[Added, Improved, Fixed] Cancelled accounts can now restart subscriptions on their own

Added

Self-serve subscription reactivation

Cancelled organisations can once again buy a Starter or Scale plan without contacting support.
A new “Start screening again” flow appears on the billing page and home pop-up, guiding lapsed customers through checkout and instantly restoring access after payment.

Improvements

• The billing page now shows a clear "Your plan has ended" message together with the plan picker for cancelled accounts
• Home pop-up opens in a dedicated "reactivation" variant with simpler copy and the saved payment method pre-selected
• Joy no longer offers reactivation to paused or hand-invoiced accounts, preventing accidental double billing
• Trial logic was tightened so returning customers never receive an extra free trial week
• Confirmation button text and footnotes in the checkout modal now match the reactivation use-case

Fixes

• Resolved a bug that returned a 402 error when cancelled organisations tried to purchase a new subscription
• Stopped a scenario where the billing page allowed plan selection but led to a dead end instead of opening checkout
• Corrected status detection so paused accounts are never shown the reactivation offer, avoiding confusing 402 errors
• Fixed copy on the current plan card that incorrectly stated a cancelled plan was “set up by our team”