fix: auto-save met à jour le titre du sidebar sans recharger la page

- sidebar items: attribut data-page-id ajouté pour ciblage DOM
- save(): après PUT réussi, met à jour .page-name dans le sidebar
- saveTitle(): reload la page (changement de titre = reload ok)

app/templates/base.html

@@ -56,7 +56,8 @@
         {% for page in recent_pages %}
         <li class="sidebar-item {% if page.active %}active{% endif %} {% if page.indent %}indent-{{ page.indent }}{% endif %}"
             @click="navigateTo('{{ page.url }}')"
-            @contextmenu.prevent="showContextMenu($event, '{{ page.id }}', '{{ page.name }}')">
+            @contextmenu.prevent="showContextMenu($event, '{{ page.id }}', '{{ page.name }}')"
+            data-page-id="{{ page.id }}">
           <span class="page-icon">{{ page.icon }}</span>
           <span class="page-name">{{ page.name }}</span>
           <span class="item-actions">
@@ -89,7 +90,8 @@
         {% for page in private_pages %}
         <li class="sidebar-item {% if page.active %}active{% endif %} {% if page.indent %}indent-{{ page.indent }}{% endif %}"
             @click="navigateTo('{{ page.url }}')"
-            @contextmenu.prevent="showContextMenu($event, '{{ page.id }}', '{{ page.name }}')">
+            @contextmenu.prevent="showContextMenu($event, '{{ page.id }}', '{{ page.name }}')"
+            data-page-id="{{ page.id }}">
           <span class="page-icon">{{ page.icon }}</span>
           <span class="page-name">{{ page.name }}</span>
           <span class="item-actions">
@@ -134,7 +136,8 @@
         {% for page in favorite_pages %}
         <li class="sidebar-item {% if page.active %}active{% endif %}"
             @click="navigateTo('{{ page.url }}')"
-            @contextmenu.prevent="showContextMenu($event, '{{ page.id }}', '{{ page.name }}')">
+            @contextmenu.prevent="showContextMenu($event, '{{ page.id }}', '{{ page.name }}')"
+            data-page-id="{{ page.id }}">
           <span class="page-icon">{{ page.icon }}</span>
           <span class="page-name">{{ page.name }}</span>
           <span class="item-actions">