Enhance testing framework and UI integration for YAZE

- Added a comprehensive testing framework with support for unit, integration, and UI tests, improving overall test coverage and reliability.
- Integrated ImGui Test Engine for UI testing, allowing for real-time feedback and visualization of test results.
- Updated CMake configuration to conditionally include testing components based on build options, enhancing flexibility for developers.
- Introduced a new command in the CLI for running asset loading tests on ROMs, providing a straightforward way to validate functionality.
- Enhanced error handling and resource management during testing, ensuring stability and clarity in test execution.
- Improved user interface with a dedicated test dashboard for monitoring test progress and results, enhancing developer experience.

src/app/gfx/arena.h

@@ -19,12 +19,20 @@ class Arena {
 
   ~Arena();
 
+  // Resource management
   SDL_Texture* AllocateTexture(SDL_Renderer* renderer, int width, int height);
   void FreeTexture(SDL_Texture* texture);
   void UpdateTexture(SDL_Texture* texture, SDL_Surface* surface);
 
   SDL_Surface* AllocateSurface(int width, int height, int depth, int format);
   void FreeSurface(SDL_Surface* surface);
+  
+  // Explicit cleanup method for controlled shutdown
+  void Shutdown();
+  
+  // Resource tracking for debugging
+  size_t GetTextureCount() const { return textures_.size(); }
+  size_t GetSurfaceCount() const { return surfaces_.size(); }
 
   std::array<gfx::Bitmap, 223>& gfx_sheets() { return gfx_sheets_; }
   auto gfx_sheet(int i) { return gfx_sheets_[i]; }