Workspace Restoration in Message Selector

The message selector (jump to previous message feature) now includes an option to restore the workspace state associated with a previous message when checkpointing is enabled. This allows users to not only jump to a previous conversation point but also restore the file system state from that moment.

When selecting a previous message, users will see indicators showing whether workspace restoration is available for that checkpoint. Messages without restorable workspace states are marked with [ ✗ Restore Workspace ].