fix(ui): billing page feedback

[bodinsamuel]

Changes

• Billing page feeedback
  • Add back button even if not self-serve yet
  • Link point to demo or mail, not pricing page
  • The current plan should not link to anything
  • Upgrade button in environment picker goes to the billing page (and fix auto focus)
  • Missing description for old plans (just put something)

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This PR refines the billing page user experience with several focused improvements. Changes include making the current plan card non-clickable, directing other plans to appropriate contact points, adding explicit buttons for upgrading/downgrading plans, fixing environment picker behavior, and adding descriptions for legacy plans.

Key Changes:
• Modified plan cards to make active plan non-clickable while linking other plans to demo/mail
• Added upgrade/downgrade buttons with appropriate messaging on plan cards
• Fixed environment picker auto-focus behavior for better UX
• Updated 'Upgrade' button to link to billing page instead of external URL
• Added descriptions for older plan types

Affected Areas:
• Billing page UI components
• Plan cards interaction model
• Environment picker component
• Plan definitions

This summary was automatically generated by @propel-code-bot

[cubic-dev-ai]

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