Forgot password says what happened and who sends it; People shows who hasn't signed in here - #311

Summary

This is the dashboard half of CoderHelm/coderhelm-platform#464.

• The sign-in page's Forgot password now shows what happened for the email. It names who sends the email, so a person can ask IT to allow that address.
• Settings, Members and roles no longer makes someone copied from the previous CoderHelm look active on this install. Admins can send set-up emails from the row, or to everyone at once.

Changes

• Forgot password (self-hosted):
  • The page shows the server's message for each case:
    • a reset code was sent: the page moves to the code entry
    • "You don't have an account here yet. We sent you a set-up link instead."
    • an invite to use
    • "There's no account for on this CoderHelm. Ask an admin to add you.", shown as an error
  • A sender line comes from GET /auth/methods senders, for example: "The reset code comes from no-reply@verificationemail.com (Amazon Cognito, which signs people in here)." or "The set-up link comes from ." It asks the person to check spam, quarantine, or ask IT. When the server sends no senders, the line is hidden.
  • Hosted keeps its single message.
• Members and roles:
  • A person with no account here now shows Hasn't signed in here yet as their main status, in place of "Active N days ago".
  • Their old activity time, if any, reads "Last active on the previous Coderhelm, 5 days ago".
  • When they have a linked GitHub account and /auth/methods says GitHub works, the row says "Can sign in with GitHub (login)".
  • Send set-up email is a button on the row, and it stays in the menu.
  • The page lead adds "N haven't signed in here yet".
  • A banner reads "N people haven't set up an account here yet", with Send set-up emails to all. Only admins see the button; others are told to ask an admin. A toast reports how many were sent and how many were skipped because they got one in the last hour.
• teamApi.setupEmailsAll, SignInMethods.senders, ForgotStatus.

Verification

• npm run lint, npm run typecheck, and npm run build (static export) pass.
• E2E_STATIC=1 npx playwright test e2e/team.spec.ts e2e/sign-in-methods.spec.ts --project=chromium: 36 passed. The new tests cover:
  • a reset code shows Cognito's sender
  • a set-up link shows the install's sender and no code box
  • no account shows the message and no sender line
  • with an SES sender, that address is shown and not Cognito's
  • a copied-over row shows "Hasn't signed in here yet" with no "Active", plus the previous-activity label, the GitHub line and the row button
  • no GitHub line when GitHub sign-in is off
  • the banner count and send to all, skipping the last hour
  • no send button for a member
• The screenshot checks find no sideways scroll at 1280 or 375 px.