Dock feature request - New additions

### Description of the new feature / enhancement

**Feature Request: Power controls, quick settings, and system tray support in Command Palette Dock**

Hi PowerToys team! Love the new Command Palette Dock — it has a lot of potential as a taskbar companion. I'd love to see the following additions:

**1. Power controls (Power off / Sleep / Restart)**
Currently, pinning "Shutdown computer" from the Command Palette to the Dock shows nothing — no icon, no button. It would be great to have dedicated, visually rendered power control buttons (Shut Down, Sleep, Restart) that work as proper clickable Dock items. Preferably as a single icon, with drop down select

**2. Quick settings widgets (Network, Bluetooth, Volume slider)**
Similar to the Windows 11 Quick Settings panel, it'd be very useful to have toggles/indicators for Wi-Fi and Bluetooth, and an inline volume slider directly in the Dock — without needing to open the full Command Palette.

**3. System tray support**
For users who want to use the Dock as a taskbar replacement or companion, a system tray area (notification icons, background app indicators) would make this much more viable as a primary toolbar.

### Scenario when this would be used?

These three additions would go a long way toward making the Dock a true taskbar alternative. Thanks for the great work!

### Supporting information

_No response_

Start by locating the Command Palette Dock implementation and reviewing how pinned items are rendered and activated. Define the scope for power controls, quick settings widgets, and system tray support, then verify that each requested capability is represented and usable in the Dock.

Written by the indexing model from the issue text.