docs: update extensible table docs with infinite scroll and multiple selection features

Co-authored-by: sumeyyeKurtulus <92928815+sumeyyeKurtulus@users.noreply.github.com>

docs/en/framework/ui/angular/extensions-overall.md

@@ -32,10 +32,72 @@ Using [ngx-datatable](https://github.com/swimlane/ngx-datatable) in extensible t
       /> 
 ````
 
- * `       actionsText : ` ** Column name of action column. **Type** : string
- * `              data : ` Items shows in your table. **Type** : Array<any>
- * `              list : ` Instance of ListService. **Type** : ListService
- * `actionsColumnWidth : ` Width of your action column. **Type** : number
- * `   actionsTemplate : ` Template of the action when "click this button" or whatever. Generally ng-template. **Type** : TemplateRef<any>
- * `      recordsTotal : ` Count of the record total. **Type** : number
- * `    tableActivate  : ` The Output(). A cell or row was focused via the keyboard or a mouse click. **Type** : EventEmitter() 
+ * `       actionsText : ` Column name of action column. **Type** : `string`
+ * `              data : ` Items shown in your table. **Type** : `Array<any>`
+ * `              list : ` Instance of ListService. **Type** : `ListService`
+ * `actionsColumnWidth : ` Width of your action column. **Type** : `number`
+ * `   actionsTemplate : ` Template of the action (e.g. an `ng-template`). **Type** : `TemplateRef<any>`
+ * `      recordsTotal : ` Total count of records. **Type** : `number`
+ * `    tableActivate  : ` Output fired when a cell or row is focused via keyboard or mouse click. **Type** : `EventEmitter`
+
+### Multiple Selection
+
+The extensible table supports both single-row and multi-row selection. Use the `selectable` input to enable selection, and `selectionType` to control the selection mode.
+
+````ts
+<abp-extensible-table
+  [data]="items"
+  [recordsTotal]="totalCount"
+  [list]="list"
+  [selectable]="true"
+  [selectionType]="'multiClick'"
+  [selected]="selectedRows"
+  (selectionChange)="onSelectionChange($event)"
+/>
+````
+
+When `selectionType` is `'single'`, each row displays a **radio button** and the header does not show a "select all" checkbox. For all other selection types (e.g. `'multiClick'`, `'checkbox'`), each row shows a **checkbox** and the header includes a "select all" checkbox.
+
+ * `        selectable : ` Enables the row selection column. **Type** : `boolean`, **Default** : `false`
+ * `   selectionType  : ` Controls the selection mode. Accepts `SelectionType` values such as `'single'`, `'multi'`, `'multiClick'`, `'checkbox'`, or `'cell'`. **Type** : `SelectionType | string`, **Default** : `'multiClick'`
+ * `        selected  : ` The currently selected rows. **Type** : `any[]`, **Default** : `[]`
+ * ` selectionChange  : ` Output fired when the selection changes. **Type** : `EventEmitter<any[]>`
+
+### Infinite Scroll
+
+The extensible table supports infinite scrolling as an alternative to pagination. When enabled, the table emits a `loadMore` event as the user scrolls near the bottom, allowing you to load additional data on demand. Pagination is hidden while infinite scroll is active.
+
+````ts
+<abp-extensible-table
+  [data]="items"
+  [recordsTotal]="totalCount"
+  [list]="list"
+  [infiniteScroll]="true"
+  [isLoading]="isLoading"
+  [tableHeight]="500"
+  [scrollThreshold]="10"
+  (loadMore)="onLoadMore()"
+/>
+````
+
+In your component, append newly fetched data to the existing `items` array when `loadMore` fires:
+
+````ts
+onLoadMore(): void {
+  if (this.isLoading) return;
+  this.isLoading = true;
+  // fetch next page and append results
+  this.myService.getList({ skipCount: this.items.length, maxResultCount: 10 }).subscribe(result => {
+    this.items = [...this.items, ...result.items];
+    this.isLoading = false;
+  });
+}
+````
+
+> **Note:** When `infiniteScroll` is `true`, set a fixed `tableHeight` so the table has a scrollable viewport. Pagination is automatically hidden.
+
+ * `  infiniteScroll  : ` Enables infinite scroll mode (hides pagination). **Type** : `boolean`, **Default** : `false`
+ * `     isLoading   : ` Indicates that more data is being fetched. Prevents duplicate `loadMore` events and shows a loading indicator. **Type** : `boolean`, **Default** : `false`
+ * `   tableHeight   : ` Fixed height of the table in pixels when `infiniteScroll` is enabled. **Type** : `number`
+ * ` scrollThreshold : ` Distance from the bottom (in pixels) at which `loadMore` is triggered. **Type** : `number`, **Default** : `10`
+ * `      loadMore   : ` Output fired when the user scrolls near the bottom of the table (only when `infiniteScroll` is `true` and `isLoading` is `false`). **Type** : `EventEmitter<void>`