fix(admin-bulk-actions): plug stale-closure bug in columns useMemo

Header checkbox for 'select all subscriptions' read allVisibleSubscriptionIds,
subscriptionSelection, isMultiTariff, toggleAllSubscriptions from a stale
closure because those values were declared AFTER the columns useMemo. The
warned-about deps were absent, so the header only refreshed by accident
when expandedRows or getFilteredSubs changed.

Relocate filteredUsers / allVisibleSubscriptionIds / toggleAllSubscriptions
above the columns block, list them as deps. Header now reflects current
selection without piggybacking on unrelated re-renders.

Same commit clears the matching AdminInfoPageEditor warning with an
explicit eslint-disable-line comment — the activeLocale omission was
already intentional (initial-content lock), just not silenced.

src/pages/AdminInfoPageEditor.tsx

@@ -981,7 +981,10 @@ export default function AdminInfoPageEditor() {
     const initialContent = pageData.content[activeLocale] ?? pageData.content['ru'] ?? '';
     editor.commands.setContent(initialContent);
     editorPopulated.current = true;
-  }, [pageData, editor]); // activeLocale intentionally omitted
+    // activeLocale intentionally omitted — initial content is locked at editor
+    // mount; subsequent locale changes are routed through switchLocale().
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [pageData, editor]);
 
   // Auto-generate slug from Russian title
   useEffect(() => {