Inconsistent Color Usage (Not Using Global Theme)

### Description

The project has a centralized theme (theme.dart / AppColors) for managing colors. However, in several view files, colors are still hardcoded directly instead of using the global theme.

This creates inconsistency in UI and makes it harder to maintain or update styles across the app.

### Problem

- Hardcoded colors are used in multiple view files
- Global theme is not consistently followed
- Leads to inconsistent design and harder maintenance

### Expected Fix
- Replace all hardcoded colors (e.g., Colors.black, Color(0xFF...)) with references from the global theme
- Ensure all UI elements (text, backgrounds, buttons, etc.) use AppColors

### Scope
- Identify all instances of hardcoded colors
- Refactor them to use theme.dart
- Maintain consistency across the app