Simplify i18n: remove old react-intl artifacts, rename formatMessage to t, replace FormattedMessage with t.rich().

- Rewrite messages.ts to plain string key maps (remove MessageDescriptor)
- Rewrite useMessages hook to expose t from useTranslations() directly
- Rename formatMessage → t across 193 consumer files
- Replace custom FormattedMessage component with next-intl t.rich()
- Update 52 language files to use rich text tags (<b>, <a>)
- Remove all direct imports from @/components/messages in favor of useMessages()

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/input/WebsiteSelect.tsx

@@ -19,7 +19,7 @@ export function WebsiteSelect({
   teamId?: string;
   includeTeams?: boolean;
 } & SelectProps) {
-  const { formatMessage, messages } = useMessages();
+  const { t, messages } = useMessages();
   const { data: website } = useWebsiteQuery(websiteId);
   const [name, setName] = useState<string>(website?.name);
   const [search, setSearch] = useState('');
@@ -63,7 +63,7 @@ export function WebsiteSelect({
       onOpenChange={handleOpenChange}
       renderValue={renderValue}
       listProps={{
-        renderEmptyState: () => <Empty message={formatMessage(messages.noResultsFound)} />,
+        renderEmptyState: () => <Empty message={t(messages.noResultsFound)} />,
         style: { maxHeight: 'calc(42vh - 65px)', width: 280 },
       }}
       buttonProps={{ style: { minHeight: 40 } }}