fix(adminfront): resolve biome accessibility and typing lints

adminfront/src/features/user-groups/routes/TenantUserGroupsTab.tsx

@@ -127,8 +127,9 @@ const SidebarNode: React.FC<{
 
   return (
     <div className="flex flex-col">
-      <div
-        className={`flex items-center group px-2 py-1.5 rounded-md cursor-pointer transition-colors ${
+      <button
+        type="button"
+        className={`w-full text-left flex items-center group px-2 py-1.5 rounded-md cursor-pointer transition-colors ${
           isSelected
             ? "bg-primary text-primary-foreground font-semibold"
             : "hover:bg-muted/60 text-muted-foreground hover:text-foreground"
@@ -174,7 +175,7 @@ const SidebarNode: React.FC<{
         >
           {node.recursiveMemberCount}
         </Badge>
-      </div>
+      </button>
 
       {isExpanded && hasChildren && (
         <div className="flex flex-col">
@@ -233,7 +234,7 @@ const MemberTable: React.FC<{
             <TableHead className="text-right">
               {t("ui.admin.users.table.role", "역할")}
             </TableHead>
-            <TableHead className="w-[50px]"></TableHead>
+            <TableHead className="w-[50px]" />
           </TableRow>
         </TableHeader>
         <TableBody>
@@ -307,22 +308,22 @@ function TenantUserGroupsTab() {
     return buildTenantFullTree(allItems, tenantId);
   }, [allTenantsData, tenantId]);
 
-  // Find selected node in the built tree
-  const findNode = (nodes: TenantNode[], id: string): TenantNode | null => {
-    if (!currentBase) return null;
-    if (currentBase.id === id) return currentBase;
-
-    for (const node of nodes) {
-      if (node.id === id) return node;
-      if (node.children.length > 0) {
-        const found = findNode(node.children, id);
-        if (found) return found;
-      }
-    }
-    return null;
-  };
-
   const selectedNode = useMemo(() => {
+    // Find selected node in the built tree
+    const findNode = (nodes: TenantNode[], id: string): TenantNode | null => {
+      if (!currentBase) return null;
+      if (currentBase.id === id) return currentBase;
+
+      for (const node of nodes) {
+        if (node.id === id) return node;
+        if (node.children.length > 0) {
+          const found = findNode(node.children, id);
+          if (found) return found;
+        }
+      }
+      return null;
+    };
+
     if (!currentBase) return null;
     return findNode(currentBase.children, selectedNodeId) || currentBase;
   }, [currentBase, selectedNodeId]);
@@ -707,9 +708,10 @@ const UserAddDialog: React.FC<{
       toast.success(t("msg.info.saved_success", "사용자가 배정되었습니다."));
       onOpenChange(false);
       resetFields();
-    } catch (err: any) {
+    } catch (err) {
+      const error = err as AxiosError<{ error?: string }>;
       toast.error(
-        err.response?.data?.error ||
+        error.response?.data?.error ||
           t("msg.admin.users.detail.update_error", "배정 실패"),
       );
     } finally {