## Summary

`omarchy toggle bar on` produces the opposite of what the command name says.
Running it hides the menu bar; `omarchy toggle bar off` shows it.

## Steps to reproduce

```bash
omarchy toggle bar on
hyprctl layers | grep omarchy-bar
```

## Actual

The `omarchy-bar` layer is still mapped, but parked above the top edge of the
screen:

```
Layer 59654db57d60: xywh: 0 -26 1920 26, a: 1, namespace: omarchy-bar
                                                          ^^^ negative Y
```

## Expected

`omarchy toggle bar on` should leave the bar visible at `0 0`.

## Cause

`/usr/share/omarchy/bin/omarchy-toggle-bar` forwards its argument unchanged:

```bash
omarchy-toggle bar-off "${1:-toggle}"
```

and `omarchy-toggle` implements `on` as "create the flag file":

```bash
enable() {
  mkdir -p "$(dirname "$FLAG")"
  touch "$FLAG"
}
```

Meanwhile the bar treats the *presence* of that flag as "hidden"
(`/usr/share/omarchy/shell/plugins/bar/Bar.qml:1171`):

```bash
command: ["bash", "-c", "[[ -f $HOME/.local/state/omarchy/toggles/bar-off ]] && echo yes || echo no"]
```

So the flag name already encodes the inverted sense — `bar-off` — and the
generic `on`/`off` actions then apply it the wrong way round:

| Command | `toggles/bar-off` | Bar |
|---|---|---|
| `omarchy toggle bar on` | created | hidden |
| `omarchy toggle bar off` | removed | visible |

## Impact

The documented way to bring the bar back is inverted. A user who runs
`omarchy toggle bar on` to recover a missing bar gets no visible change, and
`omarchy toggle bar` then appears to be a no-op. The desktop looks broken with
no obvious way back except reading `Bar.qml` to find the flag name.

## Notes

`omarchy-toggle` is generic, so it cannot be fixed by swapping `on` and `off`
there — that would invert every other toggle (`idle-lock`, `notifications`,
`crash-capture`, `screensaver`, `nightlight`, `battery-percentage`,
`workspace-layout`, `window-gaps`, `one-window-ratio`). Every other consumer
already treats a present flag as "feature on", so `bar-off` looks like the
odd one out.

Suggested direction, whichever is chosen:

1. Rename the flag to `bar-hidden` and have `omarchy-toggle-bar` map
   `on` -> remove, `off` -> create. Keeps `omarchy-toggle` generic.
2. Or keep `bar-off` and translate inside `omarchy-toggle-bar`.

Option 1 also matches the comment already in `Bar.qml:38`.

Migration concern for option 1: an existing `toggles/bar-off` file would be
ignored, so the bar would pop back into view once on upgrade. Probably fine,
but worth a note.

## Environment

- Omarchy 4.0.4-1
- Host `Legend`