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## Summary `ChatWidget` has been carrying several independent domains in one large state bag: transcript bookkeeping, turn lifecycle, queued input, status surfaces, connectors, review mode, and protocol dispatch. That makes otherwise-local changes hard to reason about because unrelated fields and side effects live beside each other in `chatwidget.rs`. This is the first cleanup PR in a larger decomposition effort. It does not try to make `chatwidget.rs` small in one sweep; instead, it establishes focused state boundaries that later handler, popup, rendering, and effect-synchronization extractions can build on. This PR keeps `ChatWidget` as the composition layer while moving focused state into smaller `codex-tui` modules. The widget still owns effects that touch the bottom pane, app events, command submission, redraw scheduling, and terminal-title updates. ## Changes - Add focused state modules under `codex-rs/tui/src/chatwidget/` for input queues, turn lifecycle, transcript bookkeeping, status state, connectors, review mode, and app-server protocol dispatch. - Update `ChatWidget` to hold grouped state structs and route input/lifecycle/status operations through those focused helpers. - Move app-server notification dispatch into `chatwidget/protocol.rs` while leaving feature handlers and side effects on `ChatWidget`. - Replace the large manual `ChatWidget` test literal with the normal constructor plus narrow test overrides, so future state moves do not require every field to be restated in test setup. - Update existing tests to access the new grouped state or narrower helpers without changing snapshot behavior. ## Longer-term direction Follow-up PRs can continue shrinking `chatwidget.rs` by moving behavior, not just state, into focused modules: - Extract input/submission flow, turn/stream handling, and tool-cell lifecycles into domain modules that call the new state reducers. - Move popup/settings builders and rendering helpers out of the main widget file so `ChatWidget` stays focused on composition. - Reduce direct `BottomPane` mutation by applying domain-specific sync outputs at clearer boundaries.