Ensure proper initialization of all Arrays and Dictionaries

resources/user/teacher_settings.gd

@@ -17,7 +17,7 @@ enum EducationMethod {
 @export var account_type: AccountType
 @export var education_method: EducationMethod
 var devices_count: int
-@export var students: Dictionary # int : Array[StudentData]
+@export var students: Dictionary[int, Array] = {} # int : Array[StudentData]
 @export var email: String
 var password: String
 @export var token: String
@@ -50,7 +50,7 @@ func update_from_dict(dict: Dictionary) -> void:
 		students[int(device)] = device_students
 
 func get_new_code() -> int :
-	var used_codes: Array[int]
+	var used_codes: Array[int] = []
 	for student_array: Array[StudentData] in students.values():
 		for student: StudentData in student_array:
 			used_codes.append(student.code)

resources/user/user_minigame_history.gd

@@ -13,7 +13,7 @@ var consecutives_losses: int = 0
 @export
 var consecutives_wins: int = 0
 @export
-var history: Array[bool]
+var history: Array[bool] = []
 
 func add_game(is_won: bool) -> void:
 	history.append(is_won)

resources/user/user_speeches.gd

@@ -4,7 +4,7 @@ class_name UserSpeeches
 signal speeches_changed
 
 # Contains the list of speeches already played
-@export var speeches_played: Array[String]
+@export var speeches_played: Array[String] = []
 
 func add_speech(speech: String) -> void:
 	if not speeches_played.has(speech):