feat(14-05): convert tender-radar results-side components to useTranslations

Converts page.tsx, ResultsList, FilterPanel, SavedSearchBar, TenderDetail
and CoverageBanner from hardcoded German strings to
useTranslations('tenderRadar'). FilterPanel's Bundesland/CPV division
option labels are now looked up by stable code (NUTS-1 prefix / CPV
division code) while the underlying filter *value* sent to the backend
stays the canonical German string the API already matches against.
Portal display slugs (DÖE, DTVP, tender24, ...) in TenderDetail's
portalLabel() are left untranslated as proper-noun identifiers, not UI
copy. Updates the four affected component tests with a next-intl
useTranslations mock mirroring the marketplace test convention. Also
fixes an unrelated `t` parameter shadowing the translations function
inside ResultsList's triage batch-fetch (Rule 1).

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

apps/web/src/app/(portal)/modules/tender-radar/page.tsx

@@ -1,6 +1,7 @@
 'use client';
 
 import { Suspense } from 'react';
+import { useTranslations } from 'next-intl';
 import { useRouter, useSearchParams } from 'next/navigation';
 import { CoverageBanner } from './components/CoverageBanner';
 import { FilterPanel } from './components/FilterPanel';
@@ -34,11 +35,11 @@ import { TenderDetail } from './components/TenderDetail';
  * uses, so saving/loading a profile is congruent with the filter state the
  * user currently sees.
  *
- * Intentional hardcoded German strings: full i18n (next-intl message
- * keys) is CONFIG-03, planned for Phase 14 (Research Open Question 3,
- * RESOLVED).
+ * Plan 14-05 (CONFIG-03/UI-06, D-10): all strings render via the
+ * tenderRadar i18n namespace — no more hardcoded German literals.
  */
 function TenderRadarContent() {
+  const t = useTranslations('tenderRadar');
   const router = useRouter();
   const searchParams = useSearchParams();
   const tenderId = searchParams.get('tender');
@@ -53,7 +54,7 @@ function TenderRadarContent() {
     <div className="mx-auto max-w-5xl space-y-6 p-6">
       <div>
         <h1 className="text-2xl font-bold tracking-tight">
-          Ausschreibungs-Radar
+          {t('page.title')}
         </h1>
       </div>
 
@@ -67,15 +68,18 @@ function TenderRadarContent() {
   );
 }
 
+function TenderRadarFallback() {
+  const t = useTranslations('tenderRadar');
+  return (
+    <div className="mx-auto max-w-5xl space-y-6 p-6">
+      <p className="text-sm text-muted-foreground">{t('page.loading')}</p>
+    </div>
+  );
+}
+
 export default function TenderRadarPage() {
   return (
-    <Suspense
-      fallback={
-        <div className="mx-auto max-w-5xl space-y-6 p-6">
-          <p className="text-sm text-muted-foreground">Lädt…</p>
-        </div>
-      }
-    >
+    <Suspense fallback={<TenderRadarFallback />}>
       <TenderRadarContent />
     </Suspense>
   );