Adds a 'narrow' prop that wraps the body in 'max-w-2xl mx-auto'
while keeping the header chrome at the standard 5xl. Settings is
the first consumer — its rows are dense text and look adrift at
full width. The header still aligns with the other tabs so the
title position stays consistent.
Covered by 2 SSR tests (narrow path adds the inner wrapper, default
path doesn't).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
yiekheng
7697ea5fcb