fix: correct dropdown item disabled logic and handle new position assignment

Author: liuruibin

ui/src/views/paragraph/component/ParagraphCard.vue

@@ -93,13 +93,13 @@
                   <template #dropdown>
                     <el-dropdown-menu>
                       <el-dropdown-item
-                        :disabled="props.showMoveUp"
+                        :disabled="!props.showMoveUp"
                         @click.stop="emit('move', 'up')"
                       >
                         {{ $t('views.document.movePosition.moveUp') }}
                       </el-dropdown-item>
                       <el-dropdown-item
-                        :disabled="props.showMoveDown"
+                        :disabled="!props.showMoveDown"
                         @click.stop="emit('move', 'down')"
                       >
                         {{ $t('views.document.movePosition.moveDown') }}

ui/src/views/paragraph/index.vue

@@ -409,8 +409,9 @@ function onEnd(event?: any, params?: any, index?: number) {
   }
   const obj = p ?? {
     paragraph_id: paragraphDetail.value[event.newIndex].id, // 当前拖动的段落ID
-    new_position: paragraphDetail.value[event.newIndex + 1].position, // 新位置的段落位置
+    new_position: paragraphDetail.value[event.newIndex + 1]?.position || paragraphDetail.value.length, // 新位置的段落位置
   }
+  // console.log(paragraphDetail.value[event.newIndex], obj)
   loadSharedApi({ type: 'paragraph', systemType: apiType.value }).putAdjustPosition(
     id,
     documentId,