fix(addon-search): cancel pending highlight refresh on clear

Clear the debounced highlight timeout when decorations are cleared to
avoid stale delayed searches.

Co-authored-by: Cursor <cursoragent@cursor.com>

addons/addon-search/src/SearchAddon.ts

@@ -79,6 +79,7 @@ export class SearchAddon extends Disposable implements ITerminalAddon, ISearchAp
   }
 
   public clearDecorations(retainCachedSearchTerm?: boolean): void {
+    this._highlightTimeout.clear();
     this._resultTracker.clearSelectedDecoration();
     this._decorationManager?.clearHighlightDecorations();
     this._resultTracker.clearResults();