fix: skip duplicate photos during import

internal/web/ui.go

@@ -4062,6 +4062,9 @@ func (u *UI) actionFaceGalleryImport(w http.ResponseWriter, r *http.Request) {
 				continue
 			}
 			dst := filepath.Join(personDir, fileName)
+			if _, err := os.Stat(dst); err == nil {
+				continue // skip duplicates
+			}
 			f, err := os.Create(dst)
 			if err != nil {
 				file.Close()