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## Why `chatwidget.rs` is still carrying too many unrelated responsibilities in one file. #22269 started a five-phase cleanup to move coherent behavior domains into focused modules while keeping `chatwidget.rs` as the composition layer. #22407 completed phase 2 by extracting input and submission flow, #22433 completed phase 3 by extracting protocol, replay, streaming, and tool lifecycle handling, and #22518 completed phase 4 by extracting settings, popups, and status surfaces. This PR is phase 5. It cleans up the remaining constructor and orchestration code now that the larger behavior domains have moved out, leaving `chatwidget.rs` much closer to the composition layer the cleanup was aiming for. This is once again a mechanical movement of existing functions. No functional changes. ## What Changed - Added focused modules for widget construction and initial wiring, session configuration flow, key/composer interaction routing, review popup orchestration, desktop notification coalescing, and render composition. - Moved the remaining constructor, session setup, interaction, notification, review picker, and rendering helpers out of `codex-rs/tui/src/chatwidget.rs`. - Preserved the existing startup/session behavior, keyboard handling, review picker flow, notification priority behavior, and render composition while shrinking the central widget module substantially. - Left `codex-rs/tui/src/chatwidget.rs` as the registration and composition surface for the extracted behavior modules. ## Cleanup Phases The five-phase cleanup plan from #22269 is: 1. Phase 1: mechanical helper and state moves. Completed in #22269. 2. Phase 2: extract input and submission flow, including queued user messages, shell prompt submission, pending steer restoration, and thread input snapshot/restore behavior. Completed in #22407. 3. Phase 3: extract protocol, replay, streaming, and tool lifecycle handling, while preserving active-cell grouping, transcript invalidation, interrupt deferral, and final-message separator behavior. Completed in #22433. 4. Phase 4: extract settings, popups, and status surfaces, including model/reasoning/collaboration/personality popups, permission prompts, rate-limit UI, and connectors helpers. Completed in #22518. 5. Phase 5: clean up the remaining constructor and orchestration code once the larger behavior domains have moved out, leaving `chatwidget.rs` as the composition layer. This PR. ## Verification - `cargo check -p codex-tui` - `cargo test -p codex-tui chatwidget::tests::popups_and_settings` - `cargo test -p codex-tui chatwidget::tests::plan_mode` - `cargo test -p codex-tui chatwidget::tests::review_mode` - `cargo test -p codex-tui chatwidget::tests::status_and_layout` `cargo test -p codex-tui` also compiles and begins running, but aborts in the unchanged app-side test `app::tests::discard_side_thread_keeps_local_state_when_server_close_fails` with the same reproducible stack overflow noted in phase 4.