feat: Enhance Dungeon Rendering with Size Adjustments and Testing Initialization

- Added InitializeForTesting method in Rom class to facilitate testing setup.
- Updated DungeonCanvasViewer to adjust object and sprite sizes from 16x16 to 8x8, improving rendering accuracy.
- Modified rendering logic for various dungeon objects (chests, doors, walls, pots) to reflect new size calculations.
- Adjusted object position calculations in ObjectRenderer to align with the new size metrics, ensuring consistent rendering across the application.
- Updated integration tests to verify the new initialization method for ROM objects.

test/integration/dungeon_editor_test.h

@@ -28,6 +28,7 @@ class DungeonEditorIntegrationTest : public ::testing::Test {
       status = rom_->LoadFromFile("zelda3.sfc");
     }
     ASSERT_TRUE(status.ok()) << "Could not load zelda3.sfc from any location";
+    ASSERT_TRUE(rom_->InitializeForTesting().ok());
     
     // Pass ROM to constructor so all components are initialized with it
     dungeon_editor_ = std::make_unique<editor::DungeonEditor>(rom_.get());