jump ani fixing and transition animations

movement/states/state_ground.gd

@@ -52,11 +52,8 @@ func update(delta: float) -> void:
 	# ── Horizontal movement (exponential interpolation for smoothness) ───
 	var hvel := Vector3(vel.x, 0.0, vel.z)
 	var target_vel := wish_dir * effective_speed
-
-	if wish_dir.length_squared() > 0.0:
-		hvel = hvel.lerp(target_vel, 1.0 - exp(-params.ground_acceleration * delta))
-	else:
-		hvel = hvel.lerp(Vector3.ZERO, 1.0 - exp(-params.ground_deceleration * delta))
+	hvel = _next_horizontal_velocity(
+		hvel, target_vel, wish_dir.length_squared() > 0.0, delta)
 
 	vel.x = hvel.x
 	vel.z = hvel.z
@@ -127,6 +124,14 @@ func update(delta: float) -> void:
 		return
 
 
+func _next_horizontal_velocity(current: Vector3, target: Vector3,
+		has_input: bool, delta: float) -> Vector3:
+	var response := params.ground_acceleration \
+		if has_input else params.ground_deceleration
+	return current.lerp(target if has_input else Vector3.ZERO,
+		1.0 - exp(-response * delta))
+
+
 func _try_step_up(player: CharacterBody3D, wish_dir: Vector3, hvel: Vector3) -> void:
 	for i in range(player.get_slide_collision_count()):
 		var col = player.get_slide_collision(i)