Alan Guo Xiang Tan 9e2a10b427

DEV: Add image-processing regression coverage (#42117) ...

Previously, important image-processing behavior lacked precise
regression coverage, making image-library upgrades difficult to assess
safely.

This change adds coverage without changing production behavior:

- Exercises public upload and image-model outcomes for SVG sanitization,
format detection and conversion, transparency, animation metadata, EXIF
orientation normalization, malformed input rejection, crop positioning,
tiny-image resizing, dominant-color caching, and image-quality
selection.
- Keeps normal LetterAvatar RSpec coverage portable by generating one
representative PNG and checking its format and requested dimensions.
- Adds a separate Linux-only `script/letter_avatar_pixel_diff` workflow
that compares A–Z renders with committed baselines and generates an HTML
expected/actual/highlighted-diff report. Use `--update-baselines` when
intentionally accepting rendering changes.
- Uses deterministic fixtures with regeneration guidance beside the
relevant specs.

2026-07-30 15:28:07 +08:00

91 B

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2x1px

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