feat(checkin): open reference-parity details modal from signed buttons

- Rebuild checkin details modal HTML 1:1 with reference theme:
  colorful header c-blue, user card (points/level), daily reward
  card and 7-day continuous mini cards
- Signed entry buttons (header dropdown, user-card badge, user
  center) become clickable checkin-details-link modal triggers
  instead of disabled buttons
- Swap data-signin-btn to details link in place after successful
  signin (reference .initiate-checkin replacement behavior)
- Add aksrt-checkin-details-modal runtime shell (modal-mini 400px)
- Remove dead code: legacy lite modal, admin-ajax details handler,
  /signin/history route, signin calendar; rebuild public bundles
- Update contract tests to the new checkin modal contract

inc/helpers/aksrt-header-userbox.php

@@ -7,6 +7,29 @@
 
 defined('ABSPATH') || exit;
 
+if (!function_exists('aksrt_get_user_checkin_details_link')) :
+	/**
+	 * 已签到详情弹窗触发链接（参考主题 zib_get_user_checkin_details_link 1:1）：
+	 * 打开刷新式 mini 弹窗（高 240，移动端底部弹出，每次都重新拉取）。
+	 *
+	 * @param string $class 沿用入口按钮的类。
+	 * @param string $text  链接内文（含图标）。
+	 */
+	function aksrt_get_user_checkin_details_link(string $class = '', string $text = ''): string {
+		$class = trim($class . ' checkin-details-link');
+
+		return '<a class="' . esc_attr($class) . '" href="javascript:;"'
+			. ' data-aksrt-modal="remote"'
+			. ' data-aksrt-modal-url="' . esc_url(rest_url('aksrt/v1/signin/details')) . '"'
+			. ' data-aksrt-modal-class="aksrt-checkin-details-modal modal-mini"'
+			. ' data-aksrt-modal-height="240"'
+			. ' data-aksrt-modal-mobile-bottom="true"'
+			. ' data-aksrt-modal-cache="false">'
+			. $text
+			. '</a>';
+	}
+endif;
+
 if (!function_exists('aksrt_header_user_checkin_btn')) :
 	/**
 	 * Check-in CTA for header dropdown and compact card placements.
@@ -31,27 +54,36 @@ if (!function_exists('aksrt_header_user_checkin_btn')) :
 
 		$signed = \AKSRT\Credits\Signin::get_instance()->is_signed_today($user_id);
 
+		// 已签到：与参考主题一致，入口按钮变为签到详情弹窗触发链接（可点击）。
+		if ($signed) {
+			$icon = '<i class="fa fas fa-calendar-check ml3 mr6" aria-hidden="true"></i>';
+			if ($class !== null) {
+				// 用户卡片签到书签：保留书签类与 is-done 视觉，仅将行为切换为打开详情弹窗。
+				return aksrt_get_user_checkin_details_link(
+					$class . ' is-done',
+					$icon . '<span>' . esc_html__('已签到', 'aksrt') . '</span>'
+				);
+			}
+			return aksrt_get_user_checkin_details_link(
+				'but block c-yellow aksrt-header-checkin is-done',
+				'<i class="fa fas fa-calendar-check" aria-hidden="true"></i> ' . esc_html($compact ? __('已签到', 'aksrt') : __('今日已签到', 'aksrt'))
+			);
+		}
+
 		$classes = $class ?? ('but block c-yellow aksrt-header-checkin' . ($compact ? ' aksrt-header-checkin--compact' : ''));
 
 		// Card badge variant (explicit $class, e.g. the user-card 签到 badge):
 		// reference parity renders an <a> so the badge inherits the card font
 		// instead of the UA button stylesheet (font/UI 1:1 with the reference).
 		if ($class !== null) {
-			return '<a class="' . esc_attr($classes . ($signed ? ' is-done' : '')) . '" href="javascript:;" data-signin-btn'
+			return '<a class="' . esc_attr($classes) . '" href="javascript:;" data-signin-btn'
 				. ' data-signin-idle-label="' . esc_attr__('签到', 'aksrt') . '"'
 				. ' data-signin-done-label="' . esc_attr__('已签到', 'aksrt') . '">'
 				. '<i class="fa fas fa-calendar-check ml3 mr6" aria-hidden="true"></i>'
-				. '<span data-signin-label>' . esc_html($signed ? __('已签到', 'aksrt') : __('签到', 'aksrt')) . '</span>'
+				. '<span data-signin-label>' . esc_html__('签到', 'aksrt') . '</span>'
 				. '</a>';
 		}
 
-		if ($signed) {
-			return '<button type="button" class="' . esc_attr($classes . ' is-done') . '" data-signin-btn data-signin-idle-label="' . esc_attr__('签到', 'aksrt') . '" data-signin-done-label="' . esc_attr__('已签到', 'aksrt') . '" disabled>'
-				. '<i class="fa fas fa-calendar-check" aria-hidden="true"></i>'
-				. '<span data-signin-label>' . esc_html($compact ? __('已签到', 'aksrt') : __('今日已签到', 'aksrt')) . '</span>'
-				. '</button>';
-		}
-
 		return '<button type="button" class="' . esc_attr($classes) . '" data-signin-btn data-signin-idle-label="' . esc_attr__('签到', 'aksrt') . '" data-signin-done-label="' . esc_attr__('已签到', 'aksrt') . '">'
 			. '<i class="fa fas fa-calendar-check" aria-hidden="true"></i>'
 			. '<span data-signin-label>' . esc_html($compact ? __('签到', 'aksrt') : __('签到领取今日奖励', 'aksrt')) . '</span>'