Refresh player with native block editor preview and local assets

Preserve shortcode rendering, normalize options, bundle the player locally,
and add reproducible packaging and WordPress integration tests.

playwright.config.js

@@ -0,0 +1,21 @@
+import { defineConfig, devices } from '@playwright/test';
+
+export default defineConfig({
+    testDir: './tests/e2e',
+    fullyParallel: false,
+    workers: 1,
+    forbidOnly: Boolean(process.env.CI),
+    retries: process.env.CI ? 1 : 0,
+    timeout: 90_000,
+    expect: { timeout: 20_000 },
+    reporter: [['list'], ['html', { open: 'never' }]],
+    outputDir: 'test-results',
+    use: {
+        baseURL: process.env.WP_BASE_URL || 'http://localhost:8888',
+        launchOptions: process.env.PLAYWRIGHT_CHROMIUM_EXECUTABLE_PATH ? { executablePath: process.env.PLAYWRIGHT_CHROMIUM_EXECUTABLE_PATH } : {},
+        trace: 'retain-on-failure',
+        screenshot: 'only-on-failure',
+        video: 'retain-on-failure',
+    },
+    projects: [{ name: 'chromium', use: { ...devices['Desktop Chrome'] } }],
+});