fix(auth): adjust button variant based on sign-in-up step (#9188)

Update the button variant to dynamically switch between 'secondary' and
'primary' based on the current step in the sign-in-up flow. Ensures the
UI reflects the correct state, improving user experience and
consistency.

packages/twenty-front/src/modules/auth/sign-in-up/components/SignInUpGlobalScopeForm.tsx

@@ -126,7 +126,9 @@ export const SignInUpGlobalScopeForm = () => {
                 signInUpStep === SignInUpStep.Password ? 'Sign Up' : 'Continue'
               }
               type="submit"
-              variant="secondary"
+              variant={
+                signInUpStep === SignInUpStep.Init ? 'secondary' : 'primary'
+              }
               Icon={() => (form.formState.isSubmitting ? <Loader /> : null)}
               fullWidth
             />