feat: add Complete Tutorial to sidebar navigation

- Add tutorial link to English navigation: "📚 Complete Tutorial"
- Add tutorial link to Japanese navigation: "📚 完全チュートリアル"
- Position tutorial link before "1 Page" in both languages
- Use active state when browsing tutorial pages
- Make comprehensive tutorial easily accessible from main navigation

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: koriym

_includes/manuals/1.0/en/contents.html

@@ -43,6 +43,7 @@
             <li class="nav-item"><a class="nav-link {% if page.permalink == '/manuals/1.0/en/performance_boost.html' %}active{% endif %}" href="/manuals/1.0/en/performance_boost.html">Performance</a></li>
             <li class="nav-item"><a class="nav-link {% if page.permalink == '/manuals/1.0/en/backward_compatibility.html' %}active{% endif %}" href="/manuals/1.0/en/backward_compatibility.html">Compatibility</a></li>
             <li class="nav-item"><a class="nav-link {% if page.permalink == '/manuals/1.0/en/ai-assistant.html' %}active{% endif %}" href="/manuals/1.0/en/ai-assistant.html">AI Assistant</a></li>
+            <li class="nav-item"><a class="nav-link {% if page.url contains '/tutorial/' %}active{% endif %}" href="/tutorial/">📚 Complete Tutorial</a></li>
             <li class="nav-item"><a class="nav-link {% if page.permalink == '/manuals/1.0/en/1page.html' %}active{% endif %}" href="/manuals/1.0/en/1page.html">1 Page</a></li>
         </ul>
     </div>

_includes/manuals/1.0/ja/contents.html

@@ -44,6 +44,7 @@
             <li class="nav-item"><a class="nav-link {% if page.permalink == '/manuals/1.0/ja/backward_compatibility.html' %}active{% endif %}" href="/manuals/1.0/ja/backward_compatibility.html">後方互換性</a></li>
             <li class="nav-item"><a class="nav-link {% if page.permalink == '/manuals/1.0/ja/tutorial1.html' %}active{% endif %}" href="/manuals/1.0/ja/tutorial1.html">チュートリアル</a></li>
             <li class="nav-item"><a class="nav-link {% if page.permalink == '/manuals/1.0/ja/ai-assistant.html' %}active{% endif %}" href="/manuals/1.0/ja/ai-assistant.html">AIアシスタント</a></li>
+            <li class="nav-item"><a class="nav-link {% if page.url contains '/tutorial/' %}active{% endif %}" href="/tutorial/">📚 完全チュートリアル</a></li>
             <li class="nav-item"><a class="nav-link {% if page.permalink == '/manuals/1.0/ja/1page.html' %}active{% endif %}" href="/manuals/1.0/ja/1page.html">1 Page</a></li>
         </ul>
     </div>