feat(reader): continuous reading mode, seamless infinite scroll, and end-of-chapter nav cards

app/static/index.html

@@ -5,7 +5,7 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, viewport-fit=cover">
     <title>Notes — Персональный тренажер и словарь английского языка</title>
     <meta name="description" content="Защищённый персональный тренажёр и словарь английского языка с интервальными повторениями SRS SM-2, контекстным поиском и озвучкой">
-    <link rel="stylesheet" href="/static/css/style.css?v=3.5">
+    <link rel="stylesheet" href="/static/css/style.css?v=3.6">
     
     <!-- PWA meta and icons -->
     <link rel="manifest" href="/manifest.json">
@@ -965,6 +965,24 @@
             <button id="reader-settings-close-btn" class="popup-close-btn">✕</button>
         </div>
         <div class="reader-settings-body">
+            <!-- Reading Flow Mode -->
+            <div class="setting-row">
+                <span class="setting-label">Режим чтения</span>
+                <div class="setting-segmented-control" id="reader-mode-group">
+                    <button type="button" class="seg-btn active" data-flow="chapters">📖 По главам</button>
+                    <button type="button" class="seg-btn" data-flow="continuous">📜 Вся книга</button>
+                </div>
+            </div>
+
+            <!-- Autoload next chapter toggle (active in chapters mode) -->
+            <div class="setting-row" id="setting-autoload-row">
+                <span class="setting-label">Переход между главами</span>
+                <div class="setting-segmented-control" id="reader-autoload-group">
+                    <button type="button" class="seg-btn active" data-autoload="true">⚡ Автоподгрузка</button>
+                    <button type="button" class="seg-btn" data-autoload="false">🔘 По кнопке</button>
+                </div>
+            </div>
+
             <!-- Font Family -->
             <div class="setting-row">
                 <span class="setting-label">Шрифт</span>
@@ -1056,7 +1074,7 @@
     <!-- Audio Element for native streaming -->
     <audio id="global-audio-player" preload="none"></audio>
 
-    <script src="/static/js/app.js?v=3.5"></script>
+    <script src="/static/js/app.js?v=3.6"></script>
 </body>
 </html>