Fix aspect ratio handling for gravity crops

[TorstenDittmann]

Summary

• calculate non-center gravity resize dimensions from source and target aspect ratios
• preserve image proportions while ensuring the resized image fully covers the crop area
• add pixel-level coverage for every gravity across horizontal and vertical overflow
• add a regression test for aspect-ratio preservation during upscaling

Testing

• ./vendor/bin/phpunit --filter gravity (28 tests, 145 assertions)
• composer lint
• composer check
• composer test reaches 51 tests; 3 existing AVIF/HEIC output tests fail locally because the installed ImageMagick delegates cannot encode HEIC and reject the AVIF lossless parameters

[greptile-apps]

Greptile Summary

This PR fixes a two-part bug in the non-center gravity crop path: it replaces an incorrect raw pixel-dimension comparison ($width > $height) with a correct aspect-ratio comparison ($targetAspect > $originalAspect), and fixes a formula error where resizeHeight was computed as $width * $originalAspect (multiplication) instead of $width / $originalAspect (division). The combined effect was that portrait source images could be scaled too small to cover the crop area, producing out-of-bounds crops.

• src/Image/Image.php: The resize dimensions for non-center gravities are now derived from both the source and target aspect ratios using ceil to guarantee full coverage of the crop rectangle.
• tests/Image/ImageTest.php: Adds a regression test for aspect-ratio preservation during upscaling and an 18-case data-driven test verifying pixel-level gravity positioning for every gravity constant in both horizontal and vertical overflow scenarios.

Confidence Score: 5/5

The change is a targeted, well-reasoned fix to the non-center gravity resize path with comprehensive test coverage; safe to merge.

Both changes in Image.php are mathematically correct: switching from raw pixel comparison to aspect-ratio comparison ensures the right dimension is pinned, and replacing $width * $originalAspect with ceil($width / $originalAspect) fixes the formula that previously under-calculated resizeHeight for portrait sources. The new tests exercise all nine gravity constants across both overflow directions with pixel-level color assertions.

No files require special attention.

Important Files Changed

Filename	Overview
src/Image/Image.php	Fixes non-center gravity crop: replaces raw pixel dimension comparison with aspect-ratio comparison and corrects resizeHeight formula (multiplication to division). Logic is mathematically sound.
tests/Image/ImageTest.php	Adds a regression test for aspect-ratio preservation during upscaling and a data-driven test covering all 18 gravity+orientation combinations with pixel-level color assertions.

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