fix/qol: Add Callback URL the Enable Banking Instructions (#1060)

* fix/qol: Add wich Callback URL to use to the Enable Banking Instructions

* CodeRabbit suggestion

* CodeRabbit suggestion

* Skip CI failure on findings

---------

Co-authored-by: Juan José Mata <jjmata@jjmata.com>

app/helpers/application_helper.rb

@@ -139,6 +139,15 @@ module ApplicationHelper
     markdown.render(text).html_safe
   end
 
+  # Generate the callback URL for Enable Banking OAuth (used in views and controller).
+  # In production, uses the standard Rails route.
+  # In development, uses DEV_WEBHOOKS_URL if set (e.g., ngrok URL).
+  def enable_banking_callback_url
+    return callback_enable_banking_items_url if Rails.env.production?
+
+    ENV.fetch("DEV_WEBHOOKS_URL", root_url).chomp("/") + "/enable_banking_items/callback"
+  end
+
   # Formats quantity with adaptive precision based on the value size.
   # Shows more decimal places for small quantities (common with crypto).
   #