admin: photo preview fixed size (inline styles); preview mode ?preview=1 (banner, no scan functionality) with Preview buttons in admin row action + owner edit link

frontend/internal/handlers/tag_page.go

@@ -12,6 +12,7 @@ import (
 
 type publicData struct {
 	UpdatedAt   pgtype.Timestamptz
+	Preview     bool
 	ID          int64
 	TagCode     string
 	Status      string
@@ -48,6 +49,7 @@ func (a *App) PublicTag(w http.ResponseWriter, r *http.Request) {
 	}
 
 	pd := publicData{
+		Preview:     r.URL.Query().Get("preview") == "1",
 		UpdatedAt:   tag.UpdatedAt,
 		ID:          tag.ID,
 		TagCode:     tag.TagCode,