Fix: hide 'Try again' button when pairing succeeds to prevent state regression

After successful pairing (status === 'paired'), clicking the 'Try again'
button would re-invoke submitHostedPairingRequest, which calls
addSavedEnvironment for an already-connected environment. This throws
'This environment is already connected', causing the UI to regress from
the success state back to an error state.

Hide the button entirely when status is 'paired', leaving only the
'Open app' button visible.

Author: cursoragent

apps/web/src/components/auth/PairingRouteSurface.tsx

@@ -240,13 +240,15 @@ export function HostedPairingRouteSurface() {
         ) : null}
 
         <div className="mt-6 flex flex-wrap gap-2">
-          <Button
-            disabled={status === "pairing"}
-            size="sm"
-            onClick={() => void submitHostedPairingRequest()}
-          >
-            {status === "pairing" ? "Pairing..." : "Try again"}
-          </Button>
+          {status !== "paired" ? (
+            <Button
+              disabled={status === "pairing"}
+              size="sm"
+              onClick={() => void submitHostedPairingRequest()}
+            >
+              {status === "pairing" ? "Pairing..." : "Try again"}
+            </Button>
+          ) : null}
           {status === "paired" ? (
             <Button size="sm" variant="outline" onClick={() => (window.location.href = "/")}>
               Open app