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Implement closed shadow DOM to prevent external JavaScript from accessing or manipulating postcode lookup form elements. This enhances security by isolating the address search UI from third-party scripts. Changes: - Migrate test suite from Cypress to Playwright with shadow DOM support - Update CI workflows to use Playwright for e2e and snapshot tests - Upgrade Node.js to v24 across all CI workflows - Add shadow DOM test utilities for Playwright BREAKING CHANGE: The postcode lookup widget now uses a closed shadow DOM. External JavaScript can no longer directly access elements like .idpc-input, .idpc-button, or .idpc-select. Custom integrations that relied on direct DOM queries will need to use the extension's configuration options instead.
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…o prevent external JavaScript access