refactor: optimize snake sprite rendering using preloaded directional assets and implement HUD caching

source/game_input.cpp

@@ -26,6 +26,7 @@ bool handle_input_frame(InputContext &ctx) {
             setBackdropColor(RGB15(0, 0, 0));
             consoleSelect(ctx.topScreen);
             consoleClear();
+            invalidate_hud(*ctx.renderAssets);
         }
     }
 
@@ -115,11 +116,13 @@ bool handle_input_frame(InputContext &ctx) {
                 audio_play_pause(*ctx.audio);
                 audio_pause_music_if_enabled(*ctx.audio);
                 puts("\x1b[11;12HPaused");
+                invalidate_hud(*ctx.renderAssets);
             } else {
                 audio_resume_music_if_enabled(*ctx.audio);
                 audio_play_unpause(*ctx.audio);
                 consoleSelect(ctx.topScreen);
                 consoleClear();
+                invalidate_hud(*ctx.renderAssets);
             }
         } else {
             ctx.init_game();