feat: 优化分组编辑弹窗滚动并支持新建分组拖拽

src/i18n/locales/en-US.json

@@ -520,6 +520,11 @@
     "groupBoardEdit": "Edit Groups",
     "groupBoardTitle": "Quick Group Editor",
     "groupBoardHint": "Drag students across group columns and save to apply in batch.",
+    "groupBoardNewGroupPlaceholder": "Enter new group name",
+    "groupBoardAddGroup": "New Group",
+    "groupBoardGroupExists": "Group already exists",
+    "groupBoardGroupNameRequired": "Please enter group name",
+    "groupBoardGroupNameInvalid": "Invalid group name",
     "groupBoardEmpty": "Drag students here",
     "groupBoardNoChanges": "No group changes",
     "groupBoardSaveSuccess": "Updated groups for {{count}} students",

src/i18n/locales/zh-CN.json

@@ -520,6 +520,11 @@
     "groupBoardEdit": "编辑分组",
     "groupBoardTitle": "快速编辑分组",
     "groupBoardHint": "拖动学生到不同小组卡片中，点击保存后批量生效。",
+    "groupBoardNewGroupPlaceholder": "输入新分组名称",
+    "groupBoardAddGroup": "新建分组",
+    "groupBoardGroupExists": "该分组已存在",
+    "groupBoardGroupNameRequired": "请输入分组名称",
+    "groupBoardGroupNameInvalid": "分组名称无效",
     "groupBoardEmpty": "可将学生拖拽到这里",
     "groupBoardNoChanges": "分组未发生变化",
     "groupBoardSaveSuccess": "已更新 {{count}} 名学生的小组",