Add/update autocomplete, inputmode, and required where appropriate

[charmander]

namely in the login box and password reset/2FA flows.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.86%. Comparing base (5c454ce) to head (e9d4847).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1503   +/-   ##
=======================================
  Coverage   62.86%   62.86%           
=======================================
  Files          95       95           
  Lines        9226     9226           
  Branches     1652     1652           
=======================================
  Hits         5800     5800           
  Misses       2936     2936           
  Partials      490      490           

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[huntertur]

Oh cool, I didn't know autocomplete="one-time-code" was a thing!