Add keybind for renaming/moving worktrees

### Is your feature request related to a problem? Please describe.
The worktrees panel supports creating, switching, and removing worktrees, but there's no current implementation to move/rename one. I always had to drop to the shell to rename my worktree using `git worktree move`. After a short time I created a customCommand for it.

### Describe the solution you'd like
A keybinding in the worktrees panel (e.g. r, mirroring branch rename R) that prompts for a new path, pre-filled with the current one, and runs git worktree move (or other command if there is a better one for this job).

### Describe alternatives you've considered
I am currently using custom command scoped to the worktrees context:

customCommands:
- key: "r"
description: "Move/rename worktree"
context: "worktrees"
prompts:
- type: "input"
key: "Path"
title: "New worktree path:"
initialValue: "{{ .SelectedWorktree.Path }}"
command: "git worktree move {{ .SelectedWorktree.Path | quote }} {{ .Form.Path | quote }}"

but it feels like it belongs built-in alongside create/remove.

### Additional context
---

Start by inspecting the worktrees panel and its existing create, switch, and remove actions, then compare them with the provided custom command. Implement the requested keybinding so it prompts for a new path pre-filled with the selected worktree path and runs git worktree move. Done means the worktree can be renamed or moved from the panel without a shell command.

Written by the indexing model from the issue text.