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/dashboard/ChatTable.tsx

@@ -1,4 +1,4 @@
-"use client"
+"use client"
 
 import React, { useState, useEffect, useRef, useCallback } from 'react';
 import { useRouter } from 'next/navigation';
@@ -420,4 +420,4 @@ export default function ChatTable() {
       )}
     </div>
   );
-} 
+}