Switch from backward interpolation (lerp prev→current) to forward
extrapolation (current + (current-prev) * t). The visual now leads
toward the next tile, aligning with the logical hitbox so coins
disappear when Pac-Man visually reaches them.
When blocked (sync-prev! sets prev=current), the offset is zero
and the sprite stays at the current tile.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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