Ship signup sheet, subscribe reminders, cover crop, and theme updates.

Wire real WeChat app config, prefer activity cover over posters, and add admin cover cropping for the home banner.

Co-authored-by: Cursor <cursoragent@cursor.com>

miniprogram/pages/past/past.wxss

@@ -5,7 +5,28 @@
 .actions {
   display: flex;
   gap: 20rpx;
-  margin-bottom: 4rpx;
+  margin-bottom: 28rpx;
+}
+
+.section-head {
+  display: flex;
+  align-items: center;
+  gap: 14rpx;
+  margin-bottom: 8rpx;
+}
+
+.section-bar {
+  width: 8rpx;
+  height: 32rpx;
+  border-radius: 4rpx;
+  background: #0d8b87;
+}
+
+.section-title {
+  color: #111827;
+  font-size: 32rpx;
+  font-weight: 700;
+  line-height: 1.2;
 }
 
 .btn {
@@ -35,7 +56,7 @@
 }
 
 .empty {
-  margin-top: 160rpx;
+  margin-top: 120rpx;
   text-align: center;
   color: #9ca3af;
   font-size: 28rpx;