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/base.html

@@ -897,6 +897,15 @@
       return { wsId: 0, isGitea: false, workspaceKey: wk };
     },
 
+    /** Folder currently open on the local-workspace page (0 when at root). */
+    _currentFolderId: function() {
+      var ws = window._wsData;
+      if (ws && typeof ws.currentFolder === 'number' && ws.currentFolder > 0) {
+        return ws.currentFolder;
+      }
+      return 0;
+    },
+
     /** Return a toast function that works across pages. */
     _toast: function(msg, type) {
       if (window.appState && window.appState.toast) window.appState.toast(msg, type);
@@ -907,14 +916,19 @@
      * Create a new page: opens the v5.12.0 template picker (built-in + the
      * user's saved templates), then instantiates the chosen one.
      */
-    createPage: function() {
+    createPage: function(parentId) {
       var self = this;
+      // Explicit folder (row/context-menu button) wins; otherwise create in the
+      // folder the user is currently browsing on the local-workspace page.
+      if (parentId == null || parentId === '') parentId = this._currentFolderId();
+      this._createParentId = parentId || 0;
       // Direct creation path (fallback / no-template choice).
       this._createPlainPage = function() {
         var ctx = self._getContext();
         if (ctx.wsId > 0) {
           var body = { name: '', type: 'page' };
           if (ctx.isGitea) body.workspace_id = ctx.wsId;
+          if (self._createParentId) body.parent_id = self._createParentId;
           fetch('/api/local-workspace/items', {
             method: 'POST',
             headers: { 'Content-Type': 'application/json', 'X-CSRF-Token': self.getCsrfToken() },
@@ -986,6 +1000,7 @@
       var ctx = self._getContext();
       if (ctx.wsId > 0) { body.workspace_id = ctx.wsId; }
       else if (ctx.workspaceKey) { body.workspace = ctx.workspaceKey; }
+      if (self._createParentId) { body.parent_id = self._createParentId; }
       if (parts[0] === 'key') { body.key = parts.slice(1).join(':'); url = '/board/api/page-templates/0/use'; }
       else { url = '/board/api/page-templates/' + parts[1] + '/use'; }
       fetch(url, {
@@ -999,8 +1014,10 @@
         .catch(function(){ self._createPlainPage(); });
     },
 
-    /** Show the global New Folder modal. */
-    showCreateFolderModal: function() {
+    /** Show the global New Folder modal (parentId = target folder, optional). */
+    showCreateFolderModal: function(parentId) {
+      if (parentId == null || parentId === '') parentId = this._currentFolderId();
+      this._folderParentId = parentId || 0;
       var modal = document.getElementById('fd-global-folder-modal');
       if (!modal) return;
       modal.style.display = 'flex';
@@ -1019,6 +1036,8 @@
       var ctx = this._getContext();
       var body = { name: name, type: 'folder' };
       if (ctx.wsId > 0 && ctx.isGitea) body.workspace_id = ctx.wsId;
+      if (this._folderParentId) body.parent_id = this._folderParentId;
+      this._folderParentId = 0;
 
       var self = this;
       fetch('/api/local-workspace/items', {