feat: Add Playwright testing framework

feat: Add Playwright testing framework This commit introduces the Playwright testing framework to the project. It includes the necessary configuration files, package.json, .gitignore, and example test specs. Key changes include: - Setup of Playwright test runner and configuration (`playwright.config.ts`). - Inclusion of Percy for visual regression testing. - Definitions for different test projects (smoke, core, regression, mobile, Percy). - Basic setup for storage states and headless mode. - Example test cases for demonstration. - Addition of a `.gitignore` file to exclude test artifacts.