Expose restore to last checkpoint command, add it to accessibility help dialog

[meganrogge]

fixes #291971

[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

@jrieken

Matched files:

• src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingActions.ts

[Copilot]

Pull request overview

This PR exposes the "Restore to Last Checkpoint" command to the command palette and adds it to the accessibility help dialog for better discoverability and accessibility support.

Changes:

• Exposed the "Restore to Last Checkpoint" command to the F1 command palette by setting f1: true
• Added preconditions to ensure the command is only available when appropriate (in chat session, checkpoints enabled, not locked to coding agent)
• Refactored restoreSnapshotWithConfirmation function to extract core logic into restoreSnapshotWithConfirmationByRequestId for better reusability
• Updated RestoreLastCheckpoint action to work with the chat model's checkpoint directly instead of requiring a specific chat item
• Added accessibility alert when no checkpoint is available to restore
• Added the command to the accessibility help dialog's list of helpful commands

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/vs/workbench/contrib/chat/browser/chatEditing/chatEditingActions.ts	Refactored checkpoint restoration logic, exposed RestoreLastCheckpoint command to F1, added preconditions, and improved accessibility with an alert for missing checkpoints
src/vs/workbench/contrib/chat/browser/actions/chatAccessibilityHelp.ts	Added "Restore to Last Checkpoint" command to the list of helpful commands in the accessibility help dialog