fix(ui): hide disabled commands

[disrupted]

when using a custom keymap the user might choose to disable some of the builtin commands. for example I use the brilliant integration with the Snacks files picker https://github.com/sudo-tee/opencode.nvim?tab=readme-ov-file#snacks-picker-integration-with-opencode

therefore I've disabled the ~ files command in my config

{
  keymap = {
    input_window = {
      ["~"] = false,
    },
  },
}

the UI would still show a hint for the disabled command but the mapping does not exist. with this we only show hints for commands that are actually enabled.

[sudo-tee]

Thanks for this fix

Looks good to me