fix(gif): guard canvas index overflow#5299
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Reject GIF canvases whose pixel count exceeds the legacy int-indexed canvas boundary and keep canvas copies bounded with size_t checks. Add regression coverage for the oversized-canvas case. Signed-off-by: Dongju Lee <dongpago2@gmail.com>
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This handles malformed GIF files whose logical canvas dimensions can overflow legacy int-indexed canvas calculations.
The patch rejects oversized canvas dimensions before scanline/canvas indexing and adds a regression test for the malformed oversized-canvas case.