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

Side A fixes a real architectural inconsistency (auth endpoints doing full redirects instead of participating in the poem-JS morph pattern used elsewhere), adding proper success/error fragments and matching CSS for both themes — a genuine, self-contained UX bugfix. Side B is a solid but narrower cleanup that removes a duplicate toolbar/action by SSRing initial state, reducing code but with less functional impact than A's fix.