- Refactor code to use idiomatic Kotlin functions like isNullOrEmpty(), associateBy, and appendRange

- Increase `DiffUtil` threshold in `CursorRecyclerAdapter` to 500 and optimize equality checks
- Simplify locale configuration by removing legacy Android SDK version checks
- Remove unnecessary `@SuppressLint` annotations and `@Volatile` modifiers
- Improve performance of collection operations in `ProductFragment` and `Preferences` using `associateBy` and `firstOrNull`
- Suppress deprecation warnings for `getOpacity` in `DrawableWrapper` and `TabsFragment`
- Clean up service binding logic in `Connection.kt` with better type casting

src/main/kotlin/com/michatec/store/screen/TabsFragment.kt

@@ -561,6 +561,7 @@ class TabsFragment: ScreenFragment() {
 
     override fun setAlpha(alpha: Int) = Unit
     override fun setColorFilter(colorFilter: ColorFilter?) = Unit
+    @Deprecated("Deprecated in Java")
     override fun getOpacity(): Int = PixelFormat.TRANSLUCENT
   }