fix: tolerate unexpected EOF in PNG

[gregberge]

No description provided.

[Copilot]

Pull request overview

This pull request modifies PNG decoding logic to gracefully handle unexpected EOF errors instead of failing. The changes allow processing truncated or corrupted PNG files by treating unexpected EOF conditions as a natural end of data stream.

Changes:

• Modified read_next_rgba_row to return a boolean indicating success and handle EOF gracefully
• Added is_unexpected_eof_decode_error helper function to detect EOF errors
• Converted row processing loops from for loops to while loops that can handle early termination

Reviewed changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/lib.rs	Core PNG processing logic updated to tolerate EOF and handle truncated images
test/index.spec.ts	Added test cases for truncated PNG files
test/fixtures/weird-diff.png	Test fixture: truncated PNG file
test/fixtures/weird-diff-2.png	Test fixture: truncated PNG file

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