Add unit tests for channel utilities and configure testing environment

- Created a new test file `channels.test.ts` to cover utilities related to channel configurations and targets.
- Implemented tests for normalizing and grouping selected channels by type, as well as building channel targets from account data and cron history.
- Mocked necessary dependencies to isolate tests and ensure accurate results.
- Updated `vite.config.ts` to set up the testing environment with jsdom and enable global variables for tests.

src/components/channels/ChannelConfigActions.tsx

@@ -0,0 +1,39 @@
+type ChannelConfigActionsProps = {
+  cancelLabel: string;
+  confirmLabel: string;
+  onClose: () => void;
+  onConfirm: () => void;
+  disabled?: boolean;
+  submitting?: boolean;
+};
+
+export default function ChannelConfigActions({
+  cancelLabel,
+  confirmLabel,
+  onClose,
+  onConfirm,
+  disabled,
+  submitting,
+}: ChannelConfigActionsProps) {
+  return (
+    <div className="flex items-center justify-end gap-3 pt-1">
+      <button
+        type="button"
+        className="h-[40px] rounded-full bg-[#EDECE4] px-5 text-[13px] font-semibold text-[#4B4B4B] transition-colors hover:bg-[#E5E4DC] disabled:cursor-not-allowed disabled:opacity-60 dark:bg-[#222225] dark:text-gray-200"
+        onClick={onClose}
+        disabled={disabled || submitting}
+      >
+        {cancelLabel}
+      </button>
+
+      <button
+        type="button"
+        className="h-[40px] rounded-full bg-[#2B7FFF] px-5 text-[13px] font-semibold text-white transition-opacity hover:opacity-90 disabled:cursor-not-allowed disabled:opacity-60"
+        onClick={onConfirm}
+        disabled={disabled || submitting}
+      >
+        {submitting ? `${confirmLabel}...` : confirmLabel}
+      </button>
+    </div>
+  );
+}