feat: add persistent inventory storage slots

tests/tackle_order_validation.gd

@@ -0,0 +1,50 @@
+extends SceneTree
+
+const Catalog: ItemCatalog = preload("res://items/catalog/item_catalog.tres")
+const PlayerMenuType = preload("res://ui/player_menu.gd")
+
+const EXPECTED_BAIT_ORDER: Array[StringName] = [
+	&"worms",
+	&"snails",
+	&"shrimp",
+	&"squid_chunks",
+	&"whole_sardine",
+	&"whole_anchovy",
+	&"luminous_roe",
+]
+
+
+func _initialize() -> void:
+	call_deferred("_run")
+
+
+func _run() -> void:
+	var player_menu := PlayerMenuType.new() as PlayerMenu
+	player_menu.set("_item_catalog", Catalog)
+	var tackle_items: Array[OwnedItem] = []
+	for item_id: StringName in [
+		&"luminous_roe",
+		&"whole_anchovy",
+		&"shrimp",
+		&"snails",
+		&"whole_sardine",
+		&"squid_chunks",
+		&"worms",
+	]:
+		var owned := OwnedItem.new()
+		owned.item_id = item_id
+		owned.quantity = 1
+		tackle_items.append(owned)
+	tackle_items.sort_custom(
+		func(first: OwnedItem, second: OwnedItem) -> bool:
+			return bool(player_menu.call(
+				"_sort_tackle_items", first, second
+			))
+	)
+	var sorted_ids: Array[StringName] = []
+	for owned: OwnedItem in tackle_items:
+		sorted_ids.append(owned.item_id)
+	assert(sorted_ids == EXPECTED_BAIT_ORDER)
+	player_menu.free()
+	print("Tackle order validation: PASS")
+	quit()