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/user-center-renderers/profile-header.php

@@ -69,21 +69,24 @@ extract($context, EXTR_SKIP); // phpcs:ignore WordPress.PHP.DontExtract.extract_
 			</div>
 		</div>
 		<div class="uc-header__actions">
-			<?php if (!empty($signin_enabled)) : ?>
-			<span data-aksrt-signin>
-				<button
-					type="button"
-					class="btn btn-sm uc-header__signin-btn<?php echo !empty($signin_signed_today) ? ' is-done' : ''; ?>"
-					data-signin-btn
-					data-signin-idle-label="<?php esc_attr_e('签到', 'aksrt'); ?>"
-					data-signin-done-label="<?php esc_attr_e('已签到', 'aksrt'); ?>"
-					<?php disabled(!empty($signin_signed_today)); ?>
-				>
-					<i class="fa fas fa-calendar-check" aria-hidden="true"></i>
-					<span data-signin-label><?php echo !empty($signin_signed_today) ? esc_html__('已签到', 'aksrt') : esc_html__('签到', 'aksrt'); ?></span>
-				</button>
-			</span>
+		<?php if (!empty($signin_enabled)) : ?>
+		<span data-aksrt-signin>
+			<?php if (!empty($signin_signed_today)) : ?>
+				<?php echo aksrt_get_user_checkin_details_link('btn btn-sm uc-header__signin-btn is-done', '<i class="fa fas fa-calendar-check" aria-hidden="true"></i><span>' . esc_html__('已签到', 'aksrt') . '</span>'); // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped ?>
+			<?php else : ?>
+			<button
+				type="button"
+				class="btn btn-sm uc-header__signin-btn"
+				data-signin-btn
+				data-signin-idle-label="<?php esc_attr_e('签到', 'aksrt'); ?>"
+				data-signin-done-label="<?php esc_attr_e('已签到', 'aksrt'); ?>"
+			>
+				<i class="fa fas fa-calendar-check" aria-hidden="true"></i>
+				<span data-signin-label><?php esc_html_e('签到', 'aksrt'); ?></span>
+			</button>
 			<?php endif; ?>
+		</span>
+		<?php endif; ?>
 			<?php if (!empty($messages_url)) : ?>
 			<a href="<?php echo esc_url($messages_url); ?>" class="btn-ghost btn-sm btn-icon uc-header__message-btn" aria-label="<?php esc_attr_e('消息通知', 'aksrt'); ?>" title="<?php esc_attr_e('消息通知', 'aksrt'); ?>">
 				<i class="fa fas fa-bell" aria-hidden="true"></i>