Fix ESC quitting, memory layout overlap, shuffle and move counting

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

main.odin

@@ -13,6 +13,7 @@ mouse_y: i32
 main :: proc() {
     raylib.InitWindow(themes.SCREEN_WIDTH, themes.SCREEN_HEIGHT, cstring("HanjaKanaMun"))
     defer raylib.CloseWindow()
+    raylib.SetExitKey(raylib.KeyboardKey.KEY_NULL)
     
     assets.load_fonts()
     defer assets.unload_fonts()