Design for splitting SchoolDetailView (65KB) and SecondarySchoolDetailView
(46KB) into server section components behind a small client shell, following
the existing components/compare/ decomposition pattern.
Key constraint: a server component imported by a client component becomes
client, so sections are composed in page.tsx and passed through the shell as
children. Moving /api/national-averages server-side is a prerequisite, since
the England-comparison deltas feed most sections.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
