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/promotions/EditPromotionForm.tsx

@@ -1,4 +1,4 @@
-'use client';
+'use client';
 
 import { useState, useEffect } from 'react';
 import { z } from 'zod';
@@ -464,4 +464,4 @@ export default function EditPromotionForm({ promotion, onSuccess, onCancel }: Ed
       </form>
     </Form>
   );
-} 
+}