Feature Request: Volume Control for DMS in Taskbar

### Feature Description

The idea is to have a single place (taskbar, top bar) where I can:
• Adjust system output volume
• Adjust microphone input volume
• Control volumes of multiple running applications individually
• Change audio input/output devices quickly


### Use Case

_No response_

### Compositor(s)

- [x] All compositors
- [ ] Niri
- [ ] Hyprland
- [ ] MangoWC (dwl)
- [ ] Sway
- [ ] Other (specify below)

### Proposed Solution

_No response_

### Alternatives/Existing Solutions

maybe fork noctalia shell

Start by reviewing how DankMaterialShell currently exposes taskbar or top-bar controls and how it accesses audio devices; the issue names no files, tests, or entry points. Define the scope for system, microphone, per-application, and device controls, then verify that the finished feature supports the requested volume and device changes across all listed compositors.

Written by the indexing model from the issue text.