Handle Enter on WAYF tooltip toggle

# If applied, this commit will
Make the remember-choice tooltip open when its label is focused and Enter is pressed, and add a Cypress regression test for that keyboard interaction.

# Why is this change needed?
Prior to this change, pressing Enter on the focused WAYF tooltip label did nothing because the Enter handler ignored tooltip labels.

# How does it address the issue?
This change routes tooltip labels through the existing click helper in the WAYF Enter handler so the keyboard interaction follows the same path as a mouse click.

# Provide links to any relevant tickets, articles or other resources
Found during review of PR #2095.

Author: kayjoosten

tests/e2e/cypress/integration/skeune/wayf/wayf.general.spec.js

@@ -230,6 +230,12 @@ context('WAYF behaviour not tied to mouse / keyboard navigation', () => {
       cy.get(rememberChoiceTooltipToggleSelector).should('have.attr', 'aria-expanded', 'true');
     });
 
+    it('Opens the tooltip when the label is focused and Enter is pressed', () => {
+      cy.visit('https://engine.dev.openconext.local/functional-testing/wayf?connectedIdps=5&rememberChoiceFeature=true&rememberChoicePerIdp=true');
+      cy.get('.wayf__rememberChoice label.tooltip').focus().type('{enter}');
+      cy.get(rememberChoiceTooltipValueSelector).should('not.have.attr', 'aria-hidden');
+    });
+
     it('Does not show the tooltip toggle for the global (non per-SP) variant', () => {
       cy.visit('https://engine.dev.openconext.local/functional-testing/wayf?connectedIdps=5&rememberChoiceFeature=true&rememberChoicePerIdp=false');
       cy.get(`.${rememberChoicePerIdpClass}`).should('not.exist');

theme/base/javascripts/wayf/handleEnter.js

@@ -46,6 +46,8 @@ export const handleEnter = (e) => {
         selectFirstIdPAndSubmitForm(); break;
       case defaultIdpClass:
         handleIdpBanner(e); break;
+      case 'tooltip':
+        fireClickEvent(e.target); break;
     }
   });
 };