App Suggestions On Dock

### Feature Description

Add App Suggestion On Dock For Pinning & Opening New app. Similar To Pixel Launcher's Implementaion.

### Use Case

Dock Enhansement.

### Compositor(s)

All compositors

### If Other, please specify

_No response_

### Proposed Solution

Pixel Launcher's Dock

### Alternatives/Existing Solutions

_No response_

The issue does not identify any files, tests, or entry points. Start by locating the existing dock implementation and define the expected suggestion, pinning, and new-app-opening behavior across all compositors before implementation; done should match the agreed Pixel Launcher-like behavior.

Written by the indexing model from the issue text.