Fixes the longstanding FullLaunch (--launch) stealth gap: handle_launch's
fresh-launch path now calls apply_stealth_to_browser, so the 32 JS fingerprint
patches and the HeadlessChrome→Chrome UA strip run on launched browsers (they
never did before — only the launch flags applied).
Verified FullLaunch headless: navigator.webdriver=false,
navigator.userAgent=Chrome/<v> (no HeadlessChrome), new tabs + initial page
clean, bot.sannysoft.com 0 failed / 31 passed.