Reorganize Folder Structure

## Note - Planning needed before implementation

### Reason

**The current project structure is inconsistent and loosely organized, which creates several challenges:**

- Difficult navigation: Developers often rely on search to locate related components.
- Related classes (UI, models, services, utils) are scattered across different packages.
- New contributors struggle to understand where to place or find code.
- As features grow, the structure becomes harder to maintain and extend.

### Suggested structure

Instead of grouping code by type (e.g., all models, all utils), we can organize the project by feature.

**Each feature will contain its own:**

- UI components
- Models
- Services
- Utilities