V2 Payment Features (#4974)

* Added ability to add seats to enterprise
* first logged in date on people page
* Remove Premium config section				
* Cleanup add seat flow					
* Shrink numbers in plan 					
* Make editing text a server feature in the highlights
* default to dollar pricing				
* clear checkout logic when crash				
* Recongnise location and find pricing			
* Payment successful page

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Co-authored-by: Connor Yoh <[email protected]>

frontend/src/proprietary/components/shared/UpgradeBanner.tsx

@@ -75,7 +75,7 @@ const UpgradeBanner: React.FC = () => {
   // Handle upgrade button click
   const handleUpgrade = () => {
     openCheckout('server', {
-      currency: 'gbp',
+      // Currency auto-detected from locale in CheckoutContext
       minimumSeats: 1,
       onSuccess: () => {
         // Banner will auto-hide on next render when license is detected