fix: replace hardcoded text-white with DS variables, fix label/value layout

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

ui/src/pages/AdminTenantsPage.tsx

@@ -9,6 +9,7 @@ import type { Column } from '@cameleer/design-system';
 import { useAllTenants } from '../api/hooks';
 import { useOrgStore } from '../auth/useOrganization';
 import type { TenantResponse } from '../types/api';
+import styles from '../styles/platform.module.css';
 
 const columns: Column<TenantResponse>[] = [
   { key: 'name', header: 'Name' },
@@ -59,7 +60,7 @@ export function AdminTenantsPage() {
   return (
     <div className="space-y-6 p-6">
       <div className="flex items-center justify-between">
-        <h1 className="text-2xl font-semibold text-white">All Tenants</h1>
+        <h1 className={styles.heading}>All Tenants</h1>
         <Badge label="Platform Admin" color="warning" />
       </div>