fix(tests): restore green contract suite

Drop the legacy credits_added message label per the hard-cut rule, switch
three remaining Font Awesome 4 icons to FA5 solid, and align two widget
contracts with the badge rule grouping and renderer list from fc04bf65.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/WidgetSystem/WidgetDefinition.php

@@ -103,7 +103,7 @@ final class WidgetDefinition {
 			'sidebar' => __('此模块只适合添加到侧边栏', 'aksrt'),
 		];
 		if (isset($reminders[$this->size])) {
-			$header[] = ['type' => 'submessage', 'style' => 'warning', 'content' => '<i class="fa fa-fw fa-info-circle"></i>' . esc_html($reminders[$this->size])];
+			$header[] = ['type' => 'submessage', 'style' => 'warning', 'content' => '<i class="fas fa-fw fa-info-circle"></i>' . esc_html($reminders[$this->size])];
 		}
 		$common = CommonFields::for_definition($this->common);
 		if ($common && $this->fields) {