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/Services/Comms/EmailService.php

@@ -27,9 +27,11 @@ class EmailService
             $logoUrl = OrganizationBranding::emailLogoUrl($organization);
             $companyName = $organization->name;
         }
+        // Client-facing From display: org/company name, never the Ladill product brand.
+        $displayName = trim((string) ($fromName ?: $companyName)) ?: null;
 
         try {
-            Mail::to($to)->send(new ContactMessageMail($subject, $body, $fromName, $replyTo, $logoUrl, $companyName));
+            Mail::to($to)->send(new ContactMessageMail($subject, $body, $displayName, $replyTo, $logoUrl, $companyName));
 
             return true;
         } catch (\Throwable $e) {