fix(stealth): solve Cloudflare challenges regardless of locale + retry cap + fix crashing mid-solve

The solver matched English challenge strings, so any non-default locale left the challenge unsolved.
The real cause was Playwright's context locale option patching the main thread only, while Web Workers kept the browser language, a mismatch Cloudflare rejects. Locale is now applied via browser launch flags, so the page, workers, and the Accept-Language header stay consistent, and the solver checks the language-free challenge markers with a retry cap.

Also catch patchright errors in the page-content retry so stealth pages stop crashing mid-solve.

Co-Authored-By: Parash Subedi <parash.subedi@grepsr.com>