[codex] fix running composer steering send

[declancowen]

Summary

Fixes the chat composer send path for running-thread steering/follow-up messages. The send boundary now reads the current Lexical editor snapshot through the composer handle and ChatView uses that fresh prompt directly. Model-only plan helper callers opt out of prompt syncing so cleared draft text is not reintroduced.

Also records the local diff/architecture review for this change in .reviews/chat-composer-steering-review.md.

Root cause

The visible Lexical editor state could be newer than the parent promptRef/draft state used by onSend, so Enter could appear to do nothing until a thread switch forced the composer state to resync.

Validation

• bun fmt
• bun lint (passes with existing warnings)
• bun typecheck
• git diff --check

Notes

Preview In Root/ is unrelated local untracked content and is intentionally not included.

[declancowen]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 🎉

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