Send reply mail from the post event bus (#16)

Stacks on #15. Handlers only persist and publish; a mail subscriber sends reply email. Unset Resend stays a no-op.

Reviewed-on: #16
Co-authored-by: codegirl-007 <s.raide@gmail.com>

internal/web/posts_test.go

@@ -9,6 +9,7 @@ import (
 	"testing"
 	"time"
 
+	"plumber/internal/events"
 	"plumber/internal/mail"
 	"plumber/internal/pacific"
 	"plumber/internal/store"
@@ -263,8 +264,12 @@ func TestEditPostRoutePermissions(t *testing.T) {
 func TestPostReplyNotifications(t *testing.T) {
 	t.Parallel()
 
+	mem := store.NewMemory()
+	bus := events.New()
+	defer bus.Close()
 	recording := &mail.Recording{}
-	srv, mem := newTestServer(t, Config{Mail: recording})
+	mail.Subscribe(bus, mem, recording)
+	srv := newTestServerStore(t, mem, Config{Events: bus})
 	handler := srv.Handler()
 	homeowner := seedUser(t, mem, uniq("homeowner"), "hunter22", store.RoleUser)
 	admin := seedUser(t, mem, uniq("admin"), "hunter22", store.RoleAdmin)