* test(web): add unit tests for pure helper functions
Add vitest configuration and tests for:
- relativeTime: time formatting (just now, minutes, hours, days, months, years)
- lastPageFromLink: GitHub Link header pagination parsing
These are the first tests for the web frontend. The test framework
(vitest) was already in package.json but had no config or test files.
* test(web): exercise real GitHub helpers
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Co-authored-by: Hu Qiantao <huqiantao@HudeMacBook-Air.local>
Co-authored-by: Hunter B <hmbown@gmail.com>
HUQIANTAO