Add option to "tidy up" worktrees 🧹

[v2nic]

Add gray brush icon on the right of the repository name. This should open a modal, list all worktrees that would be deleted. Only clean worktrees, except the main or master branch should be deleted.

Same icon to the right of the worktree row, left of Open, should appear only when worktree is clean, and does not open a modal.

React lucide icon: https://lucide.dev/icons/brush-cleaning

On hover, icon becomes red.

Authored by v2nic on Feb 16, 2026