fix: use signed integers for canvas APIs that accept negative coordinates

[Brooooooklyn]

putImageData, getImageData, and createImageData used u32 for coordinate/dimension
parameters, silently corrupting negative values from JavaScript. The HTML Canvas
spec defines these as signed (long) or using absolute values. Changed to i32 across
the call chain (ctx.rs, sk.rs, page_recorder.rs) so negative values propagate
correctly to the underlying Skia FFI which already accepts signed ints.

• Close Regression: putImageData not drawing image if dx < 0 or dy < 0 since 0.1.89 #1226

Co-Authored-By: Claude Opus 4.6 (1M context) noreply@anthropic.com

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Note

Medium Risk
Changes the JS-facing getImageData/putImageData/createImageData argument types and pixel IO call chain to accept negative values, which can affect rendering output and bounds handling across deferred and direct rendering paths.

Overview
Fixes Canvas ImageData APIs to follow the HTML spec for signed coordinates and negative dimensions instead of silently corrupting negatives via u32 casts.

This updates the Rust/N-API layer and Skia plumbing to use signed i32 for pixel read/write origins (get_image_data/read_pixels/write_pixels and PageRecorder::get_pixels), applies spec behavior for negative getImageData width/height (flip origin + abs size), and makes createImageData treat negative sizes as absolute.

Adds regression tests covering putImageData with negative dx/dy, getImageData with negative x/y and negative width/height, and createImageData with negative dimensions.

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[Brooooooklyn]

• fix: use signed integers for canvas APIs that accept negative coordinates #1227 👈 (View in Graphite)
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