feat(render): sombra com a sprite 16x16 compartit

CMakeLists.txt

@@ -94,6 +94,7 @@ set(APP_SOURCES
     source/core/rendering/sprite/animated_sprite_parser.cpp
     source/core/rendering/effects/heat_haze.cpp
     source/core/rendering/effects/scan_reveal.cpp
+    source/core/rendering/effects/shadow.cpp
     source/core/rendering/transitions/mosaic.cpp
     source/core/rendering/transitions/fade_to_black.cpp
     source/core/rendering/sdl3gpu/sdl3gpu_shader.cpp