feat: chapter list drawer in sticky header + remove duplicate title heading

- Remove the duplicate <h1> that appeared in the content area below the
  sticky bar (title is already shown in the header)
- Replace the static title span with a clickable button (title + ▼ caret)
  that opens a full-width chapter list drawer below the sticky bar
- Drawer is server-rendered with all chapters; current chapter is highlighted
  in amber and scrolled into view on open; clicking any row navigates to it
  and closes the drawer
- Opening the chapter list closes the settings panel and vice versa
- Both panels dismiss on outside click
- Pass AllChapters to the chapter template data struct

scraper/internal/server/ui.go

@@ -1075,8 +1075,14 @@ const chapterTmpl = `
     <span style="flex-shrink:0;padding:0.375rem 0.625rem;border-radius:0.5rem;color:#52525b;font-size:0.8125rem;cursor:default;">&#8592; Prev</span>
     {{end}}
 
-    <!-- Chapter title (centre, truncated) -->
-    <span style="flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-align:center;font-size:0.8125rem;color:#a1a1aa;" title="{{.Title}}">{{.Title}}</span>
+    <!-- Chapter title button — opens chapter list drawer -->
+    <button id="chapter-list-btn"
+            onclick="toggleChapterList()"
+            title="Jump to chapter"
+            style="flex:1;min-width:0;display:flex;align-items:center;justify-content:center;gap:0.375rem;overflow:hidden;background:transparent;border:none;cursor:pointer;padding:0.375rem 0.25rem;">
+      <span style="overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:0.8125rem;color:#a1a1aa;">{{.Title}}</span>
+      <span style="flex-shrink:0;font-size:0.625rem;color:#52525b;">&#9660;</span>
+    </button>
 
     <!-- Next chapter -->
     {{if .NextN}}
@@ -1119,6 +1125,28 @@ const chapterTmpl = `
     <span id="tts-status"></span>
   </div>
 
+  <!-- Chapter list drawer -->
+  <div id="chapter-list-panel"
+       style="display:none;position:absolute;left:0;right:0;top:100%;max-height:60vh;overflow-y:auto;background:#18181b;border-bottom:1px solid #27272a;box-shadow:0 8px 24px rgba(0,0,0,0.6);z-index:99;">
+    <div style="max-width:42rem;margin:0 auto;padding:0.5rem 0;">
+      {{range .AllChapters}}
+      <a href="/books/{{$.Slug}}/chapters/{{.Number}}"
+         hx-get="/books/{{$.Slug}}/chapters/{{.Number}}"
+         hx-target="#main-content"
+         hx-push-url="true"
+         hx-swap="innerHTML"
+         onclick="closeChapterList()"
+         {{if eq .Number $.ChapterN}}data-current="1"{{end}}
+         style="display:flex;align-items:baseline;gap:0.75rem;padding:0.5rem 1rem;text-decoration:none;transition:background 0.1s;{{if eq .Number $.ChapterN}}background:#27272a;{{end}}"
+         onmouseover="this.style.background='#27272a'" onmouseout="this.style.background='{{if eq .Number $.ChapterN}}#27272a{{else}}transparent{{end}}'">
+        <span style="flex-shrink:0;font-size:0.75rem;color:#52525b;width:2.5rem;text-align:right;">{{.Number}}</span>
+        <span style="font-size:0.875rem;{{if eq .Number $.ChapterN}}color:#fbbf24;font-weight:500;{{else}}color:#d4d4d8;{{end}}">{{if .Title}}{{.Title}}{{else}}Chapter {{.Number}}{{end}}</span>
+        {{if eq .Number $.ChapterN}}<span style="flex-shrink:0;font-size:0.7rem;color:#f59e0b;margin-left:auto;">&#9654; now</span>{{end}}
+      </a>
+      {{end}}
+    </div>
+  </div>
+
   <!-- Settings dropdown panel -->
   <div id="settings-panel"
        style="display:none;position:absolute;right:max(0.5rem,calc(50% - 32rem + 0.5rem));top:calc(100% + 0.25rem);min-width:260px;background:#18181b;border:1px solid #27272a;border-radius:0.75rem;padding:1rem;box-shadow:0 8px 24px rgba(0,0,0,0.5);z-index:100;">
@@ -1152,10 +1180,6 @@ const chapterTmpl = `
 <!-- ─── Chapter content ────────────────────────────────────────────────────── -->
 <div class="max-w-2xl mx-auto px-4 py-10">
 
