fix(email): use client/org name as From display, not Ladill product

Customer-facing outbound mail should appear from the business (organizer,
clinic, company, location), not the Ladill product brand.

app/Mail/DigitalReceiptMail.php

@@ -22,9 +22,8 @@ class DigitalReceiptMail extends Mailable
     public function envelope(): Envelope
     {
         $location = $this->sale->location;
-        $fromName = $location?->receipt_header
-            ?: $location?->name
-            ?: (string) config('mail.from.name', 'Ladill POS');
+        // Receipt From is the store/location, never the Ladill POS product brand.
+        $fromName = trim((string) ($location?->receipt_header ?: $location?->name ?: '')) ?: 'Receipt';
 
         return new Envelope(
             from: new Address(