fix(i18n): localize API error messages by code (no more raw English)

Error toasts surfaced the raw English backend message. Added an errors namespace (fa/ar/en) keyed by error code + a useApiError() resolver that maps ApiClientError.code to the localized message (fallback to a localized generic). Wired into menu, tables, demo banner, and subscription checkout; hardened getErrorMessage so it never returns the raw backend message.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/dashboard/src/components/tables/tables-screen.tsx

@@ -7,6 +7,7 @@ import * as signalR from "@microsoft/signalr";
 import { Plus, QrCode, Pencil, Video, Trash2, Copy, ExternalLink } from "lucide-react";
 import { DemoDataBanner } from "@/components/demo/demo-data-banner";
 import { notify } from "@/lib/notify";
+import { useApiError } from "@/lib/use-api-error";
 import { MediaPairUpload } from "@/components/media/media-pair-upload";
 import { PageHeader } from "@/components/layout/page-header";
 import {
@@ -53,6 +54,7 @@ export function TablesScreen() {
   const branchId = useBranchStore((s) => s.branchId);
   const queryClient = useQueryClient();
   const confirmDialog = useConfirm();
+  const apiError = useApiError();
   const [actionMessage, setActionMessage] = useState<string | null>(null);
   const [showForm, setShowForm] = useState(false);
   const [number, setNumber] = useState("");
@@ -123,7 +125,7 @@ export function TablesScreen() {
       refresh();
     },
     onError: (err) => {
-      const msg = err instanceof ApiClientError ? err.message : t("createError");
+      const msg = apiError(err, t("createError"));
       setActionMessage(msg);
       notify.error(msg);
     },
@@ -142,7 +144,7 @@ export function TablesScreen() {
       refresh();
     },
     onError: (err) => {
-      setActionMessage(err instanceof ApiClientError ? err.message : t("cleaningError"));
+      setActionMessage(apiError(err, t("cleaningError")));
     },
   });
 
@@ -158,7 +160,7 @@ export function TablesScreen() {
         setActionMessage(t("tableHasOpenOrder"));
         return;
       }
-      setActionMessage(err instanceof ApiClientError ? err.message : t("deleteError"));
+      setActionMessage(apiError(err, t("deleteError")));
     },
   });
 
@@ -188,7 +190,7 @@ export function TablesScreen() {
       refresh();
     },
     onError: (err) => {
-      const msg = err instanceof ApiClientError ? err.message : t("createError");
+      const msg = apiError(err, t("createError"));
       setActionMessage(msg);
       notify.error(msg);
     },