Add CSV export for orders and update UI symbols

Introduces an exportOrdersToCSV function in lib/api-client.ts to allow exporting orders by status as a CSV file. Updates various UI components to use the '•' (bullet) symbol instead of '·' (middle dot) and replaces some emoji/unicode characters for improved consistency and compatibility. Also normalizes the 'use client' directive to include a BOM in many files.

components/home-navbar.tsx

@@ -1,4 +1,4 @@
-"use client";
+"use client";
 
 import Link from "next/link";
 import { Button } from "@/components/ui/button";
@@ -89,4 +89,4 @@ export function HomeNavbar() {
       )}
     </header>
   );
-} 
+}