contentWindowInsets

Window insets the content is kept clear of: the system bars by default, so the content lambda's PaddingValues already avoids the status and navigation bars in an edge-to-edge app.

Pass WindowInsets(0, 0, 0, 0) when an ancestor already consumed the insets (e.g. a parent scaffold that owns them), or when the screen draws full-bleed and handles insets on individual controls itself.