Body-copy mailto links ("Chris @ FCI") and the chrome nav link
were rendering as plain text, hard to spot. Added an @layer base
rule that gives every `a[href]` a 1px underline at 2px offset and
the FCI Seed Grant green, with a subtle hover thicken. Tailwind
utilities still win on a per-element basis (the nav link keeps its
`text-ink-soft` color, the brand-image wrapper opts out via
`no-underline`).
Drops the stylized SVG mark in favor of public/fci-logo.png (the official
Food Co-op Initiative logo, including its wordmark). Because the logo now
contains the 'Food Co-op Initiative' text, the duplicate display-font
wordmark is removed; the 'Co-op Check-in' eyebrow stays as a quiet hairline
divider to the right (sm+ only, hidden on mobile to keep the header tight).
Joel Brock