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/app/(main)/pixels/PixelsTable.tsx

@@ -11,13 +11,13 @@ export interface PixelsTableProps extends DataTableProps {
 }
 
 export function PixelsTable({ showActions, ...props }: PixelsTableProps) {
-  const { formatMessage, labels } = useMessages();
+  const { t, labels } = useMessages();
   const { renderUrl } = useNavigation();
   const { getSlugUrl } = useSlug('pixel');
 
   return (
     <DataTable {...props}>
-      <DataColumn id="name" label={formatMessage(labels.name)}>
+      <DataColumn id="name" label={t(labels.name)}>
         {({ id, name }: any) => {
           return <Link href={renderUrl(`/pixels/${id}`)}>{name}</Link>;
         }}
@@ -32,7 +32,7 @@ export function PixelsTable({ showActions, ...props }: PixelsTableProps) {
           );
         }}
       </DataColumn>
-      <DataColumn id="created" label={formatMessage(labels.created)}>
+      <DataColumn id="created" label={t(labels.created)}>
         {(row: any) => <DateDistance date={new Date(row.createdAt)} />}
       </DataColumn>
       {showActions && (