Fix image format handling and enhance PageCoverImage component

[conico974]

Make sure to only use a correct DPR for avif/webp component.
PageCover now also use a srcSet

[linear]

RND-7781 Some image are not cached in GBO

[changeset-bot]

⚠️ No Changeset found

Latest commit: 8aa6b78

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[github-actions]

Summary of the deployments:

Version	URL	Status
Vercel	https://gitbook-v2-a4ydziefm-gitbook.vercel.app	✅
Cloudflare	https://061e1f4d-gitbook-open-v2-preview.gitbook.workers.dev	✅

Test content

Site	2v	2c
GitBook	https://gitbook-v2-a4ydziefm-gitbook.vercel.app/url/gitbook.com/docs	https://061e1f4d-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.com/docs
E2E	https://gitbook-v2-a4ydziefm-gitbook.vercel.app/url/gitbook.gitbook.io/test-gitbook-open	https://061e1f4d-gitbook-open-v2-preview.gitbook.workers.dev/url/gitbook.gitbook.io/test-gitbook-open

[argos-ci]

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Build	Status	Details	Updated (UTC)
customers-v2 (Inspect)	👍 Changes approved	42 changed	Aug 5, 2025, 8:28 AM
v2-cloudflare (Inspect)	👍 Changes approved	10 changed	Aug 5, 2025, 9:01 AM
v2-vercel (Inspect)	👍 Changes approved	26 changed	Aug 5, 2025, 8:36 AM

[Copilot]

Pull Request Overview

This PR fixes image format handling for AVIF and WebP formats by implementing proper DPR (Device Pixel Ratio) constraints based on Cloudflare's image transformation limits, and enhances the PageCoverImage component to support responsive images with srcSet.

• Implements DPR calculation logic to respect Cloudflare's format-specific size limits (1600px for AVIF, 1920px for WebP)
• Adds srcSet and sizes attributes to PageCoverImage components for better responsive image loading
• Refactors image size calculation in PageCover to improve efficiency and support srcSet generation

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/gitbook/src/routes/image.ts	Adds format-specific size limits and DPR calculation logic for AVIF/WebP images
packages/gitbook/src/components/PageBody/PageCoverImage.tsx	Adds srcSet and sizes attributes to img elements for responsive loading
packages/gitbook/src/components/PageBody/PageCover.tsx	Refactors image size calculation to support srcSet generation