openai/gpt-chat-latest → A (4:1)

Side A replaces a large, unreliable keystroke-driven autocomplete graph with a much simpler paste-and-go flow: it removes the complex parser/action system, introduces a focused URL parser with validation and tests, updates the UI to redirect directly on successful parsing, and eliminates the associated race-prone client logic. Side B mainly refactors routing and theming by introducing canonical `/~/...` browse URLs (`browse_href`, new browse route) and removing theme infrastructure, which is useful cleanup but has less direct impact on core functionality and reliability.