- Fix high CPU: separate external worktrees from workspace struct, use PNG icons
- Fix high CPU: cache app icons and debounce file watchers
- Show worktree path as primary text, branch name below
- Show worktree path instead of branch under worktree name
- Add dual open buttons to external worktrees
- Show external worktrees not created by EasyTree
- Update appcast.xml for 6e33073