chore: drop the hero byline, and refresh a figure in the UX audit notes

Two unrelated working-tree changes, committed as one at the owner's request.

Removes "Built for parents, by a parent." and its comment from the hero. It
was added two commits ago; taking it out is the owner's call, and the reasons
it was placed under the search rather than in the footer no longer apply.

The .heroByline rules in HomeView.module.css are deliberately left in place.
They are now unreferenced, but the class was purpose-built for this one line
and keeping it makes restoring the byline a one-line change. If the removal is
permanent, that block (and its 640px media query) should go with it.

Also updates two quoted figures in the 2026-07-02 UX audit notes from
"24,000+" to "27,000+".

Worth noting for the record: that file documents what the page said when it was
audited, and at that time it genuinely did say "24,000+" — which was itself the
bug later fixed by reading unique_schools instead of a field the API never
sent. Editing the quoted evidence makes the note read consistently with the
current site, at the cost of no longer being a verbatim record of what was
observed. Left as the owner edited it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

nextjs-app/components/HomeView.tsx

@@ -463,20 +463,6 @@ export function HomeView({ initialSchools, filters, totalSchools, howItWorks, ed
               geoState={geoState}
               geoError={geoError}
             />
-
-            {/*
-              Sits under the search rather than in the footer on purpose: this
-              is the one line on the page written in the first person, and it
-              earns its place at the moment someone is deciding whether to
-              trust a site full of government statistics. In the footer it
-              would be true and unread.
-
-              It is deliberately the only such claim — the page's other trust
-              signals are all about the data's provenance, which is checkable.
-              This one is about who made it, which is not, so it is stated
-              once, plainly, and never repeated.
-            */}
-            <p className={styles.heroByline}>Built for parents, by a parent.</p>
           </div>
 
           {/*