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.
Replace ghost/whisper/sparkle color palettes with guild/candlelight/parchment/ember/earth tokens.
Switch typography from NB Television Pro to Quietism serif. Update all 25 Vue components,
layouts, and pages to new design system. Add circle color tokens, typography scale, prose-guild
class, and warm texture effects. Clean up stale documentation files.
