[BUG] ctrl z is undo

Not sure what is the reasoning of making ctrl+z to suspend claude code, its been in everybody muscle memory that ctrl z is for undo

I noticed there are some strange design decision in Claude Code lately, like changing the title of terminal which confuses us who run Claude Code with more than one windows or tabs

Other than that, it's pretty cool that we can restore the session without re-initialize Claude Code, finger crossed the print mode can do that too