[FEATURE] Add confirmation and undo for Rewind in the desktop Code tab

Preflight Checklist

• [x] I have searched existing requests and this feature hasn't been requested yet
• [x] This is a single feature request (not multiple features)

Problem Statement

In the Claude desktop app (Code tab), the Rewind button sits right next to the Copy button on each message. While browsing an old session, I scrolled to the very first message to copy my original prompt and clicked Rewind by mistake.

The session immediately rewound to its initial state:

• No confirmation dialog appeared.
• There was no way to undo it.
• The whole conversation was effectively gone from the app.

The original transcript (.jsonl under ~/.claude/projects/) was actually still on disk — the app had just switched the session to a new, empty transcript — but there was no way in the app to get back to it. I could only recover it by finding the file manually and running claude --resume <id> in a terminal.

Rewinding to the first message is the most destructive rewind possible, yet it takes a single click, the same as Copy.

Proposed Solution

Show a confirmation dialog before rewinding, e.g. "Rewind to this message? N later messages will be removed.", at least when rewinding past more than a few messages. An optional "Don't ask again" checkbox would keep it lightweight for people who prefer one-click rewind.

Alternative Solutions

• An undo toast ("Undo" for a few seconds) after a rewind, or a way in the app to return to the pre-rewind transcript, since it is still kept on disk.
• More spacing between Copy and Rewind, or moving Rewind into a "…" menu, so the destructive action isn't next to a frequent, harmless one.
• A rewind event in the plugin/mod hooks API, so users can add their own confirmation.

Priority

Medium - Would be very helpful

Feature Category

Other

Use Case Example

1. I open an old session in the desktop app's Code tab.
2. I scroll to the very first message to copy my original prompt.
3. I aim for the Copy button but hit Rewind, which sits right next to it.
4. Today: the session is instantly reset to empty, with no prompt and no undo.
5. With a confirmation dialog, I would just click "Cancel" and lose nothing.

Additional Context

Environment: Claude desktop app, Code tab, Windows 11

Related issues (CLI/TUI, mostly closed): #27387, #64615, #89646