[Bug]: clientCertificates ignores launch-level proxy and proxy.bypass, routing traffic outside the configured proxy

Version

1.64.0-next (main @ 07f1a6154); code path unchanged since 1.46

Steps to reproduce

When clientCertificates is set, all context traffic is funneled through Playwright's local SOCKS interceptor (socksClientCertificatesInterceptor.ts), which then has to apply the user's proxy settings itself. It gets two cases wrong.

Case A: launch-level proxy is dropped

const browser = await chromium.launch({ proxy: { server: 'http://my-proxy:3128' } });
const context = await browser.newContext({
  clientCertificates: [{ origin: 'https://unrelated.example.com', certPath, keyPath }],
});
const page = await context.newPage();
await page.goto('http://localhost:PORT/empty.html');

Case B: proxy.bypass is ignored

const context = await browser.newContext({
  proxy: { server: 'http://my-proxy:3128', bypass: 'localhost' },
  clientCertificates: [{ origin: 'https://unrelated.example.com', certPath, keyPath }],
});
const page = await context.newPage();
await page.goto('http://localhost:PORT/empty.html');

Repro using the repo's proxyServer fixture (tests/library), with forwardTo(port, { allowConnectRequests: true }) so CONNECT tunnels are recorded:

Case	Proxy received
launch proxy, no clientCertificates (control)	requestUrls=["http://localhost:PORT/empty.html"]
launch proxy + clientCertificates	connectHosts=[] requestUrls=[] (page loaded directly)
context proxy with bypass: 'localhost', no clientCertificates (control)	nothing
same + clientCertificates	connectHosts=["localhost:PORT"]

Expected behavior

Traffic with clientCertificates follows the same proxy rules as without: a launch-level proxy is used when the context has none, and hosts in proxy.bypass are connected to directly.

Actual behavior

• With a launch-level proxy and no context-level proxy, every request goes direct and the proxy never sees it.
• With a context-level proxy that has a bypass list, bypassed hosts are tunneled through the proxy anyway.

Both are silent: no error, just wrong routing.

Additional context

Root cause:

• ClientCertificatesProxy only receives the context options (browser.ts newContext), so this._proxy = contextOptions.proxy never sees browser.options.proxy.
• _getProxyAgent() calls createProxyAgent(this._proxy) without a forUrl, and createProxyAgent only evaluates proxy.bypass when a URL is supplied.

I intend to work on this and will send a PR.

Environment

- Operating System: macOS (Darwin 25.6.0)
- Node.js: 24.8.0
- Browser: Chromium (bundled r1246)
- Playwright: main @ 07f1a6154