audio: refactor audio asset loading, add crit sound

src/common.h

@@ -2,6 +2,7 @@
 #define COMMON_H
 
 #include "settings.h"
+#include <raylib.h>
 
 // Tile types
 typedef enum { TILE_WALL, TILE_FLOOR, TILE_STAIRS } TileType;
@@ -112,6 +113,15 @@ typedef struct {
   StatusEffectType effect_type;  // used to pick color for proc labels
 } FloatingText;
 
+// AudioAssets
+typedef struct {
+  Sound attack1, attack2, attack3;
+  Sound pickup;
+  Sound staircase;
+  Sound dodge1, dodge2, dodge3;
+  Sound crit;
+} AudioAssets;
+
 // GameState - encapsulates all game state for testability and save/load
 typedef struct {
   Player player;
@@ -139,6 +149,8 @@ typedef struct {
   int screen_shake;  // frames of screen shake remaining
   int shake_x;
   int shake_y;
+  AudioAssets sounds;
 } GameState;
 
+
 #endif  // COMMON_H