Theme & Styling Improvement

### Feature Description

Improve Theme / Style / Colors To Add Transparency / Blur & To Match Other DMS Related Settings.

Also Ability To Change This Theme & Stuff From DMS Settings.

### Use Case

Better Match With DMS

### Compositor(s)

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

### Proposed Solution

_No response_

### Alternatives/Existing Solutions

_No response_