Fix learn dialog rendering, add lab publish/draft toggle, bump to v0.1.2

- learn/index.html: restructured dialogs inside section divs to fix scope
- learn/index.html: edit-article dialogs via flat articles list in modal blocks
- LearnController: sectionChoices for select options; secure article fetching
- ContentService: createArticlePlaced: new section adjacent to anchor section
- lab status: published = student-visible, draft = hidden
- lab toggle: click badge in labs list or button in lab header to switch status
- added badge-btn CSS class, removed inline styles
- removed all th:onclick with expressions → data-modal attributes
- footer v0.1.2

web/src/main/resources/templates/admin/labs.html

@@ -7,6 +7,8 @@
         <h1 class="page-title">Лабораторные</h1>
         <button class="btn btn-primary" type="button" onclick="openModal('modal-create-lab')">+ Создать</button>
     </div>
+    <p class="text-sm text-muted mb-4">Статус <b>draft</b> — черновик (редактирование, студентам не видна).
+        <b>published</b> — опубликована (доступна студентам, видны распределённые варианты). Нажмите на бейдж статуса, чтобы переключить.</p>
     <div th:if="${notice}" class="alert alert-success" th:text="${notice}"></div>
     <div th:if="${error}" class="alert alert-error" th:text="${error}"></div>
 
@@ -18,7 +20,14 @@
                 <td th:text="${lab.number}">1</td>
                 <td><a th:href="@{/admin/labs/{id}(id=${lab.id})}" th:text="${lab.title}">—</a></td>
                 <td th:text="${lab.variantCount}">0</td>
-                <td><span class="badge" th:classappend="${lab.status == 'published'} ? 'badge-ok' : 'badge-warn'" th:text="${lab.status}">—</span></td>
+                <td>
+                    <form class="inline-form" th:action="@{/admin/labs/{id}/toggle-status(id=${lab.id})}" method="post">
+                        <input type="hidden" name="_csrf" th:value="${csrfToken}">
+                        <button class="badge badge-btn"
+                                th:classappend="${lab.status == 'published'} ? 'badge-ok' : 'badge-warn'"
+                                type="submit" th:text="${lab.status}">—</button>
+                    </form>
+                </td>
                 <td class="text-center"><form th:action="@{/admin/labs/{id}/delete(id=${lab.id})}" method="post"><input type="hidden" name="_csrf" th:value="${csrfToken}"><button class="btn btn-danger btn-sm" type="submit">Удалить</button></form></td>
             </tr>
             <tr th:if="${#lists.isEmpty(labs)}"><td colspan="5" class="empty">Лабораторных пока нет.</td></tr>