The fork's server-authoritative WS redesign rebroadcasts PAGE_UPDATED
(updateOne) title changes to the whole space room including the author.
The author's own client applied that echo to the ["pages", slugId] cache,
which feeds the title prop; the setContent effect then overwrote the
in-progress title with the lagging echo, dropping just-typed characters
and jumping the cursor.
Guard the setContent effect so it skips while the title editor is focused
(and when destroyed): external/echo title updates are applied only when
the field is not being actively edited. Page navigation is unaffected
because TitleEditor remounts per page (key={page.id}) and seeds content
at creation.
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