feat(platform-web): expose ignoreDefaultArgs in browser config (#119)

## Summary
- Adds `ignoreDefaultArgs` to `WebBrowserConfigSchema`, accepting either
`boolean` or `string[]` to match Playwright's
[`LaunchOptions.ignoreDefaultArgs`](https://playwright.dev/docs/api/class-browsertype#browser-type-launch-option-ignore-default-args).
- Forwards the value into `browserType.launch()` in the web runner so
users can disable Playwright's defaults (e.g. drop
`--enable-automation`) or strip individual default args without having
to fork the runner.

## Motivation
Some test setups need to disable specific Playwright defaults (for
example to keep `--enable-automation` off so DRM / EME stacks behave the
same way they do in a real browser, or to opt out of Playwright's
headless-shell args). Without this option the only workaround is to wrap
the platform and re-implement the launch flow.

## Test plan
- [x] `nx run @react-native-harness/platform-web:typecheck` passes
- [ ] Run a web target with `ignoreDefaultArgs: true` and confirm the
browser launches without Playwright's defaults
- [ ] Run a web target with `ignoreDefaultArgs: ['--enable-automation']`
and confirm only that flag is stripped

---------

Co-authored-by: Szymon Chmal <szymon@chmal.it>

Author: nachooya

.nx/version-plans/version-plan-1778726400000.md

@@ -0,0 +1,5 @@
+---
+__default__: patch
+---
+
+Harness on web can now pass Playwright launch arg overrides through the browser config, so you can turn off defaults like `--enable-automation` without forking the runner.

packages/platform-web/src/config.ts

@@ -8,6 +8,7 @@ export const WebBrowserConfigSchema = z.object({
   headless: z.boolean().default(true),
   channel: z.string().optional(),
   executablePath: z.string().optional(),
+  ignoreDefaultArgs: z.union([z.boolean(), z.array(z.string())]).optional(),
 });
 
 export const WebPlatformConfigSchema = z.object({

packages/platform-web/src/runner.ts

@@ -86,6 +86,7 @@ const getWebRunner = async (
       headless: parsedConfig.browser.headless,
       channel: parsedConfig.browser.channel,
       executablePath: parsedConfig.browser.executablePath,
+      ignoreDefaultArgs: parsedConfig.browser.ignoreDefaultArgs,
     });
 
     const context = await browser.newContext();

website/src/docs/getting-started/configuration.mdx

@@ -127,6 +127,8 @@ A test runner defines how tests are executed on a specific platform. React Nativ
 Runner-specific launch options belong inside each runner config via `appLaunchOptions`.
 They are passed whenever Harness launches or relaunches the app for that runner.
 
+For `@react-native-harness/platform-web`, browser launch options such as `ignoreDefaultArgs` belong on the browser config passed to `chromium`, `chrome`, `firefox`, or `webkit`.
+
 For detailed installation and configuration instructions, please refer to the platform-specific guides:
 
 - [**Android**](/docs/platforms/android)

website/src/docs/platforms/web.mdx

@@ -53,6 +53,7 @@ Harness supports all major browser engines through helper factories.
 | `headless`       | `boolean` | `true`  | Whether to run the browser in headless mode.      |
 | `channel`        | `string`  | -       | Browser channel (e.g., `'chrome'`, `'msedge'`).   |
 | `executablePath` | `string`  | -       | Path to a specific browser binary on your system. |
+| `ignoreDefaultArgs` | `boolean` or `string[]` | - | Ignore Playwright's default launch arguments, or remove specific ones. |
 
 ## UI Testing on Web