[FEATURE]: Implement a centralized color theme system for the app to maintain consistent UI styling across all screens and components.

[4555jan]

Feature and its Use Cases

This includes:

defining app color palettes
light and dark theme support

defining app color palettes
light and dark theme support
reusable theme constants

Additional Context

The theme system will be used across widgets, screens, and future UI components to ensure a scalable and consistent design architecture
No response

Code of Conduct

• I have joined the Discord server and will post updates there
• I have searched existing issues to avoid duplicates