feat(ui): add ability to edit user message when reverting

[Githubguy132010]

Fixes #2438

What Changed

Added an edit button to eligible user messages in the chat timeline. Clicking it rolls the thread back to the checkpoint before that message’s agent work, restores the user message text into the composer, and focuses the composer so the prompt can be corrected and resent.

Why

This supports the common “fix my previous prompt and restart from there” workflow without manually copying text and reverting separately. It reuses the existing checkpoint revert mechanism instead of introducing a new rollback path, keeping the behavior consistent with current thread state handling.

UI Changes

Adds a small edit icon button next to the existing revert action on user messages that have a restorable checkpoint.

Before: user messages exposed copy/revert actions only.
After: user messages expose copy/edit/revert actions, with edit pre-filling the composer after rollback.

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

Note

Add Edit button to user messages in the chat timeline to revert and prefill the composer

• Adds an Edit button (alongside the existing Revert button) to eligible user message rows in MessagesTimeline.tsx.
• Clicking Edit reverts the conversation to that message's turn count and prefills the composer with the derived visible text, moves the cursor to the end, and focuses the input.
• The Edit button is disabled while a checkpoint revert or work is in progress.

📊 Macroscope summarized 914e503. 3 files reviewed, 3 issues evaluated, 0 issues filtered, 1 comment posted

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[macroscopeapp]

🟠 High components/ChatView.tsx:3504

onEditUserMessage clears the composer draft and replaces it with the edited message text before onRevertToTurnCountRef.current runs. If the revert bails out (user cancels confirmation dialog, isRevertingCheckpoint already true, environment unavailable, or turn running), the original composer content (prompt, images, terminal contexts) is already destroyed and cannot be recovered.

🤖 Copy this AI Prompt to have your agent fix this:

In file apps/web/src/components/ChatView.tsx around line 3504:

`onEditUserMessage` clears the composer draft and replaces it with the edited message text before `onRevertToTurnCountRef.current` runs. If the revert bails out (user cancels confirmation dialog, `isRevertingCheckpoint` already true, environment unavailable, or turn running), the original composer content (prompt, images, terminal contexts) is already destroyed and cannot be recovered.

Evidence trail:
ChatView.tsx lines 3494-3516: onEditUserMessage clears composer then awaits revert. ChatView.tsx lines 2552-2605: onRevertToTurnCount has multiple early-return bail-out paths (isRevertingCheckpoint, environment unavailable, phase running, user cancels dialog). composerDraftStore.ts lines 2863-2890: clearComposerContent destroys prompt, images, terminalContexts, persistedAttachments.