Say when no new code went out

[nursoda]

The challenge page sends a code only when none is stored, so a reload does not mail a
new one every time. What the page does not say is that this happened. It reads "Enter
the authentication code that was sent to a*@*.org:", which is true of a code from
several minutes ago just as much as of one sent a second ago — so someone whose mail is
slow, or who never received the earlier one, waits for a mail that is not coming.

One sentence appears now whenever no new code went out:

No new code was sent, because an earlier one is still valid. If it did not arrive, ask
for a new one.

The resend link right below it is what that last half refers to; while its cooldown runs,
the same line shows the countdown, so the way out is visible either way.

It is a sentence of its own rather than a longer version of the one above it. That one is
translated into twenty-odd languages, and rewording it would drop every one of those
translations back to English for a string that is not wrong — only incomplete.

Two things worth knowing

The sentence names the resend link by the words it carries, through a placeholder, so the
two cannot drift apart in a translation. During the cooldown that link is hidden and a
countdown stands in its place, so for up to a minute the sentence points at something not
yet on the page — the countdown right there says when it will be. Accepted rather than
worked around: hiding the explanation for that minute would leave the user with no reason
at all for the missing mail.

Once a resend succeeds the line is wrong — a new code just went out — so the click
handler removes it. A failed send leaves it standing, because then the earlier code is
still the only one. Both branches have a test.

Checked

• shown against a real Nextcloud 34: the line appears on the second load of the challenge
  page and not on the first
• stylelint and php-cs-fixer clean

Merge order

Based on #215, whose wording it extends, so that one goes first. The 3.3 counterpart is
a separate PR on #218; there the sentence matters more, because that line keeps the event
listener and cannot notice a changed notification address at all.

🤖 Generated with Claude Code, verified, tweaked and approved by @nursoda.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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