scan-flow: geolocation scan, location-aware SMS throttle (log sender), finder contact, sms_enabled toggle, branding — 19/19 phase-2 scenarios pass

frontend/internal/sms/sender.go

@@ -0,0 +1,9 @@
+// Package sms provides a swappable SMS sending abstraction for WhereWoof.
+// The log sender is the default so development and tests never send real SMS.
+package sms
+
+// Sender sends an SMS to a destination number in international format
+// (no leading '+', no leading zero — see NormalizeAU).
+type Sender interface {
+	Send(to, body string) error
+}