fix: fix columns track by in @for loop

Author: walkerkay

packages/gantt/src/components/table/body/gantt-table-body.component.html

@@ -51,7 +51,7 @@
             [ngTemplateOutlet]="rowBeforeTemplate"
             [ngTemplateOutletContext]="{ $implicit: item.origin, item: item.origin }"
           ></ng-template>
-          @for (column of columns; track column; let first = $first) {
+          @for (column of columns; track $index; let first = $first) {
             <div [classList]="column.classList" [style.width]="column.columnWidth">
               <!-- drag icon -->
               @if (first && draggable) {

packages/gantt/src/components/table/header/gantt-table-header.component.html

@@ -1,5 +1,5 @@
 <div class="gantt-table-header-container">
-  @for (column of columns; track column; let i = $index) {
+  @for (column of columns; track $index) {
     <div class="gantt-table-column" [style.width]="column.columnWidth">
       @if (column.headerTemplateRef) {
         <ng-container [ngTemplateOutlet]="column.headerTemplateRef"> </ng-container>