feat: implement dash movement state with velocity calculation and cooldown logic

movement/states/state_dash.gd

@@ -61,15 +61,18 @@ func exit() -> void:
 func update(delta: float) -> void:
 	elapsed += delta
 	if elapsed > params.dash_duration:
-		# Transition to air with preserved velocity (slight decay)
 		machine.player.velocity = direction * _exit_speed * 0.85
-		machine.switch_to("air")
+		if machine.player.is_on_floor():
+			machine.on_ground = true
+			machine.switch_to("ground")
+		else:
+			machine.switch_to("air")
 		return
 
-	# Maintain dash velocity — no gravity, no friction
-	machine.player.velocity = direction * _exit_speed
-	machine.player.move_and_slide()
-
+	# Maintain dash velocity
+	var vel = direction * _exit_speed
 	if machine.player.is_on_floor():
-		machine.on_ground = true
-		machine.switch_to("ground")
+		vel.y = -0.5 # Snap to floor to handle ramps
+		
+	machine.player.velocity = vel
+	machine.player.move_and_slide()