Function cursor_for_frame 

fn cursor_for_frame(
    track: &[CursorSample],
    cfg: &CursorConfig,
    fps: u32,
    frame: Frame,
    ripple_active: bool,
) -> Option<(f32, f32)>

The pointer position to draw at project frame, applying CursorConfig::hide_static.

Returns None (pointer hidden) only when the cursor is parked and no click ripple is live — a click is an action worth showing even if the cursor hasn’t moved (the Screen Studio rule). Otherwise the smoothed position from cursor_at. Pure, so the hide-while-static decision is unit-testable without a renderer.