fix(billing): resolve react query cache conflict rendering undefined values, update enterprise CTA label and show plan cards for all tiers

memento-note/locales/en.json

@@ -2860,7 +2860,7 @@
     "businessFeature4": "1,000 chat messages / month",
     "enterpriseTitle": "Enterprise",
     "enterpriseDescription": "Custom quotas, SSO, priority support.",
-    "contactSales": "Contact Sales",
+    "contactSales": "Contact us",
     "startCheckout": "Get Started",
     "checkoutLoading": "Loading checkout…",
     "checkoutSuccess": "Subscription activated! Welcome to {tier}.",

memento-note/locales/fr.json

@@ -2864,7 +2864,7 @@
     "businessFeature4": "1 000 messages de chat / mois",
     "enterpriseTitle": "Entreprise",
     "enterpriseDescription": "Quotas personnalisés, SSO, support prioritaire.",
-    "contactSales": "Contacter les ventes",
+    "contactSales": "Contactez-nous",
     "startCheckout": "Commencer",
     "checkoutLoading": "Chargement du paiement…",
     "checkoutSuccess": "Abonnement activé ! Bienvenue dans {tier}.",