[fix] Use defineConfig in playwright.i18n.config.ts for TypeScript compilation (#5270)

Update playwright.i18n.config.ts to use defineConfig() instead of PlaywrightTestConfig
interface to fix TypeScript compilation issues with 'declare' fields.

The defineConfig API provides proper Vite integration for TypeScript/Babel
compilation, fixing the error: 'TypeScript declare fields must first be
transformed by @babel/plugin-transform-typescript'

Fixes compilation error in i18n collection workflow.

Author: christian-byrne

playwright.i18n.config.ts

@@ -1,6 +1,6 @@
-import { PlaywrightTestConfig } from '@playwright/test'
+import { defineConfig } from '@playwright/test'
 
-const config: PlaywrightTestConfig = {
+export default defineConfig({
   testDir: './scripts',
   use: {
     baseURL: 'http://localhost:5173',
@@ -9,6 +9,4 @@ const config: PlaywrightTestConfig = {
   reporter: 'list',
   timeout: 60000,
   testMatch: /collect-i18n-.*\.ts/
-}
-
-export default config
+})