DEV-1174: add aria-expanded for navbar search toggle

[carylwyatt]

Fixes #73 and 1727026 expand/collapse on search bar isn't setting aria expanded correctly

Added aria-expanded attribute to the Search icon in the navbar to alert screen readers when the search bar is open or closed.

This fix is staged on dev-3 (vpn required): https://dev-3.www.hathitrust.org/

If you inspect the "search 🔍 " button in the navbar, it should now have an aria-expanded attribute set to true if the search bar is toggled to open (default on most pages). Toggle it closed, and the attribute should be set to false.

[netlify[bot]]

✅ Deploy Preview for hathitrust-firebird-common ready!

Name	Link
🔨 Latest commit	7307505ae35e4cdf904b2b1c3589f76f6f170c17
🔍 Latest deploy log	https://app.netlify.com/sites/hathitrust-firebird-common/deploys/66707f29d7806b0008da0764
😎 Deploy Preview	https://deploy-preview-85--hathitrust-firebird-common.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify site configuration.

[carylwyatt]

@angelinanz @giramesh This is now staged on test. You can test it in any app except page turner.

[giramesh]

I can confirm that I'm able to see the aria-expanded attribute get updated from true/false when the search is expanded/collapsed respectively.