feat: add finite lifetimes and despawn mechanics for rotten and cursed apples

include/game_state.h

@@ -32,6 +32,13 @@ struct Barrier {
     uint16_t framesLeft = 0; // Frames remaining in the current phase
 };
 
+// Evil item (rotten apple or cursed apple) with position and lifetime in game ticks
+struct EvilItem {
+    int8_t x = 0;
+    int8_t y = 0;
+    uint16_t ticksRemaining = 0;
+};
+
 struct GameState {
     volatile uint16_t ticks = 0;
     volatile uint16_t snakelength = 0;
@@ -55,8 +62,8 @@ struct GameState {
 
     std::deque<std::array<int, 3>> snake;
     std::vector<std::array<int, 2>> apples;
-    std::vector<std::array<int, 2>> bad_apples;
-    std::vector<std::array<int, 2>> cursed_apples;
+    std::vector<EvilItem> bad_apples;
+    std::vector<EvilItem> cursed_apples;
 };
 
 #endif