feat: robustness overhaul — LRU cache, better error handling, reduced flickerv0.2.1

- LRU image cache with configurable size and eviction (kitty-gfx-cache-size)
- Cache stores only image IDs; dimensions computed fresh each time
- Leading-edge debounce for faster initial refresh response
- Targeted placement deletion on buffer/window change (no more delete-all flicker)
- Cell pixel size re-queried on window resize
- Image overflow check prevents visual corruption at window bottom
- convert-to-png returns nil on failure instead of passing non-PNG data
- unwind-protect for temp file cleanup in display-image paths
- kill-buffer-hook checks cross-buffer image sharing before deleting
- ignore-errors around all send-string-to-terminal calls
- Millisecond-precision debug logging throughout
- Dead overlay pruning in refresh cycle
- GIF removed from supported formats (multi-frame issues)
- Window-size-change hook in image-mode for split/unsplit re-render

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