Fixed pistol and knife sprites for retail. Added firing mechanism.

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/features/player/weapon.dart

@@ -16,16 +16,13 @@ abstract class Weapon {
     required this.idleSprite,
     required this.fireFrames,
     required this.damage,
-    this.msPerFrame = 100, // Speed of animation
+    this.msPerFrame = 100,
   });
 
   int get currentSprite =>
       state == WeaponState.idle ? idleSprite : fireFrames[frameIndex];
 
-  bool get isFiring => state == WeaponState.firing;
-
-  /// The main entry point for the player to use the gun.
-  /// Returns true if a bullet was actually spent.
+  /// Core firing logic. Returns true if a bullet was spent.
   bool fire(int currentTime, {required int currentAmmo}) {
     if (state == WeaponState.idle && currentAmmo > 0) {
       state = WeaponState.firing;