i18n: translate all public page bodies (EN + IT)

Internationalised the ~44 public pages with next-intl (the shell was
already translated). Each page now pulls its copy from a "pages.<slug>"
namespace via getTranslations (server) / useTranslations (client); the
EN + IT catalogs were authored by parallel agents and merged centrally,
with natural Italian (ICU plurals) and it backfilled from en for any
gap. request.ts gained getMessageFallback/onError so a missing key
degrades to the English value, never a raw key.

Behaviour unchanged (only display text moved to t() calls; queries,
actions, fields, ContentCard structure preserved). Verified on the prod
server: with NEXT_LOCALE=it, home/community/staff/news/shop/rankings all
render Italian copy, no raw-key leakage; English unchanged. The nav
language switcher toggles EN/IT live. tsc 0, vitest 49/49, next build 0.

Admin pages intentionally left in English (staff tooling).

src/app/rankings/page.tsx

@@ -1,3 +1,4 @@
+import { getTranslations } from "next-intl/server";
 import Link from "next/link";
 import { ContentCard, EmptyState, OnlineBadge, RankBadge } from "@/components/public/ui";
 import { avatarImageUrl } from "@/lib/format";
@@ -17,6 +18,7 @@ type TopUser = {
 };
 
 export default async function RankingsPage() {
+  const t = await getTranslations("pages.rankings");
   let users: TopUser[] = [];
   try {
     users = await prisma.user.findMany({
@@ -35,11 +37,11 @@ export default async function RankingsPage() {
 
   return (
     <main style={{ display: "grid", gap: "1.5rem" }}>
-      <ContentCard icon="🏆" title="Rankings" subtitle="The top 12 players ranked by credits" />
+      <ContentCard icon="🏆" title={t("title")} subtitle={t("subtitle")} />
 
       <ContentCard padded={users.length === 0}>
         {users.length === 0 ? (
-          <EmptyState icon="🏆">No players to rank yet.</EmptyState>
+          <EmptyState icon="🏆">{t("emptyState")}</EmptyState>
         ) : (
           <div className="card-grid sm-2 lg-3" style={{ padding: "1rem" }}>
             {users.map((u, i) => {