feat: edit some login indicator

scripts/managers/user_profile_manager.gd

@@ -9,6 +9,7 @@ signal avatar_changed(url: String)
 # Profile data
 var profile: Dictionary = {}
 var stats: Dictionary = {}
+var is_profile_loaded: bool = false
 
 # Nakama storage collection names
 const PROFILE_COLLECTION := "profiles"
@@ -36,6 +37,7 @@ func _on_auth_completed(success: bool, _user_data: Dictionary) -> void:
 func _on_logged_out() -> void:
 	profile = {}
 	stats = {}
+	is_profile_loaded = false
 
 # =============================================================================
 # Profile Loading
@@ -81,6 +83,7 @@ func load_profile() -> Dictionary:
 	# Load stats
 	await load_stats()
 	
+	is_profile_loaded = true
 	emit_signal("profile_loaded", profile)
 	print("[UserProfileManager] Profile loaded: ", profile.display_name)
 	return profile
@@ -257,8 +260,10 @@ func record_game_result(won: bool, score: int) -> void:
 # Getters
 # =============================================================================
 
-func get_display_name() -> String:
-	return profile.get("display_name", "Guest")
+func get_display_name(fallback: String = "Guest") -> String:
+	if not is_profile_loaded:
+		return fallback
+	return profile.get("display_name", fallback)
 
 func get_avatar_url() -> String:
 	var index: int = profile.get("avatar_index", 0)