## Why
Retrying a safety-buffered turn by rolling back the active thread rewrites the
source conversation and requires the TUI to repair its local transcript state.
## What changed
- Interrupt the buffered turn, then fork after the preceding completed turn and
submit the prompt on the new thread with the faster model and low reasoning
effort.
- Start a new thread when the buffered request is the conversation's first turn.
- Preserve committed steering input in the retry, leave the source thread
intact, and restore the prompt alongside any existing draft if branching
fails.
- Do not offer the retry action for side conversations or stale and in-progress
turns.
## Testing
Added coverage for retries with prior context, first-turn retries, committed
steering input, branch failures, existing composer drafts and attachments, and
side conversations.
GitOrigin-RevId: adb49da8236e9212ef0082e033e6f715986b5cd9
## 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.
Felipe Coury