**Changes**
- `frontend/src/components/NormalizedConversation/EditDiffRenderer.tsx:14` drops the global diff-mode store and toggle import so the conversation view no longer renders the inline/split selector bar.
- `frontend/src/components/NormalizedConversation/EditDiffRenderer.tsx:119` locks `DiffView` to `DiffModeEnum.Unified`, guaranteeing inline diffs regardless of other toggles elsewhere.
**Tests**
- `pnpm run frontend:check` (fails: repository missing `node_modules`; `tsc` command unavailable).
**Next Steps**
1. Reinstall frontend dependencies and rerun `pnpm run frontend:check` to verify the TypeScript build.