fix(manage): HandleReorder gibt 400 bei Mismatch zurück, slog für 500-Fehler

server/backend/internal/httpapi/manage/playlist.go

@@ -2,7 +2,9 @@ package manage
 
 import (
 	"encoding/json"
+	"errors"
 	"fmt"
+	"log/slog"
 	"net/http"
 	"strconv"
 	"strings"
@@ -242,7 +244,12 @@ func HandleReorder(playlists *store.PlaylistStore, notifier *mqttnotifier.Notifi
 		}
 
 		if err := playlists.Reorder(r.Context(), playlistID, ids); err != nil {
-			http.Error(w, "db error", http.StatusInternalServerError)
+			if errors.Is(err, store.ErrReorderMismatch) {
+				http.Error(w, "item list mismatch", http.StatusBadRequest)
+			} else {
+				slog.Error("reorder failed", "err", err)
+				http.Error(w, "db error", http.StatusInternalServerError)
+			}
 			return
 		}
 

server/backend/internal/httpapi/manage/ui.go

@@ -745,6 +745,7 @@ func HandleReorderUI(playlists *store.PlaylistStore, screens *store.ScreenStore,
 			if errors.Is(err, store.ErrReorderMismatch) {
 				http.Error(w, "item list mismatch", http.StatusBadRequest)
 			} else {
+				slog.Error("reorder failed", "err", err)
 				http.Error(w, "db error", http.StatusInternalServerError)
 			}
 			return