Clean up hero section, fix Silas voice exclusion bug

- Remove cover art from hero (duplicated in clips below)
- Merge about section into hero for single flowing layout
- Center hero content, remove side-by-side layout
- Fix _match_voices_to_styles() bypassing BLACKLISTED_VOICES —
  Sebastian could get assigned to non-Silas callers

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

website/index.html

@@ -117,17 +117,8 @@
 
   <!-- Hero -->
   <section class="hero">
-    <div class="hero-inner">
-      <img
-        class="cover-art"
-        src="images/cover.png"
-        alt="Luke at the Roost cover art"
-        width="1440"
-        height="1440"
-        sizes="(min-width: 768px) 280px, 200px"
-        loading="eager"
-      >
-      <div class="hero-info">
+    <div class="hero-inner hero-inner--full">
+      <div class="hero-info hero-info--centered">
         <h1>Luke at the Roost</h1>
         <p class="tagline">The call-in talk show where Luke gives life advice to biologically questionable organisms.</p>
         <div class="phone" id="phone-section">
@@ -170,17 +161,13 @@
           <span class="secondary-sep">&middot;</span>
           <a href="https://ko-fi.com/lukemacneil" target="_blank" rel="noopener" class="secondary-link support-link">Support the Show</a>
         </div>
+        <p class="hero-about">Late-night call-in radio from a desert hermit's RV. Callers ring in with relationship disasters, workplace chaos, and life's dumbest decisions — and Luke tries to help. Sometimes it works. Sometimes it makes things worse.</p>
+        <p class="hero-about hero-about--bold">Part human callers, part AI-generated characters, fully unhinged advice. Each AI caller is generated in real-time with a unique personality, backstory, and voice — powered by large language models and custom text-to-speech. 37+ episodes and counting.</p>
+        <p class="hero-cta"><a href="/how-it-works">See how it works</a></p>
       </div>
     </div>
   </section>
 
-  <!-- About -->
-  <section class="about-section">
-    <p>Late-night call-in radio from a desert hermit's RV. Callers ring in with relationship disasters, workplace chaos, and life's dumbest decisions — and Luke tries to help. Sometimes it works. Sometimes it makes things worse.</p>
-    <p class="about-teaser">Part human callers, part AI-generated characters, fully unhinged advice. Each AI caller is generated in real-time with a unique personality, backstory, and voice — powered by large language models and custom text-to-speech. 37+ episodes and counting.</p>
-    <p><a href="/how-it-works">See how it works</a></p>
-  </section>
-
   <!-- Featured Clips -->
   <section class="home-clips-section">
     <div class="home-clips-header">