Brandon/293 share schedule UI changes

[iphonecats]

Summary

Resolves #293

Edit style of expand button for comparison panel and Trigger special LoginModal when user clicks 'share schedule' button or toggle compare button without logging in

Checklist

• [x] Edit styling of the expand button for the comparison panel (refer to figma). Code for the button
• [x] Trigger LoginModal (in components folder) when user clicks 'share schedule' button or toggle compare button without logging in. Look at HeaderActionBar for details on how to use the LoginModal component. Match the styling of the LoginModal to the styling of the figma and change text as well (previous LoginModal usage shouldn't change so maybe create props to determine text/styling).

How to Test

attempt sharing while not logged in

[github-actions[bot]]

PR Preview Action v1.4.7 :---: :rocket: Deployed preview to https://gt-scheduler.github.io/website/pr-preview/pr-296/ on branch gh-pages at 2024-03-04 05:11 UTC

[jwu543]

Everything looks great according to designs!