- Fix fail-closed bug in safe browsing agent (was returning is_safe=True)

- Non-blocking server IP resolution via background thread

- Fix streaming memory waste with proper iter_content chunking

- Eliminate redundant tldextract.extract calls in similarity agent

- Add connection pooling via requests.Session

- Cache DOM element references in frontend

- Dynamic risk bar color coding based on risk percentage

- Remove unused imports, duplicate stylesheet, and code repetition