "." on macOS

Linux (Rocky manylinux, GCC 11):

- WgpuAreaMeasurement.h: include <cstddef> directly. GCC 11 does not
  transitively pull `size_t` through <vector>, so triangleCount()'s
  return type fails to parse.

- WgpuViewportWindow.cpp:meshLocalToGlobal: use static_cast<double>(...)
  instead of double(mesh_local[N]) when constructing the Eigen::Vector4d.
  The latter triggers GCC 11's most-vexing-parse: it reads
  `Vector4d local(double(mesh_local[0]), double(mesh_local[1]), ...)`
  as a function declaration of `local` taking parameters
  `double mesh_local[0]` etc., colliding with the outer `mesh_local`
  parameter and failing with "redefinition of double* mesh_local".

macOS arm64:

- IfcViewerWgpuMinimal + BonsaiViewer install rules: change
  `BUNDLE DESTINATION bin` → `BUNDLE DESTINATION .`. Qt's deploy
  generator emits `macdeployqt <Target>.app` with no path prefix, which
  only resolves when the bundle sits at the install-prefix root.
  `BUNDLE DESTINATION bin` put it at `<prefix>/bin/Target.app` and the
  install/strip step failed with "Could not find app bundle".

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/bonsaiviewer/CMakeLists.txt

@@ -133,11 +133,12 @@ target_link_libraries(BonsaiViewer PRIVATE
     Qt${QT_VERSION}::Widgets
 )
 
-# MACOSX_BUNDLE targets require BUNDLE DESTINATION at install time even when
-# nobody runs `make install` (CMake validates the rule at configure).
+# BUNDLE DESTINATION must be "." (install-prefix root) on macOS — Qt's
+# deploy generator emits `macdeployqt BonsaiViewer.app` (no path
+# prefix), which resolves only when the .app sits at the install root.
 install(TARGETS BonsaiViewer
     EXPORT  ${IFCOPENSHELL_EXPORT_TARGETS}
     RUNTIME DESTINATION bin
-    BUNDLE  DESTINATION bin
+    BUNDLE  DESTINATION .
 )
 ifcopenshell_deploy_qt_runtime(BonsaiViewer)

src/ifcviewer-wgpu-minimal/CMakeLists.txt

@@ -45,12 +45,14 @@ if(UNIX AND NOT APPLE AND WGPU_NATIVE_LIB_DIR)
     )
 endif()
 
-# MACOSX_BUNDLE targets require BUNDLE DESTINATION at install time even
-# when nobody is going to run `make install` (CMake validates the rule
-# at configure). Provide one alongside the regular bin/ runtime path.
+# BUNDLE DESTINATION must be "." (install-prefix root) on macOS — Qt's
+# deploy generator emits `macdeployqt IfcViewerWgpuMinimal.app` (no
+# path prefix), which resolves only when the .app sits at the install
+# root. With `bin/` it can't find the bundle and the install/strip
+# step fails.
 install(TARGETS IfcViewerWgpuMinimal
     EXPORT  ${IFCOPENSHELL_EXPORT_TARGETS}
     RUNTIME DESTINATION bin
-    BUNDLE  DESTINATION bin
+    BUNDLE  DESTINATION .
 )
 ifcopenshell_deploy_qt_runtime(IfcViewerWgpuMinimal)

src/ifcviewer-wgpu/WgpuAreaMeasurement.h

@@ -20,6 +20,7 @@
 #ifndef WGPUAREAMEASUREMENT_H
 #define WGPUAREAMEASUREMENT_H
 
+#include <cstddef>
 #include <cstdint>
 #include <unordered_map>
 #include <vector>

src/ifcviewer-wgpu/WgpuViewportWindow.cpp

@@ -3136,9 +3136,13 @@ bool WgpuViewportWindow::meshLocalToGlobal(uint32_t object_id,
         using Mat4dCol = Eigen::Matrix<double, 4, 4, Eigen::ColMajor>;
         const Eigen::Matrix4d P =
             Eigen::Map<const Mat4dCol>(inst.placement_transformation);
-        const Eigen::Vector4d local(double(mesh_local[0]),
-                                    double(mesh_local[1]),
-                                    double(mesh_local[2]),
+        // static_cast (not `double(...)`) to dodge GCC 11's most-vexing-parse:
+        // `Vector4d local(double(mesh_local[0]),…)` is otherwise read as a
+        // function declaration of `local` whose parameter is `double mesh_local[0]`,
+        // shadowing the outer `mesh_local` parameter.
+        const Eigen::Vector4d local(static_cast<double>(mesh_local[0]),
+                                    static_cast<double>(mesh_local[1]),
+                                    static_cast<double>(mesh_local[2]),
                                     1.0);
         const Eigen::Vector3d global =
             (m.coordinate_operation_meters * P * local).head<3>();