[BUG] ClaudeCodeAdd fails on paths with spaces

[7A1T]

Bug Description

ClaudeCodeAdd with default keybinding fails on filepaths that contain spaces

To Reproduce

Steps to reproduce the behavior:

1. Start Claude Code integration with a path containing spaces
2. Run command 'ClaudeCodeAdd %'
3. See error Too many arguments

Expected Behavior

Default command should handle paths with spaces.

Fix:

Update readme:

    {
      "<leader>ab",
      function()
        require("claudecode").send_at_mention(vim.fn.expand("%:p"), nil, nil, "ClaudeCodeAdd")
      end,
      desc = "Add current buffer",
    }