Add aria-expanded to Transit Leg Summary

[nikkisato]

Using https://www.opentripplanner.org/otp-ui/?path=/story/itinerarybody-otp-ui--walk-transit-walk-itinerary-with-agency-information&globals=locale:en-US

if we use a screenreader right now the Ride 3 min / 2 stops doesn't announce expanded for screenreader users.

by adding an aria-expanded to the TransitLegSummary I'm now able to hear expanded and collapsed for this line

[nikkisato]

@miles-grant-ibigroup This is ready for review!

[miles-grant-ibigroup]

Have you run pnpm update-snapshots?

[nikkisato]

@miles-grant-ibigroup Ran pnpm update-snapshots

All set now

[miles-grant-ibigroup]

Changes look great

[amy-corson-ibigroup]

Hello! Thank you for the PR and I want to apologize in advance, I think this fix is actually a little more complicated!

Technically we currently announce this button to screenreaders as Ride 3 min / 2 stops (Expand details). I agree with you that aria-expanded is a more appropriate way to handle this (I really hope I'm not forgetting something about why we did it this way!) However if we make this change, it will require the following:

1. This change should be applied to AccessLegBody, TransitLegSummmary, and TransitLegBody so the accessibility approach is consistent throughout the itinerary.
2. The InvisibleAdditionalDetails component with "(Expand details)" in each of these components should be removed and the otpUi.TransitLegBody.expandDetails string should also be removed from the internationalization files.
3. Per the aria-expanded docs, the button in each case will also need an aria-controls property with the id of the collapsed/expanded container.

Let me know if I can clarify any of these points! Thank you again.