feat: Add chapter intro delay setting and implement in conversion process

abogen/web/templates/job_detail.html

@@ -23,6 +23,7 @@
         <li><strong>Merge at end:</strong> {{ 'Yes' if job.merge_chapters_at_end else 'No' }}</li>
         <li><strong>Separate chapter format:</strong> {{ job.separate_chapters_format|upper }}</li>
         <li><strong>Silence between chapters:</strong> {{ '%.1f'|format(job.silence_between_chapters) }}s</li>
+        <li><strong>Chapter intro delay:</strong> {{ '%.1f'|format(job.chapter_intro_delay) }}s</li>
         <li><strong>Max words per subtitle:</strong> {{ job.max_subtitle_words }}</li>
         <li><strong>Project folder:</strong> {{ 'Yes' if job.save_as_project else 'No' }}</li>
       </ul>

abogen/web/templates/prepare_job.html

@@ -29,6 +29,10 @@
         <dt>Characters</dt>
         <dd>{{ pending.total_characters|default(0) }}</dd>
       </div>
+      <div>
+        <dt>Chapter intro delay</dt>
+        <dd>{{ '%.1f'|format(pending.chapter_intro_delay) }} seconds</dd>
+      </div>
     </dl>
     {% if pending.metadata_tags %}
     <div class="prepare-metadata">
@@ -105,6 +109,13 @@
       </article>
       {% endfor %}
     </div>
+    <div class="prepare-options">
+      <div class="field">
+        <label for="chapter_intro_delay">Pause after chapter titles (seconds)</label>
+        <input type="number" step="0.1" min="0" id="chapter_intro_delay" name="chapter_intro_delay" value="{{ '%.2f'|format(pending.chapter_intro_delay) }}">
+        <p class="hint">Set to 0 to disable the pause after speaking each chapter title.</p>
+      </div>
+    </div>
     <div class="prepare-actions">
       <button type="submit" class="button">Queue conversion</button>
       <button type="submit" class="button button--ghost" form="cancel-form">Cancel</button>

abogen/web/templates/settings.html

@@ -86,6 +86,11 @@
   <label for="silence_between_chapters">Silence Between Chapters (Seconds)</label>
         <input type="number" step="0.5" min="0" id="silence_between_chapters" name="silence_between_chapters" value="{{ settings.silence_between_chapters }}">
       </div>
+  <div class="field">
+  <label for="chapter_intro_delay">Pause After Chapter Titles (Seconds)</label>
+    <input type="number" step="0.1" min="0" id="chapter_intro_delay" name="chapter_intro_delay" value="{{ '%.2f'|format(settings.chapter_intro_delay) }}">
+    <p class="hint">Inserted between the spoken chapter title and the chapter content. Set to 0 to disable.</p>
+  </div>
       <div class="field">
   <label for="max_subtitle_words">Max Words Per Subtitle Entry</label>
         <input type="number" min="1" max="200" id="max_subtitle_words" name="max_subtitle_words" value="{{ settings.max_subtitle_words }}">