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/contributor/page.tsx

@@ -283,7 +283,7 @@ export default function ContributorDashboard() {
                 className={`w-full flex items-center gap-3 px-3 py-2.5 rounded-lg text-sm transition-colors text-left ${
                   view === item.id
                     ? 'bg-[#c9a84c]/10 text-[#c9a84c] border border-[#c9a84c]/20'
-                    : 'text-[#888] hover:text-white hover:bg-[#231d18]'
+                    : 'text-[#888] hover:text-white hover:bg-[#FFFFFF]'
                 }`}
               >
                 <span className="text-base w-5 text-center">{item.icon}</span>
@@ -339,7 +339,7 @@ export default function ContributorDashboard() {
                 <button onClick={() => setView('new-post')} className="px-5 py-2.5 bg-[#c9a84c] text-black font-semibold rounded-lg text-sm hover:bg-[#b8973b] transition-colors">
                   + New Post
                 </button>
-                <button onClick={() => setView('my-posts')} className="px-5 py-2.5 bg-[#231d18] border border-[#333] text-white rounded-lg text-sm hover:bg-[#222] transition-colors">
+                <button onClick={() => setView('my-posts')} className="px-5 py-2.5 bg-[#FFFFFF] border border-[#333] text-white rounded-lg text-sm hover:bg-[#222] transition-colors">
                   View My Posts
                 </button>
               </div>
@@ -453,7 +453,7 @@ export default function ContributorDashboard() {
                     {submittingPost ? 'Submitting...' : profile?.role === 'contributor' ? 'Submit for Review' : 'Publish Post'}
                   </button>
                   <button type="button" onClick={() => setView('overview')}
-                    className="px-5 py-2.5 bg-[#231d18] border border-[#333] text-[#888] rounded-lg text-sm hover:text-white hover:bg-[#222] transition-colors">
+                    className="px-5 py-2.5 bg-[#FFFFFF] border border-[#333] text-[#888] rounded-lg text-sm hover:text-white hover:bg-[#222] transition-colors">
                     Cancel
                   </button>
                 </div>