Feature request: Edit previously sent user messages in history

Feature request

Allow editing previously sent user messages in conversation history.

Context

CodexMonitor is a GUI for Codex CLI. During iterative prompting, users often notice typos or want to refine an earlier prompt after seeing the model response.

Problem

Right now, if a user wants to change a previous message, they have to send a new follow-up message instead of correcting the original one. This makes the conversation harder to manage and reduces workflow efficiency.

Proposed behavior

1. Add an Edit action for user-authored messages in history.
2. After editing, provide a clear option like "Regenerate from here".
3. If regeneration is chosen, discard downstream assistant/tool messages after that point and rerun from the edited message.
4. Keep the UX explicit (confirmation/warning) so users understand history will be rewritten.

Why this helps

• Faster prompt iteration.
• Cleaner conversation history.
• Better parity with workflows where users frequently refine prompts.

Thanks for considering this enhancement.