Fix domain list host matching and invalid-pattern handling

[bartekplus]

Summary

• replace regex-like String.match() domain checks with normalized exact host matching
• ignore invalid domain list entries instead of letting malformed patterns break checks
• add unit coverage for exact matching, normalization, and invalid-entry regression
• add e2e regression for whitelist behavior with an invalid entry plus localhost

Validation

• npm test -- tests/utils.test.ts
• npm run test:e2e -- tests/e2e/puppeteer-extension.test.ts -t "Domain whitelist matches exact host and ignores invalid patterns"