fix to not add buttons all the time

Author: willwade

src/core/treeStructure.ts

@@ -487,6 +487,22 @@ export class AACPage {
     this._pendingMutations.push({ type: 'addButton', button });
   }
 
+  /**
+   * Internal load-path button push: adds a button to the page WITHOUT recording a mutation.
+   * Used by processors during loadIntoTree so the loaded baseline isn't treated as user changes.
+   * Not part of the public API — consumers should always use addButton.
+   */
+  _loadButton(button: AACButton): void {
+    this.buttons.push(button);
+
+  /**
+   * Discard all recorded mutations on this page.
+   * Useful as an escape hatch after loadIntoTree if the consumer wants a clean baseline.
+   */
+  clearMutations(): void {
+    this._pendingMutations = [];
+  }
+
   /**
    * Get the list of pending mutations for this page (read-only)
    */

src/processors/gridsetProcessor.ts

@@ -1749,8 +1749,8 @@ class GridsetProcessor extends BaseProcessor {
               },
             });
 
-            // Add button to page
-            page.addButton(button);
+            // Add button to page (load path: do not record as a user mutation)
+            page._loadButton(button);
 
             // Place button in grid layout (handle colspan/rowspan)
             for (let r = cellY; r < cellY + rowSpan && r < maxRows; r++) {