pierce shadow dom in cypress tests using the includeshadowdom configuration option

Steps

1. add includeShadowDom: true at the top level of the object passed to defineConfig() in cypress.config.js to enable it globally
2. use standard cy.get() or cy.find() commands afterward; Cypress will automatically traverse open shadow roots to locate matching elements
3. alternatively pass { includeShadowDom: true } as an options argument to an individual command when only specific tests need shadow-piercing behavior
4. use the dedicated .shadow() command on a known shadow host element as an alternative when only that subtree needs to be pierced, without the global config flag
5. verify selectors resolve correctly against components using open shadow roots, since closed shadow roots remain inaccessible regardless of this setting