style(header): bottom-align navbar row items

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ralyodio

apps/web/src/components/SiteHeader.tsx

@@ -33,7 +33,7 @@ export default function SiteHeader() {
       <WaitlistModal open={modalOpen} onClose={() => setModalOpen(false)} />
 
       <nav className="fixed top-0 left-0 right-0 z-40 border-b border-tc-border/50 bg-tc-darker/80 backdrop-blur-md">
-        <div className="mx-auto flex max-w-6xl items-center justify-between px-4 py-2.5 sm:px-6 sm:py-3">
+        <div className="mx-auto flex max-w-6xl items-end justify-between px-4 py-2.5 sm:px-6 sm:py-3">
           <a href="/" className="flex items-center gap-2">
             <img src="/logo.svg" alt="ThreatCrush" className="h-12 w-auto sm:h-14" />
           </a>