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/admin/AdminAnalytics.tsx

@@ -1,4 +1,4 @@
-"use client";
+"use client";
 
 import React, { useState, useEffect } from "react";
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card";
@@ -739,4 +739,4 @@ export default function AdminAnalytics() {
       </Tabs>
     </div>
   );
-} 
+}