Lime trip import time warning; Improve signup agreement styling

[rgalanakis]

Improve signup agreement styling

• Make the entire agreement text clickable and with a highlighted
  box sort of look.
• Use blue around the checkbox.
• Submit is enabled and errors if the box is not checked.

---

Lime trip import: handle invalid time better

We are seeing yet another new report format from Lime;
I think it's invalid. But in the meantime, just report on rows
with invalid times, rather than failing the import entirely,
so it doesn't become blocking.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.79%. Comparing base (b18ed57) to head (b80d7c7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #932   +/-   ##
=======================================
  Coverage   99.79%   99.79%           
=======================================
  Files         754      754           
  Lines       37519    37532   +13     
=======================================
+ Hits        37441    37454   +13     
  Misses         78       78           

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