Add worktree browser (gwt) and worktree delete selector (gwd) with:
- Interactive worktree list with lock status, branch info, and age
- Preview showing working tree status and recent commits
- Ctrl-Y to copy worktree path, Alt-L to toggle lock/unlock
- Shell integration for zsh (with cd) and fish (with cd)
- Tab completions for zsh, bash, and fish
- Documentation in README with keybindings and options
Co-Authored-By: Sufien Tout <sufientout@gmail.com>
- Add _forgit_strip_ansi for removing ANSI escape codes
- Add _forgit_branch_list to list branches with current branch first
- Add _forgit_extract_branch_name to parse branch names from git output
- Update checkout_branch, switch_branch, branch_delete, cherry_pick_from_branch,
and branch_preview to use the new helpers
- Fix _forgit_inside_work_tree to suppress stderr
