feat: harden phase one workflows

miniapp/miniprogram/pages/second-hand/create.wxss

@@ -1,5 +1,78 @@
-.radio {
-  display: block;
-  height: 60rpx;
-  line-height: 60rpx;
+.page-heading {
+  margin-bottom: 22rpx;
+}
+
+.publish-form {
+  padding-bottom: 28rpx;
+}
+
+.radio-grid {
+  display: grid;
+  grid-template-columns: repeat(2, 1fr);
+  gap: 12rpx;
+  margin-bottom: 20rpx;
+}
+
+.radio {
+  min-height: 72rpx;
+  display: flex;
+  align-items: center;
+  padding: 0 14rpx;
+  color: #334155;
+  background: #f8fafc;
+  border: 1rpx solid #e2e8f0;
+  border-radius: 14rpx;
+  font-size: 24rpx;
+}
+
+.image-grid {
+  display: grid;
+  grid-template-columns: repeat(3, 1fr);
+  gap: 12rpx;
+  margin: 20rpx 0;
+}
+
+.image-item,
+.image-picker {
+  width: 100%;
+  aspect-ratio: 1;
+  margin: 0;
+}
+
+.image-item {
+  position: relative;
+  overflow: hidden;
+  border-radius: 14rpx;
+  background: #eef3f7;
+}
+
+.image-item image {
+  width: 100%;
+  height: 100%;
+}
+
+.remove {
+  position: absolute;
+  right: 8rpx;
+  bottom: 8rpx;
+  margin: 0;
+  font-size: 22rpx;
+  color: #ffffff;
+  background: rgba(15, 23, 42, 0.62);
+}
+
+.image-picker {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border: 1rpx dashed #8aa0b5;
+  color: #33536f;
+  background: #f8fafc;
+  border-radius: 14rpx;
+  font-size: 26rpx;
+  font-weight: 700;
+}
+
+.action-button {
+  margin-top: 8rpx;
 }