Add wallet balance widget to the profile menu (after Billing)

Wallet balance peek rendered as a menu row directly under Billing, backed by
a /wallet/balance endpoint (BillingClient) and guarded by Route::has. Also
opens Afia via a direct window event for reliability.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/Support/UserProfileMenu.php

@@ -43,6 +43,11 @@ class UserProfileMenu
             ];
         }
 
+
+        if (Route::has((string) config("billing.wallet_balance_route", "wallet.balance"))) {
+            $items[] = ["type" => "wallet"];
+        }
+
         if (self::userIsAdmin($user)) {
             $adminHref = self::platformUrl('account', 'admin');