Add system ringtones feature to alarm clock

[rakshitjain23]

Feature: System Ringtone Option in Alarm Settings

Added Features

• Added a new "System Ringtones" option in the alarm settings
• Integrated with device system ringtones for wider sound options
• Implemented proper UI styling with clear text contrast and icons
• Fixed visibility issues with popup menu to ensure text is readable

Implementation Details

• Added system ringtone selection dialog
• Connected to device ringtone library
• Ensured proper theming across light and dark modes
• Fixed color contrast for better visibility

Demo

https://github.com/user-attachments/assets/ceb7cbd1-a173-41fb-89ce-fe149494c93c

https://github.com/user-attachments/assets/7282e16f-9f3c-4e6e-83ae-4272edd0ebfd

Checklist

• [x] Tests have been added or updated to cover the changes
• [x] Documentation has been updated to reflect the changes
• [x] Code follows the established coding style guidelines
• [x] All tests are passing

[rakshitjain23]

@MarkisDev Please review now

[rakshitjain23]

@MarkisDev Please tell me if any changes needed?