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/ui/date-picker.tsx

@@ -1,4 +1,4 @@
-"use client"
+"use client"
 
 import * as React from "react"
 import { format, addDays, startOfDay, endOfDay, isSameDay, isWithinInterval, getMonth, getYear, setMonth, setYear } from "date-fns"
@@ -410,4 +410,4 @@ export function DateRangeDisplay({ dateRange }: { dateRange?: DateRange }) {
       </span>
     </div>
   )
-} 
+}