feat: add support for gif to animated webp and animated webp optimiza…

[Arukuen]

…tion

fixes #76

Summary by CodeRabbit

• New Features

  • Animated GIFs are converted to animated WebP while preserving animation timing and transparency.
  • Animated WebP uploads are optimized and remain animated.
  • Animated images can be resized without flattening their frames.
  • GIFs remain in GIF format when WebP conversion would produce a larger file.

• Documentation

  • Updated conversion guidance to describe animated GIF and WebP handling.
  • Added end-to-end coverage documentation for animated image conversion and transparency preservation.

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Run ID: e686fab5-18f9-46ee-886d-9fde04a0f2fa

📥 Commits

Reviewing files that changed from the base of the PR and between 0165ff4 and 59e5315.

⛔ Files ignored due to path filters (4)

• e2e/fixtures/sample-animated-transparent.gif is excluded by !**/*.gif
• e2e/fixtures/sample-animated.gif is excluded by !**/*.gif
• e2e/fixtures/sample-still.gif is excluded by !**/*.gif
• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (12)

• docs/prd/conversion-engine.md
• e2e/fixtures/sample-animated.webp
• e2e/readme.md
• e2e/test-utils/index.ts
• e2e/test-utils/media.ts
• e2e/tests/animated-webp.spec.ts
• e2e/tests/quality-and-webp.spec.ts
• package.json
• src/shared/converters/animated-image.js
• src/shared/converters/conversion-engine.md
• src/shared/converters/image-converter.js
• webpack.config.js

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🤖 Pull request artifacts

file	commit
pr78-cimo-78-merge.zip	59e5315