Billing flow redirect (#713)

* Billing flow redirect

* fix checkout url

* Refactor checkout and subscription flow

- Improve checkout URL generation with ref unwrapping
- Enhance user data handling in subscription modal
- Remove deprecated CheckoutDetailsModal component
- Update form field and register form styling
- Add more robust user data update mechanism

* Refactor checkout and subscription flow

- Improve checkout URL generation with ref unwrapping
- Enhance user data handling in subscription modal
- Remove deprecated CheckoutDetailsModal component
- Update form field and register form styling
- Add more robust user data update mechanism

* Fix accessibility and checkout URL generation

- Add proper label for terms and conditions checkbox in RegisterForm
- Refactor checkout URL generation in SubscriptionModal using computed refs
- Improve form input handling and reactivity

---------

Co-authored-by: Julien Nahum <julien@nahum.net>

client/components/pages/auth/components/RegisterForm.vue

@@ -69,10 +69,11 @@
       <checkbox-input
         :form="form"
         name="agree_terms"
-        class="mb-3"
+        class="my-3"
         :required="true"
       >
         <template #label>
+          <label for="agree_terms">
           I agree with the
           <NuxtLink
             :to="{ name: 'terms-conditions' }"
@@ -90,6 +91,7 @@
             Privacy policy
           </NuxtLink>
           of the website and I accept them.
+          </label>
         </template>
       </checkbox-input>