feat(credits): check-in details modal + history; oneline/tilt widgets

Add zibll-like check-in details remote modal (REST/AJAX), history
endpoint, header details link, and keep oneline posts + tilt showcase
widgets from this batch.

inc/helpers/aksrt-header-userbox.php

@@ -39,17 +39,32 @@ if (!function_exists('aksrt_header_user_checkin_btn')) :
 			$signed = false;
 		}
 
+		$details = '';
+		if (function_exists('aksrt_get_remote_modal_link')) {
+			$details = aksrt_get_remote_modal_link([
+				'tag'           => 'a',
+				'class'         => 'aksrt-header-checkin-details muted-2-color em09 mt6 block text-center',
+				'text'          => __('签到详情', 'aksrt'),
+				'query_arg'     => ['action' => 'aksrt_checkin_details_modal'],
+				'data_class'    => 'modal-mini full-sm',
+				'height'        => 420,
+				'mobile_bottom' => true,
+			]);
+		}
+
 		if ($signed) {
 			return '<button type="button" class="but block c-yellow aksrt-header-checkin is-done" disabled>'
 				. '<i class="fa fa-calendar-check-o" aria-hidden="true"></i> '
 				. esc_html__('今日已签到', 'aksrt')
-				. '</button>';
+				. '</button>'
+				. $details;
 		}
 
 		return '<button type="button" class="but block c-yellow aksrt-header-checkin" data-aksrt-checkin="1">'
 			. '<i class="fa fa-calendar-check-o" aria-hidden="true"></i> '
 			. esc_html__('签到领取今日奖励', 'aksrt')
-			. '</button>';
+			. '</button>'
+			. $details;
 	}
 endif;