Extract hardcoded colors from AwidgetProvider.kt

[LeanBitLab]

Context
An architectural review identified that there are hardcoded color values inside AwidgetProvider.kt. In Android development, colors should be defined in resource files rather than hardcoded in the logic.

The Goal

1. Locate the hardcoded colors inside app/src/main/java/.../AwidgetProvider.kt.
2. Extract those color values and move them into the standard Android res/values/colors.xml file with appropriate naming conventions.
3. Update AwidgetProvider.kt to reference the new color resources instead of using the hardcoded values.