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/modals/broadcast-dialog.tsx

@@ -1,4 +1,4 @@
-"use client";
+"use client";
 
 import { useState, useRef } from "react";
 import { Button } from "@/components/ui/button";
@@ -350,4 +350,4 @@ __italic text__
       </DialogContent>
     </Dialog>
   );
-}
+}