-  <header>
-    <h1 class="text-2xl font-bold text-zinc-100 mb-6">{{.Title}}</h1>
-  </header>
-
   <!-- Paragraphs get data-para-idx injected by JS after render -->
   <article id="chapter-article" class="prose text-zinc-300 leading-relaxed text-[1.05rem]">
     {{.HTML}}
@@ -1237,20 +1261,50 @@ const chapterTmpl = `
   var article   = document.getElementById('chapter-article');
 
   // ── settings panel toggle ─────────────────────────────────────────────────────
-  var settingsPanel = document.getElementById('settings-panel');
+  var settingsPanel    = document.getElementById('settings-panel');
+  var chapterListPanel = document.getElementById('chapter-list-panel');
+  var chapterListBtn   = document.getElementById('chapter-list-btn');
+
+  window.closeChapterList = function () {
+    chapterListPanel.style.display = 'none';
+    chapterListBtn.querySelector('span:last-child').innerHTML = '&#9660;';
+  };
+
+  window.toggleChapterList = function () {
+    var open = chapterListPanel.style.display !== 'none';
+    // Close settings if open
+    settingsPanel.style.display = 'none';
+    if (open) {
+      closeChapterList();
+    } else {
+      chapterListPanel.style.display = 'block';
+      chapterListBtn.querySelector('span:last-child').innerHTML = '&#9650;';
+      // Scroll the current chapter row into view inside the panel
+      var current = chapterListPanel.querySelector('[data-current="1"]');
+      if (current) current.scrollIntoView({ block: 'center' });
+    }
+  };
 
   window.toggleSettings = function () {
     var open = settingsPanel.style.display !== 'none';
+    // Close chapter list if open
+    closeChapterList();
     settingsPanel.style.display = open ? 'none' : 'block';
   };
 
-  // Close settings panel when clicking outside
+  // Close both panels when clicking outside
   document.addEventListener('click', function (e) {
-    if (settingsPanel.style.display === 'none') return;
-    var btn = document.getElementById('settings-btn');
-    if (!settingsPanel.contains(e.target) && e.target !== btn && !btn.contains(e.target)) {
+    var settingsBtn = document.getElementById('settings-btn');
+    if (settingsPanel.style.display !== 'none' &&
+        !settingsPanel.contains(e.target) &&
+        e.target !== settingsBtn && !settingsBtn.contains(e.target)) {
       settingsPanel.style.display = 'none';
     }
+    if (chapterListPanel.style.display !== 'none' &&
+        !chapterListPanel.contains(e.target) &&
+        e.target !== chapterListBtn && !chapterListBtn.contains(e.target)) {
+      closeChapterList();
+    }
   });
 
   function setStatus(text) {
@@ -1848,6 +1902,7 @@ func (s *Server) handleChapter(w http.ResponseWriter, r *http.Request) {
 		NextN        int
 		ChapterN     int
 		Title        string
+		AllChapters  interface{}
 		KokoroURL    string
 		Voices       []string
 		DefaultVoice string
@@ -1858,6 +1913,7 @@ func (s *Server) handleChapter(w http.ResponseWriter, r *http.Request) {
 		NextN:        nextN,
 		ChapterN:     n,
 		Title:        title,
+		AllChapters:  chapters,
 		KokoroURL:    s.kokoroURL,
 		Voices:       kokoroVoices,
 		DefaultVoice: s.kokoroVoice,