Extract hardcoded colors to colors.xml

[LeanBitLab]

Extract hardcoded colors to colors.xml

• Moved hardcoded hex colors and fallback constants from AwidgetProvider.kt to res/values/colors.xml
• Replaced inline color references with context.getColor() in Kotlin code to improve maintainability

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PR created automatically by Jules for task 5550438974200553453 started by @LeanBitLab

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