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/ChannelAccountIdField.tsx

@@ -0,0 +1,34 @@
+type ChannelAccountIdFieldProps = {
+  label: string;
+  value: string;
+  onChange: (value: string) => void;
+  placeholder?: string;
+  helpText?: string;
+  disabled?: boolean;
+};
+
+export default function ChannelAccountIdField({
+  label,
+  value,
+  onChange,
+  placeholder,
+  helpText,
+  disabled,
+}: ChannelAccountIdFieldProps) {
+  return (
+    <div className="space-y-2">
+      <div className="text-[13px] font-medium text-[#525866] dark:text-gray-300">{label}</div>
+      <input
+        value={value}
+        onChange={(event) => onChange(event.target.value)}
+        placeholder={placeholder}
+        disabled={disabled}
+        autoComplete="off"
+        className="h-[44px] w-full rounded-[12px] border border-[#E5E8EE] bg-white px-3 text-[13px] text-[#171717] outline-none transition-colors placeholder:text-[#99A0AE] focus:border-[#2B7FFF] disabled:cursor-not-allowed disabled:opacity-60 dark:border-[#2a2a2d] dark:bg-[#101013] dark:text-gray-100"
+      />
+      {helpText ? (
+        <div className="text-[12px] leading-[18px] text-[#99A0AE] dark:text-gray-500">{helpText}</div>
+      ) : null}
+    </div>
+  );
+}