update and improve ui

core/photo_mode/managers/collection_manager.gd

@@ -2,6 +2,7 @@ extends Node
 
 signal on_collectible_unlocked(collectible_id: StringName)
 signal on_photo_saved(filePath: String)
+signal on_photo_preview_ready(image: Image)
 
 @export var collectibles_library: CollectibleLibrary
 
@@ -35,14 +36,18 @@ func save_photo_to_disk_async(image: Image) -> void:
 	if not image:
 		return
 		
-	
 	if not DirAccess.dir_exists_absolute("user://photos"):
 		DirAccess.make_dir_absolute("user://photos")
 	
 	var timestamp = str(Time.get_unix_time_from_system())
 	var file_path = "user://photos/photo_" + timestamp + ".png"
-	image.save_png(file_path)
 	
+	WorkerThreadPool.add_task(func():
+		image.save_png(file_path)
+		call_deferred("_on_photo_saved_callback", file_path)
+	)
+
+func _on_photo_saved_callback(file_path: String) -> void:
 	saved_photos.append(file_path)
 	sync_save_data()
 	on_photo_saved.emit(file_path)

core/photo_mode/runtime/photo_mode_controller.gd

@@ -121,6 +121,7 @@ func take_photo_async() -> void:
 	var targets = get_tree().get_nodes_in_group("collectible")
 	var space_state = get_world_3d().direct_space_state
 	
+	CollectionManager.on_photo_preview_ready.emit(captured_image)
 	CollectionManager.save_photo_to_disk_async(captured_image)
 	
 	for target in targets:
@@ -138,6 +139,10 @@ func take_photo_async() -> void:
 				CollectionManager.unlock_collectible(target.collectible_data.id)
 	
 	GameState.save_game()
+	
+	var shutter_stay_duration = 0.15
+	await get_tree().create_timer(shutter_stay_duration).timeout
+	
 	GameState.on_photo_taken_finished.emit()
 
 func _on_photo_mode_black_screen_disappeared() -> void: