polish(payments-next): Fix styles in Subscription Management page

[xlisachan]

This pull request

• Adjust border styling
• Subscription information/values alignment to Payment details information/values
• Update divider color in Subscription card

Checklist

Put an x in the boxes that apply

• My commit is GPG signed.
• If applicable, I have modified or added tests which pass locally.
• I have added necessary documentation (if appropriate).
• I have verified that my changes render correctly in RTL (if appropriate).

Screenshots (Optional)