add header, update copyright

Author: sawka

Taskfile.yml

@@ -1,4 +1,4 @@
-# Copyright 2024, Command Line Inc.
+# Copyright 2026, Command Line Inc.
 # SPDX-License-Identifier: Apache-2.0
 
 version: "3"

frontend/util/color-validator.ts

@@ -1,3 +1,6 @@
+// Copyright 2026, Command Line Inc.
+// SPDX-License-Identifier: Apache-2.0
+
 const HexColorRegex = /^#([\da-f]{3}|[\da-f]{4}|[\da-f]{6}|[\da-f]{8})$/i;
 const FunctionalColorRegex = /^([a-z-]+)\(/i;
 const NamedColorRegex = /^[a-z]+$/i;