refactor main game loop

CMakeLists.txt

@@ -31,6 +31,7 @@ find_package(nlohmann_json CONFIG REQUIRED)
 
 set(TETRIS_SOURCES
     src/main.cpp
+    src/app/TetrisApp.cpp
     src/gameplay/core/Game.cpp
     src/core/GravityManager.cpp
     src/core/state/StateManager.cpp
@@ -67,6 +68,7 @@ set(TETRIS_SOURCES
     src/states/PlayingState.cpp
 )
 
+
 if(APPLE)
     set(APP_ICON "${CMAKE_SOURCE_DIR}/assets/favicon/AppIcon.icns")
     if(EXISTS "${APP_ICON}")