Delete image placements before window rerenders

Window layout changes move image overlays before kitty-graphics recalculates terminal positions.  Clearing last-row/last-col first loses the only geometry the backends can use to delete the old terminal placement, which leaves stale pixels over new split separators.

Delete the current recorded image placement during window-change handling before clearing the cached position.  Also make image-mode placement reuse explicit: zoom commands still reuse a PID to avoid flicker, while split/resize rerenders delete first.

0 files changed, 0 insertions, 0 deletions