Dynamic theming
Changes apply instantly via CSS variables at :root:--font-primary, --font-secondary, --color-primary.
Fonts
Select the website font (and an optional secondary font for headings).
Primary color
This powers buttons, accents, and focus rings.
Preview
Buttons & accents update live
Supabase integration (placeholder)
Later, store theme settings per-admin/per-store in Supabase and hydrate them on first load to avoid any flash.