feat(workspace,editor): creation dans le dossier courant + sync live du titre (sidebar/header)

- creation fichier/dossier a la racine du dossier courant ou d'un dossier cible (context-menu, boutons de survol) via createPage/showCreateFolderModal(parentId)
- instances de modeles en tant qu'enfant d'un dossier (parent_id) ; nom vide -> 'Untitled'
- sidebar de la librairie rafraichi apres delete/move/duplicate/rename (_syncSidebar)
- editeur: le titre se synchronise en direct dans le sidebar, le breadcrumb et l'onglet (pages et fichiers) et persiste via PUT /board/api/pages/{id}

app/templates/page_editor.html

@@ -2,6 +2,7 @@
 page_title %}{{ page.title }}{% endblock %} {% block topbar %}
 {% set page_icon = "file" if page.content_format != 'file' else "paperclip" %}
 {% set page_title = page.title %}
+{% set nav_page_id = page.id %}
 {% set right_actions = '<span class="topbar-edited" style="cursor:pointer;" @click="window.E && window.E.toggleActivityOpen()">Edited <span x-text="window.E && window.E.timeAgo || \'\'"></span> ▾</span><button class="topbar-btn" @click="window.E && window.E.toggleComments()" title="Comments"><span class="fd-comment-btn-ico">💬</span><span class="fd-comment-count" x-text="window.E && window.E.commentCount>0 ? window.E.commentCount : \'\'"></span></button><button class="topbar-btn share-btn" @click="window.E && window.E.toggleShareOpen()"><span x-show="!window.E || !window.E.pageIsShared">' ~ fd_icon("lock",14) ~ ' Share ▾</span><span x-show="window.E && window.E.pageIsShared" title="This page is shared">👥 Shared ▾</span></button><button class="topbar-btn" @click="window.E && window.E.copyPageLink()" title="Copy link">' ~ fd_icon("link",14) ~ '</button><button class="topbar-btn star-btn" @click="window.E && window.E.toggleFavorite()" x-html="(window.E && window.E.favorited) ? getSvgIcon(\'star\',14) : getSvgIcon(\'star\',14)"></button><button class="topbar-btn relative" @click="window.E && window.E.toggleMoreOpen()">⋯</button>' %}
 {% include '_header.html' %}
 {% endblock %} {% block content %}