KeyframeThenRefine

Shows the keyframe at once and then refines to the exact frame, which is what a seek bar drag wants: the picture responds immediately and settles a moment later.

The seek machine lands and PRESENTS the keyframe at or before the target first, then runs an ordinary precise landing on the exact frame. The reported position and io.github.yuroyami.kiteplayer.PlayerEvent.SeekCompleted carry the exact landing, never the intermediate keyframe, and a keyframe that already sits on the target skips the second phase. The refine pays its decode-forward from the keyframe a second time; that cost buys the immediate picture, mpv's own trade.