openai/gpt-chat-latest → A (5:1)

Side A fixes a concrete security vulnerability by introducing Ammonia-based sanitization for untrusted Reddit `body_html` before `maud::PreEscaped` rendering, adds a reusable `entity_body_html` helper, and includes tests verifying scripts and event handlers are stripped while benign markup is preserved. Side B is primarily a large refactor that consolidates `/post*` flows into `/ui`, moves code, and changes routing and form submission patterns, but it mostly reorganizes existing behavior rather than adding comparable enduring functionality.