Customize DMS-bar height

### Feature Description

I would like to be able to customize the bar's height to be a specific pixel value.

### Use Case

I am using a macbook with asahi-gentoo and want it to fit perfectly under the notch.

### Compositor(s)

All compositors

### If Other, please specify

_No response_

### Proposed Solution

A setting for the height of the bar

### Alternatives/Existing Solutions

_No response_

Start by locating the DMS bar component and its existing settings entry point in DankMaterialShell. Add a pixel-valued height setting that applies across the listed compositor configurations, then verify that the bar uses the requested height on supported setups.

Written by the indexing model from the issue text.