homepage + NAB: rename 'Coverage Partners' → 'Content Partners' sitewide

SponsorLogoStrip section heading, the section aria-label, the home-page
section comment, and the NAB-2026 page heading + comment all swap to the
new label. No external API or schema references the old phrase, so this
is a pure copy change.

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

src/app/home-page/page.tsx

@@ -168,7 +168,7 @@ export default function HomePage() {
         <NewsletterSignup />
       </ScrollRevealSection>
 
-      {/* Coverage Partners logo strip — current banner advertisers */}
+      {/* Content Partners logo strip — current banner advertisers */}
       <ScrollRevealSection className="section-enter section-enter-5">
         <Suspense fallback={null}>
           <SponsorLogoStrip />

src/app/nab-2026/page.tsx

@@ -105,7 +105,7 @@ export default async function NabHub() {
           </h1>
           <p className="text-[#aaa] text-base max-w-3xl">
             {exhibitors.length.toLocaleString()} exhibitors confirmed.
-            {sponsorRows.length > 0 && <> {sponsorRows.length} are Broadcast Beat coverage partners.</>}
+            {sponsorRows.length > 0 && <> {sponsorRows.length} are Broadcast Beat content partners.</>}
             {" "}Browse the directory, read the latest product news, and find every booth.
           </p>
         </div>
@@ -113,12 +113,12 @@ export default async function NabHub() {
 
       <div className="max-w-6xl mx-auto px-4 py-10 space-y-12">
 
-        {/* Featured / Coverage Partners */}
+        {/* Featured / Content Partners */}
         {sponsorRows.length > 0 && (
           <section>
             <header className="flex items-baseline justify-between mb-4">
               <h2 className="text-xl font-display font-bold text-[#e0e0e0]">
-                Coverage Partners at the 2026 NAB Show
+                Content Partners at the 2026 NAB Show
               </h2>
               <span className="text-xs text-[#888]">{sponsorRows.length} exhibiting partner{sponsorRows.length === 1 ? "" : "s"}</span>
             </header>