Add default new-thread worktree mode with draft defaults#1007

notkainoa wants to merge 2 commits intopingdotgg:mainpingdotgg/t3code:mainfrom

notkainoa:t3code/rework-new-worktree-thread-flownotkainoa/t3code:t3code/rework-new-worktree-thread-flowCopy head branch name to clipboard