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_scripts.html

@@ -2274,16 +2274,45 @@ applyAIBlocks(text){
           setTimeout(()=>{const fe=this.getEl(focusId);if(fe){fe.focus();ce(fe);}},60);
         },
         autoSave(){if(this.fileData)return;clearTimeout(this.st);this.st=setTimeout(()=>this.save(),1500);},
+        // Reflect the page title in the left navigation, the header breadcrumb
+        // and the browser tab as soon as it changes.
+        _syncTitleUI(){
+          const title=(this.pageTitle||'').trim()||'Untitled';
+          document.querySelectorAll(`.sidebar-item[data-page-id="page/${this.pid}"]`).forEach(item=>{const n=item.querySelector('.page-name');if(n)n.textContent=title;});
+          document.querySelectorAll(`.sidebar-item.ws-tree-item[data-id="${this.pid}"]`).forEach(item=>{item.setAttribute('data-name',title);const n=item.querySelector('.page-name');if(n)n.textContent=title;});
+          document.title='FlowDeck — '+title;
+          window.dispatchEvent(new CustomEvent('flowdeck:page-renamed',{detail:{id:this.pid,title:title}}));
+          if(window.parent&&window.parent!==window){try{window.parent.postMessage({type:'fd-page-renamed',id:this.pid,title:title},window.location.origin);}catch(e){}}
+        },
         save(cb){
-          if(this.fileData)return;
+          if(this.fileData){
+            // File page: only the title is editable here. Sync the sidebar,
+            // header breadcrumb and browser tab live, and persist the title
+            // without rewriting the file's blocks.
+            const t=document.getElementById('_titleEl');if(t)this.pageTitle=t.textContent?.trim()||'';
+            this._syncTitleUI();
+            if(this._fileTitleT)clearTimeout(this._fileTitleT);
+            this._fileTitleT=setTimeout(()=>{
+              this._fileTitleT=null;
+              const title=(this.pageTitle||'').trim();
+              if(!title)return;
+              const csrf=document.cookie.match(/csrf_token=([^;]+)/);
+              fetch(`/board/api/pages/${this.pid}?title=${encodeURIComponent(title)}`,{method:'PUT',headers:{'X-CSRF-Token':csrf?csrf[1]:''}})
+                .then(()=>{this.dirty=false;})
+                .catch(()=>{});
+            },600);
+            if(cb)cb();
+            return;
+          }
+          const t=document.getElementById('_titleEl');if(t)this.pageTitle=t.textContent?.trim()||'';
+          this._syncTitleUI();
           if(this.saving){ if(cb) cb(); return; }
           this.sync();
-          const t=document.getElementById('_titleEl');if(t)this.pageTitle=t.textContent?.trim()||'';
           this.saving=true;
           const csrf=document.cookie.match(/csrf_token=([^;]+)/);
           fetch(`/board/api/pages/${this.pid}/blocks`,{method:'POST',headers:{'Content-Type':'application/json','X-CSRF-Token':csrf?csrf[1]:''},body:JSON.stringify({title:this.pageTitle,blocks:this.blocks.map(b=>{const c={id:b.id,type:b.type,content:b.content};['checked','expanded','language','icon','src','embed_src','embed_provider','alt','style','embed_type','collection_id','dbs','file_name','file_size','file_mime','children','rows','align','has_header','first_col_header','colsW','meeting','automation_id','automation_name'].forEach(k=>{if(b[k]!=null)c[k]=b[k];});return c;})})})
           .then(r=>r.json()).then(()=>{this.saving=false;this.dirty=false;this.lastSaved=new Date().toLocaleTimeString();
-            document.querySelectorAll(`.sidebar-item[data-page-id="page/${this.pid}"]`).forEach(item=>{const n=item.querySelector('.page-name');if(n)n.textContent=this.pageTitle||'New page';});
+            this._syncTitleUI();
             if(cb)cb();
           }).catch(()=>{this.saving=false;});
         },