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.
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