task(G3): title block with attributes - frame + attributed texts (ATTDEF convention), auto-insert as layout frame block

frontend/src/components/LayoutBar.tsx

@@ -9,6 +9,7 @@
 import React, { useCallback, useEffect, useState } from 'react';
 import type { LayoutDefinition } from '../types/cad.types';
 import { getActiveDocument, onActiveDocumentChanged } from '../kernel/document/documentService';
+import { insertTitleBlockForLayout } from '../services/titleBlockService';
 
 export interface LayoutView {
   center: { x: number; y: number };
@@ -172,6 +173,21 @@ const LayoutBar: React.FC<LayoutBarProps> = ({ doc: docProp, bridge: bridgeProp
                   </svg>
                   <span className="layout-bar-name">{l.name}</span>
                 </button>
+                <button
+                  type="button"
+                  className="layout-bar-tb"
+                  title={`Titelblock für ${l.name} einfügen/aktualisieren`}
+                  onClick={() => {
+                    if (!doc) return;
+                    insertTitleBlockForLayout(doc as never, l.id, {
+                      project: l.name,
+                      date: new Date().toISOString().slice(0, 10),
+                      scale: `1:${Math.max(1, Math.round(1 / (l.viewport.scale || 1)))}`,
+                      author: 'WebCAD',
+                    });
+                    reload();
+                  }}
+                >🏷</button>
                 <button
                   type="button"
                   className="layout-bar-del"