修复 person-detail 按钮文字未居中

原因：微信 <button> 自带 min-height 88rpx 和固有 line-height，
会顶歪自定义高度。改用 <view> + flex 居中。

- 5 个 button 改为 view（保留 class/bindtap/data-id）
- action-btn / edit-btn / delete-btn 改 flex 居中
- add-btn 加 inline-flex 居中

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pages/person-detail/person-detail.wxss

@@ -68,7 +68,9 @@
 .action-btn {
   flex: 1;
   height: 72rpx;
-  line-height: 72rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
   border-radius: 12rpx;
   font-size: 26rpx;
   font-weight: 500;
@@ -122,8 +124,11 @@
   color: #FAF6ED;
   border-radius: 36rpx;
   font-size: 22rpx;
-  border: none;
   font-weight: 500;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  line-height: 1.4;
 }
 
 .add-btn::after {
@@ -258,7 +263,9 @@
 .delete-btn {
   flex: 1;
   height: 60rpx;
-  line-height: 60rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
   border-radius: 10rpx;
   font-size: 22rpx;
   border: 1rpx solid #E8E2D5;