### System details

AMD Ryzen 7 7800X3D, NVIDIA RTX 4070, Omarchy 4.0.0-1, Hyprland 0.56.2

### What's wrong?

The default Steam window rule combines floating the Steam client with inhibiting idle while fullscreen:

```lua
o.window("steam", { float = true, idle_inhibit = "fullscreen" })
```

Source: https://github.com/basecamp/omarchy/blob/9b72edcc94513cba016f145b1ac4ffdaea54b577/default/hypr/apps/steam.lua#L1

Because Hyprland class regexes are full matches, this rule applies to the Steam client class `steam`, but not games launched by Steam, whose XWayland class is normally `steam_app_<appid>`. The `float = true` effect also suggests this rule was primarily intended for the Steam client. Conversely, `idle_inhibit = "fullscreen"` is most useful on the game windows.

For example, while Assetto Corsa was running fullscreen, `hyprctl clients -j` reported:

```json
{
  "class": "steam_app_244210",
  "title": "Assetto Corsa",
  "fullscreen": 2,
  "xwayland": true,
  "inhibitingIdle": false
}
```

After the configured idle timeout, the Omarchy screensaver opened over the game. Controller input does not reliably reset the compositor's idle timer, so the missing inhibitor becomes visible during controller-only play.

The next Steam rule already uses `steam.*` to cover both client and game classes for opacity:

```lua
o.window("steam.*", { tag = "-default-opacity", opacity = "1 1" })
```

#### Steps to reproduce

1. Enable Omarchy idle handling and use a short screensaver timeout.
2. Launch a Steam/Proton game whose class is `steam_app_<appid>`.
3. Run the game fullscreen and use only a controller.
4. Check `hyprctl clients -j`; the game reports `inhibitingIdle: false`.
5. Wait for the idle timeout; the screensaver launches over the game.

#### Expected

Fullscreen Steam game windows should inhibit the Omarchy screensaver and lock timer. The Steam client can retain its existing floating behavior.

One possible approach is to split the concerns:

```lua
o.window("steam", { float = true })
o.window("steam_app_.*", { idle_inhibit = "fullscreen" })
```

Alternatively, the existing `steam.*` match could receive the fullscreen inhibitor if Steam Big Picture should also inhibit idle.

#### Related reports

- #1269 originally reported the screensaver activating during controller gameplay and was closed by #1303.
- #5093 reported the same symptom for other game launchers.
- #6352 attempted to treat gamepad input as activity; the maintainer response preferred marking gaming applications as idle inhibitors.
- #6475 / #6572 concern missing D-Bus inhibitor support in Quattro. This issue is narrower: the explicit Hyprland Steam rule does not match `steam_app_*` windows, and the live client reports `inhibitingIdle: false`.