Fix: Normalize leading dot domains in cookie.txt loader so cookies are no longer ignored (#658)

[manikyarathore]

Fixes Issue #658 where cookies with leading dot domains (e.g., .example.com) in cookies.txt were ignored.
The loader stored the domain exactly as provided, but cookie lookup normalizes domains by removing the leading dot. This mismatch caused affected cookies to never match any host.

This PR normalizes the domain during loading:

String domain = tokens[0];
if (domain.startsWith(".")) {
    domain = domain.substring(1);
}
cookie.setDomain(domain);

Result
.example.com → example.com
Cookies load and match correctly.
No other behavior is affected.

[ato]

Thanks!