Channel categories

### Objective:
Integrate a horizontal category list (Pill-style) into the existing mobile app's channel list screen. When a user selects a category, the channel list should update dynamically to display only channels belonging to the selected category.

<img width="614" alt="Image" src="https://github.com/user-attachments/assets/23a97749-54e3-4af8-bf22-58be6d6550a0" />
