Description: The messaging app should support theme color customization based on the active SIM card for sending and receiving messages.

Functional Requirements:

Dual SIM Detection:
Detect and differentiate between two active SIM cards.
Theme Color Customization:
Assign different theme colors to each SIM card.
Display messages with the theme color of the SIM card used.
User Interface:
Provide easy access to theme color settings in the app’s menu.
Allow users to preview theme color changes before applying.