feat: add imgui texture inspector (Thanks claude)

lightkeeper/include/Lightkeeper.h

@@ -22,6 +22,7 @@ public:
     void customFixedUpdate(float dt) override;
 
     void onWindowResize(int newWidth, int newHeight) override;
+    void customWindowsMenu() override;
 
 private:
     void drawDebugMenuBar();
@@ -49,6 +50,7 @@ private:
     bool renderBoxColliders{false};
     bool renderQuads{true};
     bool renderDebugLines{true};
+    bool showTestWindow{true};
 };
 
 #endif //LIGHTKEEPER_H