feat: add click to select

lightkeeper/include/Lightkeeper.h

@@ -36,6 +36,8 @@ public:
 private:
     void setupSkybox();
     void updateViewMode();
+    void focusSelection();
+    void updateFocus(float dt);
     [[nodiscard]] CameraComponent* getSceneCamera() const;
     [[nodiscard]] Camera& getViewCamera();
     [[nodiscard]] bool isPlayerViewActive() const;
@@ -57,6 +59,7 @@ private:
 
     Camera camera{glm::vec3(0.f, 0.f, -5.f), glm::vec3(0, 1, 0)};
     std::optional<Camera> editorCamera;
+    std::optional<glm::vec3> focusTarget;
 
     std::unique_ptr<CubeMap> skyboxCubemap;
     MainSceneObjects mainScene{};