Feature/63 add imagegrid tests

[Brehana-Naidu]

No description provided.

[dhyana6466]

Nice work adding tests for the ImageGrid. The coverage is good – rendering, captions, missing captions, accessibility and even a placeholder case. I like that you used getByAltText and also added the axe check.

A couple of things to improve:

• The interaction test just checks if the image is still in the doc. Better to mock the click/onSelect and assert it gets called with the right data.
• The placeholder test might be fragile with next/image. Could mock it or check with a data-testid instead of relying on the exact src.
• In that placeholder test maybe keep the props consistent and spread defaultProps so styles are not skipped.
• Double-check the import path for ImageGrid. Some other tests in the repo use app/components/... instead of ../components/.... Just want to make sure CI doesn’t fail.
• If items are clickable, maybe also add a small keyboard test for accessibility.

Overall this is a solid start. With those fixes the test suite will be strong.