feat(web): i18n with react-i18next — Albanian default, English second

Add react-i18next with two key-parity-checked catalogs (sq default/fallback, en).
Active language driven by the logged-in user's stored preference (applied after
/me resolves); SQ/EN toggle in the header persists via PUT /api/auth/language.
Translate the booth (screen, pay/exit modal, active sessions, snapshots, status),
Login, ShiftControl, SiteSettings, PermitManager, TariffComposer.

SetupWizard deferred (its content is server-provided; needs backend catalog i18n).

apps/web/src/ui/SnapshotStrip.tsx

@@ -1,4 +1,5 @@
 import { useState } from "react";
+import { useTranslation } from "react-i18next";
 import { useQuery } from "@tanstack/react-query";
 import { fetchSnapshots, snapshotImageUrl } from "../api.js";
 
@@ -7,6 +8,7 @@ import { fetchSnapshots, snapshotImageUrl } from "../api.js";
 // served with a long immutable cache); clicking one enlarges it. Read-only.
 
 export function SnapshotStrip({ identity }: { identity: string }) {
+  const { t } = useTranslation();
   const { data, isLoading } = useQuery({
     queryKey: ["snapshots", identity],
     queryFn: () => fetchSnapshots(identity),
@@ -16,8 +18,8 @@ export function SnapshotStrip({ identity }: { identity: string }) {
 
   const shots = data?.snapshots ?? [];
 
-  if (isLoading) return <div className="text-[11px] text-term-muted">loading snapshots…</div>;
-  if (shots.length === 0) return <div className="text-[11px] text-term-muted">no snapshots</div>;
+  if (isLoading) return <div className="text-[11px] text-term-muted">{t("pay.loadingSnapshots")}</div>;
+  if (shots.length === 0) return <div className="text-[11px] text-term-muted">{t("pay.noSnapshots")}</div>;
 
   return (
     <>