The catalogue key for a plural is the `other` form -- `plural()` looks the
entry up by `forms.other` -- and keying it on the `one` form type-checks,
builds, passes every test, and falls back to English in all nine
languages. Nothing errors. It cost a round trip on #278 and would cost
the next one the same.
The part worth writing down is not the rule but the signal, because there
is only one: the "falling back to English" count from
i18n-catalog-check. The percentage is no use for this -- adding keys
moves the denominator, so it holds steady at 98% whether the new strings
are translated or not.
Also here: that a change touching user-visible strings is work in nine
catalogues and should be reported as such, including when the answer is
none; and that store tests do not exercise the component, with the
shift-click range bug from #278 as the standing example -- measured
inside a setState updater, which React runs after the anchor ref has
moved, so it passed every store assertion and failed the moment the built
app was driven.
No CLAUDE.md existed before this.
