Stage transaction creations without copying full tables per command

src/lib/canvas-core/editor.ts

@@ -1,3 +1,4 @@
+import {stageCreation,materializeCreations} from './creation-draft.ts';
 import type { Applied, Availability, Capability, Change, Command, Commit, CoreSnapshot, Document, ElementRecord, Geometry, HistoryEntry, HistoryState, Id, OperationIntent, Origin, Registry, Result, Snapshot } from './types.ts';
 import { applyChanges, createDocument, invert, targetElement, validateDocument } from './document.ts';
 import { clone, equal, fault, freeze, readMap, reject, validJson } from './values.ts';
@@ -117,7 +118,7 @@ export function createEditor<Runtime = undefined>(options: EditorOptions<Runtime
         changes = output;
       }
     }
-    const next = applyChanges(document, changes);
+    const next = command.type==='element.create'||command.type==='canvas.create'?stageCreation(document,changes[0] as Extract<Change,{kind:'canvas'|'element'}>):applyChanges(document, changes);
     return { document: next, changes: freeze(clone(changes)) };
   }
 
@@ -221,6 +222,7 @@ export function createEditor<Runtime = undefined>(options: EditorOptions<Runtime
       active = false;
       if (isThenable(result)) { Promise.resolve(result).catch(() => {}); throw fault('async_transaction'); }
       if (failed) throw failed;
+      document=materializeCreations(document);
       validateDocument(document, options.registry);
       if (!changes.length || documentsEqual(document, state.document)) return Object.freeze({ status: 'applied', revision: state.revision, operationIds: Object.freeze([]) });
       let history = state.history, historyEntryId: Id | undefined;