feat(brand): AV BEAT 2026 rebrand — blue/navy/white identity

- New AvBeatLogo inline-SVG component (rounded-square emblem with
  forward-leaning AV monogram + horizontal beam detail) at
  src/components/AvBeatLogo.tsx, three variants (full/wordmark/icon).
- Header.tsx now uses the responsive AV BEAT logo lockup in the
  top-left, links to /, full lockup on desktop (emblem+wordmark+tagline),
  emblem+wordmark on tablet, emblem-only on mobile.
- Removed DualSpeedTicker (the 'RECENT FORUM POSTS' ticker strip);
  the news ticker / glow chrome does not match the new aesthetic and the
  forum row was the explicit removal target.
- Tailwind theme + globals.css now expose the AV BEAT 2026 palette as
  semantic tokens: --brand-blue (#1D4ED8), --brand-blue-bright (#38BDF8),
  --brand-navy (#0F172A), --brand-bg (#F8FAFC), --brand-surface, --brand-border,
  --brand-text, --brand-text-muted. Legacy --color-* aliases re-point to the
  new tokens so any inline-styled component re-themes for free.
- Site-wide hex sweep migrates 2,769 hardcoded color literals across 144
  files from the old dark-broadcast palette to the new tokens (orange
  -> blue, dark-brown -> white surface / navy text, cream -> navy).
- Layout body class flipped from 'bb-neon' to 'bg-brand-bg text-brand-text'
  so the dark glow chrome no longer leaks through the new light theme.

src/app/admin/banners/[id]/analytics/page.tsx

@@ -142,7 +142,7 @@ export default async function BannerAnalyticsPage({
 
   return (
     <main className="mx-auto max-w-6xl px-6 py-10 text-[#e5e7eb]">
-      <Link href="/admin/banners" className="text-sm text-[#F0A623] hover:underline">
+      <Link href="/admin/banners" className="text-sm text-[#1D4ED8] hover:underline">
         ← Back to banners
       </Link>
 
@@ -159,7 +159,7 @@ export default async function BannerAnalyticsPage({
             <p className="text-sm text-[#9ca3af]">
               {b.size} · {b.status} ·{" "}
               {b.click_url && (
-                <a className="text-[#F0A623] hover:underline" href={b.click_url} target="_blank" rel="noopener noreferrer">
+                <a className="text-[#1D4ED8] hover:underline" href={b.click_url} target="_blank" rel="noopener noreferrer">
                   {b.click_url.slice(0, 80)}{b.click_url.length > 80 ? "…" : ""}
                 </a>
               )}