feat(widgets): per-tab topics/limit_day/pay_type filters

TabPosts each tab can filter topics taxonomy, date window and pay type;
REST and widget-set.js pass the extra query args.

src/AKSRT/Core/WidgetAjax.php

@@ -93,7 +93,10 @@ class WidgetAjax {
 			'orderby'     => sanitize_key((string) ($request->get_param('orderby') ?? 'date')),
 			'count'       => max(0, min(20, (int) ($request->get_param('tab_count') ?? 0))),
 			'enabled'     => true,
-		];
+		
+			'topics'      => sanitize_text_field((string) ($request->get_param('topics') ?? '')),
+			'limit_day'   => max(0, (int) ($request->get_param('limit_day') ?? 0)),
+			'pay_type'    => sanitize_key((string) ($request->get_param('pay_type') ?? '')),];
 		$opts = [
 			'style'       => $style,
 			'paginate'    => $paginate,