ADD: BVH Selection triangle

src/scene/vk_scene.cpp

@@ -149,7 +149,9 @@ void SceneManager::update_scene()
         return m;
     };
 
-    const float fov = glm::radians(70.f);
+    // Keep projection FOV in sync with the camera so that CPU ray picking
+    // matches what is rendered on-screen.
+    const float fov = glm::radians(mainCamera.fovDegrees);
     const float aspect = (float) _context->getSwapchain()->windowExtent().width /
                          (float) _context->getSwapchain()->windowExtent().height;
     const float nearPlane = 0.1f;