fix: création fichier/dossier instantanée sans refresh de page

Avant: doCreate() appelait _reloadAfterAction() → page reload → le
nouvel élément ne s'affichait pas immédiatement dans l'arbre.

Après: insertion AJAX du nouveau node dans this.tree via
_insertIntoParent(). Le parent est auto-expandé. displayTree mis à jour
si aucun filtre actif. Plus besoin de refresh.

Reste reload pour rename/delete/upload (complexité renderChildren).

app/templates/local_workspace.html

@@ -668,13 +668,52 @@ document.addEventListener('alpine:init', function() {
         body:JSON.stringify(body)
       });
       if (r.ok) {
+        var d = await r.json();
         this.showCreate = false;
         this.parentFolder = null;
         this.newName = '';
-        this._reloadAfterAction();
+        // Insert new node into tree without reload
+        var isFolder = this.createType === 'folder';
+        var newNode = {
+          id: d.id, db_id: d.id, name: d.name || n,
+          is_folder: isFolder, type: isFolder ? 'folder' : 'page',
+          content_format: isFolder ? null : 'blocks',
+          children: [], has_children: false, depth: 0
+        };
+        if (this.parentFolder && this.parentFolder.db_id) {
+          // Insert as child of parent folder
+          this._insertIntoParent(this.tree, this.parentFolder.db_id, newNode);
+          // Auto-expand parent so the new item is visible
+          this.expanded[this.parentFolder.db_id] = true;
+          this.expanded = Object.assign({}, this.expanded);
+        } else {
+          // Insert at root
+          this.tree.unshift(newNode);
+        }
+        // Update displayTree
+        if (!this.searchQuery && !this.filterType) {
+          this.displayTree = this.tree;
+        }
+        this._saveExpandedState();
       }
     },
 
+    _insertIntoParent(nodes, parentId, newNode) {
+      for (var i=0; i<nodes.length; i++) {
+        if (nodes[i].id === parentId) {
+          if (!nodes[i].children) nodes[i].children = [];
+          nodes[i].children.unshift(newNode);
+          nodes[i].has_children = true;
+          newNode.depth = (nodes[i].depth || 0) + 1;
+          return true;
+        }
+        if (nodes[i].children && this._insertIntoParent(nodes[i].children, parentId, newNode)) {
+          return true;
+        }
+      }
+      return false;
+    },
+
     openPage(id) { window.location = '/pages/'+id; },
 
     startRename(node) {