fix: handle users being stuck on is_creating billing flow (#12750)

Fixes https://linear.app/chatwoot/issue/CW-5880/handle-customers-being-stuck-on-biling-page

enterprise/app/jobs/enterprise/create_stripe_customer_job.rb

@@ -3,5 +3,22 @@ class Enterprise::CreateStripeCustomerJob < ApplicationJob
 
   def perform(account)
     Enterprise::Billing::CreateStripeCustomerService.new(account: account).perform
+  ensure
+    # Always clear the is_creating_customer flag, even if the job fails
+    # This prevents users from getting stuck on the billing page
+    clear_creating_flag(account)
+  end
+
+  private
+
+  def clear_creating_flag(account)
+    # Atomic JSONB key removal — avoids clobbering concurrent writes to custom_attributes
+    # rubocop:disable Rails/SkipsModelValidations
+    Account.where(id: account.id).update_all(
+      "custom_attributes = custom_attributes - 'is_creating_customer'"
+    )
+    # rubocop:enable Rails/SkipsModelValidations
+  rescue StandardError => e
+    Rails.logger.error("Failed to clear is_creating_customer flag for account=#{account.id}: #{e.full_message}")
   end
 end