feat: implement dash and wall run movement states for the player controller

movement/states/state_dash.gd

@@ -8,6 +8,7 @@ var params: MovementParams:
 var elapsed: float = 0.0
 var direction: Vector3 = Vector3.ZERO
 var _exit_speed: float = 0.0
+var _last_vel: Vector3 = Vector3.ZERO
 
 # Cooldown tracked across dash instances
 static var _last_dash_time: float = -999.0
@@ -51,6 +52,7 @@ func enter(_data: Dictionary = {}) -> void:
 		
 	machine.player.velocity = direction * _exit_speed
 	machine.on_ground = false
+	_last_vel = machine.player.velocity
 
 
 func exit() -> void:
@@ -70,9 +72,17 @@ func update(delta: float) -> void:
 		return
 
 	# Maintain dash velocity
-	var vel = direction * _exit_speed
-	if machine.player.is_on_floor():
+	var player := machine.player
+	var vel: Vector3 = player.velocity
+	
+	if vel.distance_squared_to(_last_vel) > 100.0:
+		machine.switch_to("air")
+		return
+	
+	vel = direction * _exit_speed
+	if player.is_on_floor():
 		vel.y = -0.5 # Snap to floor to handle ramps
 		
-	machine.player.velocity = vel
-	machine.player.move_and_slide()
+	player.velocity = vel
+	player.move_and_slide()
+	_last_vel = player.velocity