修复侧边栏图片圆角不显示的问题

frontend/src/core/components/form/sidebar/AttachmentSection.vue

@@ -263,10 +263,16 @@ const deleteAttachment = (attachment: any) => {
 .image-attachment img {
   width: 100%;
   height: auto;
-  border-radius: 6px;
+  border-radius: 8px;
   object-fit: contain;
   cursor: pointer;
   transition: transform 0.2s ease;
+  overflow: hidden !important;
+}
+
+.image-container {
+  position: relative;
+  border-radius: 12px;
 }
 
 .image-attachment img:hover {
@@ -282,10 +288,6 @@ const deleteAttachment = (attachment: any) => {
   z-index: 10;
 }
 
-.image-container {
-  position: relative;
-}
-
 .image-container img:hover + .image-overlay,
 .image-container .image-overlay:hover {
   opacity: 1;

frontend/src/core/components/form/sidebar/ImageSection.vue

@@ -100,8 +100,10 @@ const openImageModal = (url: string) => {
 .image-card img {
   width: 100%;
   height: auto;
+  border-radius: 8px;
   object-fit: contain;
   display: block;
+  overflow: hidden !important;
 }
 
 .preview-image {