feat(brand+promotion): brand-gradient system, restyled /about/* + team + contact, alias-based client matcher

Three coupled rollouts in one shot.

PART A — client highlight matcher (DB migration applied separately):
- promoted-articles.ts: AdvertiserName now carries brand_aliases; matcher
  iterates legal name + every alias with word-boundary regex and picks the
  longest match across all candidates so "Magewell Launches…" resolves to
  "Magewell Electronics Co., Ltd." via its Magewell alias.
- New isStoryAboutClient gate: hard-accept at position 0, accept if any
  editorial frame ("Product Spotlight:", "Review:", "First Look", …) appears
  in the prefix, hard-reject if the prefix ends with a partner/usage phrase
  ("with", "using", "powered by", "dealer of", "integration with", "used",
  "deploys", "runs on", "leverages", …), otherwise accept within a 32-char
  subject window. Validated against 5,000 historical posts: 27 partner
  false-positives blocked, 3 editorial-frame stories correctly saved, the
  Magewell article now highlights.

PART B — restyling /about, /about/team, /about/contact:
- New .brand-gradient utility: #2563EB→#1E3A8A linear-gradient with a
  16%-opacity diagonal sheen that sweeps in the first 30% of a 7s cycle
  and rests offscreen-right for the rest. Respects prefers-reduced-motion
  (band parked statically at 6% opacity).
- Team page: dark legacy hero (red radial, #ff5a55 eyebrows) replaced with
  brand-gradient hero; outer text wrapper #e5e7eb → #0F172A so section
  headings stop being white-on-white; all serif H1/H2/H3 → font-display;
  red accents (#ff5a55 / #ff6b66 / rgba(214,7,1)) → blue (#93C5FD / #7DD3FC
  / rgba(29,78,216)).
- About page: H1 + Stat values → font-display; Stat cards get a brand-
  gradient top stripe.
- Contact page: outer wrapper #e5e7eb → #0F172A (fixes the white-on-white
  Contact H1); H1 gets explicit text-[#0F172A] + font-display; dark contact
  cards keep dark bg but gain a brand-gradient top stripe + explicit
  text-[#e5e7eb] body + brighter cyan eyebrow/link colors.

PART C — richer Industry News client highlight:
- ArticleFeed: client-promoted row swaps the static border-l-4 for an
  absolute-positioned .brand-gradient strip on the left edge (sheen pulses
  through). Row gets a slightly richer bg tint (from-#1D4ED8/12 via /4).
- HIGHLIGHT pill now uses .brand-gradient instead of the static blue chip.

Also shipping the earlier-staged work:
- AnimatedLogo onDark: white ring around tile + brighter (#E2E8F0) tagline
  + cyan accent rule for the blue header.
- Article-prose: em/strong/code dark colors (em fixes the trailing
  copyright/trademark ghost text), hr line color, figcaption readable.
- ArticleComments: "Sign in to join the discussion" bar uses brand-gradient
  + white/outline buttons that read on blue.
- Forum: Discover/Following, Newest/Top Voted/Unanswered, Sign in to post,
  Start a thread, Create account — slim pills, brand-gradient active.

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

src/app/about/page.tsx

@@ -18,7 +18,7 @@ export default function AboutPage() {
               <div className="text-[10px] font-mono uppercase tracking-[0.22em] text-[var(--color-text-info,#60a5fa)] mb-2">
                 AV Beat
               </div>
-              <h1 className="font-serif text-4xl md:text-5xl font-bold tracking-tight">About</h1>
+              <h1 className="font-display text-4xl md:text-5xl font-bold tracking-tight">About</h1>
               <p className="mt-3 text-[#475569] text-base max-w-2xl">
                 An independent trade publication covering pro AV, live production, display tech, and signal-flow technology.
               </p>
@@ -78,9 +78,13 @@ export default function AboutPage() {
 }
 
 function Stat({ label, value }: { label: string; value: string }) {
+  // Brand-gradient top accent (animated sheen) gives the stat tile its
+  // on-brand identity without redoing the layout. The tile itself stays
+  // white-on-light-border for legibility.
   return (
-    <div className="rounded border border-[#DCE6F2] bg-[#FFFFFF] p-4">
-      <div className="font-serif text-3xl text-[#0F172A]">{value}</div>
+    <div className="relative overflow-hidden rounded border border-[#DCE6F2] bg-[#FFFFFF] p-4">
+      <span className="brand-gradient absolute top-0 left-0 right-0 h-1" aria-hidden />
+      <div className="font-display text-3xl font-bold text-[#0F172A]">{value}</div>
       <div className="mt-1 text-[10px] font-mono uppercase tracking-[0.16em] text-[#475569]">
         {label}
       </div>