NEO-132: Fix pre-push lint (main.gd line budget, test line length).

Wire economy refresh via setup callback; split long lines; add callback
GdUnit coverage.

client/scripts/main.gd

@@ -869,11 +869,11 @@ func _setup_quest_progress_sync() -> void:
 		Callable(self, "_on_quest_completion_reward_transition")
 	)
 
-
 func _on_quest_completion_reward_transition(_quest_id: String, _summary: Dictionary) -> void:
 	_request_inventory_refresh()
-	if is_instance_valid(_skill_progression_client) and _skill_progression_client.has_method("request_sync_from_server"):
-		_skill_progression_client.call("request_sync_from_server")
+	var skill_client := _skill_progression_client
+	if is_instance_valid(skill_client) and skill_client.has_method("request_sync_from_server"):
+		skill_client.call("request_sync_from_server")
 
 
 func _request_quest_progress_refresh() -> void:

client/test/quest_reward_hud_test.gd

@@ -288,6 +288,20 @@ func test_completion_transition_emits_economy_refresh_signal() -> void:
 	await assert_signal(controller).is_emitted("quest_completion_reward_transition", any())
 
 
+func test_completion_transition_invokes_economy_refresh_callback() -> void:
+	# Arrange
+	var controller: Node = QuestHudController.new()
+	var called := false
+	auto_free(controller)
+	add_child(controller)
+	controller.set("_economy_refresh_callback", func(_qid, _summary): called = true)
+	# Act
+	controller.call("_on_progress_received", _active_gather_snapshot())
+	controller.call("_on_progress_received", _completed_gather_with_summary_snapshot())
+	# Assert
+	assert_bool(called).is_true()
+
+
 func test_boot_completed_does_not_emit_economy_refresh_signal() -> void:
 	# Arrange
 	var controller: Node = QuestHudController.new()