setContentViewTopPadding

Sets the top padding (in pixels) of the sibling content view that holds overlay views such as the thumbnail grid. After the first call the automatic Java-side adjustments triggered by contextual toolbar lifecycle events are suppressed, so Compose can own this value without racing against native view code.

Typical usage: call from a SideEffect keyed on viewWithOverlappingToolbarShown so the padding stays in sync with the visible toolbar height.