Better documentation for init status bar

ui/src/main/java/com/nextcloud/android/common/ui/util/extensions/AppCompatActivityExtensions.kt

@@ -31,15 +31,42 @@ fun AppCompatActivity.adjustUIForAPILevel35(
     window.addSystemBarPaddings()
 }
 
+/**
+ *
+ * This function provides a unified approach to setting status bar colors across different
+ * Android versions, with special handling for Android 15 (VANILLA_ICE_CREAM) and above
+ * where direct status bar color modification is no longer supported.
+ *
+ * ## Android Version Compatibility:
+ *
+ * ### Android 14 and below (API < 35):
+ * - Uses the traditional `Window.setStatusBarColor()` method
+ *
+ * ### Android 15+ (API 35+):
+ * - **⚠ IMPORTANT**: Direct status bar color modification is NOT possible
+ * - Uses a workaround by applying top padding equal to status bar height
+ * - Sets the view's background color to simulate the desired appearance
+ * - This is a visual approximation, not actual status bar color change
+ *
+ *  * @see [Android Documentation](https://developer.android.com/reference/kotlin/android/view/Window#setstatusbarcolor)
+ *  * @see Window.setStatusBarColor (deprecated in API 35)
+ *
+ * @param color The desired color as a ColorInt.
+ *
+ * @warning On Android 15+, this is a visual workaround only. The actual status bar
+ *          color cannot be modified and will remain transparent with system-managed contrast.
+ */
 fun AppCompatActivity.initStatusBar(
     @ColorInt color: Int
 ) {
     window.decorView.setOnApplyWindowInsetsListener { view, insets ->
-        view.setBackgroundColor(color)
-
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.VANILLA_ICE_CREAM) {
             val statusBarHeight = insets.getInsets(WindowInsets.Type.statusBars()).top
             view.setPadding(0, statusBarHeight, 0, 0)
+            view.setBackgroundColor(color)
+        } else {
+            @Suppress("DEPRECATION")
+            window.statusBarColor = color
         }
 
         insets