Add speaker-labeled transcripts, favicon, host stream fix, episode page

- Re-label all 8 episode transcripts with LUKE:/CALLER: speaker labels
  using LLM-based diarization (relabel_transcripts.py)
- Add episode.html transcript page with styled speaker labels
- Update publish_episode.py to generate speaker-labeled transcripts
  and copy to website/transcripts/ for Cloudflare Pages
- Add SVG favicon with PNG fallbacks
- Fix CPU issue: tie host audio stream to on-air toggle, not per-caller
- Update how-it-works page with post-production pipeline info
- Add transcript links to episode cards in app.js

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

website/js/app.js

@@ -119,6 +119,7 @@ function renderEpisodes(episodes) {
     const durStr = parseDuration(ep.duration);
 
     const metaParts = [epLabel, dateStr, durStr].filter(Boolean).join(' · ');
+    const epSlug = ep.link ? ep.link.split('/episodes/').pop()?.replace(/\/$/, '') : '';
 
     card.innerHTML = `
       <button class="episode-play-btn" aria-label="Play ${ep.title}" data-url="${ep.audioUrl}" data-title="${ep.title.replace(/"/g, '&quot;')}">
@@ -128,6 +129,7 @@ function renderEpisodes(episodes) {
         <div class="episode-meta">${metaParts}</div>
         <div class="episode-title">${ep.title}</div>
         <div class="episode-desc">${truncate(ep.description, 150)}</div>
+        ${epSlug ? `<a href="/episode.html?slug=${epSlug}" class="episode-transcript-link">Read Transcript</a>` : ''}
       </div>
     `;