fix(next.config): correct comment formatting for BACKEND_API_BASE_URL warning

- Updated comment in next.config.mjs to improve clarity regarding the implications of setting BACKEND_API_BASE_URL in the environment file.
- Added "use client" directive in tableSortContext.ts to indicate client-side rendering for the context component.

src/components/ui/tableSortContext.ts

@@ -1,3 +1,5 @@
+"use client";
+
 import { createContext } from "react";
 
 export type SortDirection = "asc" | "desc";