Sicherung: Kartenzeilen und Loeschen mit Bestaetigung

src/lib/api-client.ts

@@ -198,6 +198,12 @@ export function runBackupNow(): Promise<{ backup: BackupInfo }> {
   return request<{ backup: BackupInfo }>("/api/backups", { method: "POST" });
 }
 
+export function deleteBackup(name: string): Promise<{ deleted: boolean }> {
+  return request(`/api/backups/${encodeURIComponent(name)}`, {
+    method: "DELETE",
+  });
+}
+
 export function createOvertimeAdjustment(input: {
   entryDate: string;
   minutes: number;