ColumnsLayout mounts inside <ClientOnly> on /member/dashboard, so the
SSR fetch returned the empty default and the snapshot assignment to
upcomingEvents never re-ran after the client-side fetch resolved.
Skip the SSR phase explicitly (server: false) and expose data to the
template via a computed so post-fetch updates propagate to
EventsMiniSidebar.
Introduces three new layout primitives (no consumers yet). Adds
--page-pad-x/y/collapse CSS tokens to :root and .dark. Updates
PageHeader to read padding from tokens. Removes ignored size="large"
props from welcome and series pages. Fixes stray markdown in SidebarLayout.
