fix: UX nits and styles (#7933)

## Summary

- Fix UX nits

## Screenshots


https://github.com/user-attachments/assets/f224a710-5cfd-4aad-a617-20ec56a37370

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-7933-fix-UX-nits-and-styles-2e36d73d365081379a48e1030b7d4340)
by [Unito](https://www.unito.io)

src/locales/en/main.json

@@ -1933,6 +1933,8 @@
       "buyCredits": "Continue to payment",
       "minimumPurchase": "${amount} minimum ({credits} credits)",
       "maximumAmount": "${amount} max.",
+      "minRequired": "{credits} credits minimum",
+      "maxAllowed": "{credits} credits maximum.",
       "creditsPerDollar": "credits per dollar",
       "amountToPayLabel": "Amount to pay in dollars",
       "creditsToReceiveLabel": "Credits to receive",