Single component now owns the page chrome — wrapper width, padding,
vertical rhythm, and the page-header row (hidden-on-mobile H1 + an
optional right-aligned action slot). Dashboard, Accounts, Reminders,
Activity, and Settings all use it, replacing five copies of the same
\`<div className=\"max-w-5xl mx-auto px-4 ...\">\` markup.
Settings was previously \`max-w-2xl\` and \`container mx-auto\`; it
now matches the other tabs at 5xl so the chrome stays consistent.
Covered by 5 SSR tests (header order, responsive justify utilities,
wrapper class, action-optional path).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
yiekheng
a5cb8cea46