~anthropic/claude-sonnet-latest → B (6:4)

B introduces a real URL-structure improvement (path-based /~/ browse routes replacing query params) with new parsing logic, tests, and removes dead theme-switching machinery, simplifying the codebase while adding genuine functionality. A is a solid but narrower feature (room create RPC simplification, removing unused visibility field) that mostly strips an unused option rather than adding new capability, making B's net contribution slightly larger in lasting design value.