-- Phase 6.8: undotree for visual undo history
return {
  'mbbill/undotree',
  cmd = 'UndotreeToggle',  -- Lazy load on command
  keys = {
    { '<leader>u', '<cmd>UndotreeToggle<cr>', desc = 'Undotree: Toggle undo tree' },
  },
  config = function()
    -- Configure undotree
    vim.g.undotree_WindowLayout = 2         -- Layout: diff at bottom
    vim.g.undotree_ShortIndicators = 1      -- Use short time indicators
    vim.g.undotree_SetFocusWhenToggle = 1   -- Focus undotree when toggled
    vim.g.undotree_DiffAutoOpen = 1         -- Auto open diff window
  end,
}