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## Why `chatwidget.rs` is still carrying too many unrelated responsibilities in one file. #22269 started a five-phase effort to move coherent behavior domains into focused modules while keeping `chatwidget.rs` as the composition layer. This PR is phase 2 of that plan. It extracts the input and submission flow as a mechanical move before the later protocol, popup/status, and constructor/orchestration phases. ## What Changed - Added `codex-rs/tui/src/chatwidget/input_flow.rs` for composer input results, queued user-message draining, pending-input previews, and mode-specific submission entry points. - Added `codex-rs/tui/src/chatwidget/input_submission.rs` for user-message construction/submission, shell prompt submission, structured mention resolution, and blocked image draft restoration. - Added `codex-rs/tui/src/chatwidget/input_restore.rs` for initial-message submission, pending steer restoration after interrupts, and thread input snapshot/restore behavior. - Registered the new modules and removed the moved `ChatWidget` impl methods from `codex-rs/tui/src/chatwidget.rs`. ## Follow-On Refactor Phases The five-phase plan from #22269 is: - Phase 1: mechanical helper and state moves. Completed in #22269. - Phase 2: extract input and submission flow, including queued user messages, shell prompt submission, pending steer restoration, and thread input snapshot/restore behavior. This PR. - Phase 3: extract protocol, replay, streaming, and tool lifecycle handling, while preserving active-cell grouping, transcript invalidation, interrupt deferral, and final-message separator behavior. - Phase 4: extract settings, popups, and status surfaces, including model/reasoning/collaboration/personality popups, permission prompts, rate-limit UI, and connectors helpers. - 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.