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.

dist-electron/main/main.js

@@ -1,6 +1,6 @@
 "use strict";
 require("electron");
-require("./main-CK4u0iKH.js");
+require("./main-lgujyV0Y.js");
 require("electron-squirrel-startup");
 require("electron-log");
 require("bytenode");