Fixed blurry images in post feeds

[weylandswart]

Ref https://linear.app/ghost/issue/DES-1376/source-theme-blurry-image, https://linear.app/ghost/issue/DES-1427/tag-pages-image-srcset-issue

Use native sizes="auto" for lazy-loaded post card images so the browser selects a source matching the card's rendered width. Preserve explicit imageSizes values and the existing 320px fallback for eager cards.

[coderabbitai]

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Walkthrough

The post card template now renders responsive image sizing when imageSizes is unset and lazyLoad is enabled. The existing 320px fallback remains for non-lazy-loaded images. The package version changes from 1.7.3 to 1.7.4.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 4c929

The release updates post-card image sizing behavior and bumps the package version to 1.7.4. No merge-blocking risk is currently identified.

Suggested reviewers: minimaluminium

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The description accurately explains the lazy-loaded post card image sizing change, preserved fallbacks, and related issues.
Title check	✅ Passed	The title clearly identifies the main outcome of the change: fixing blurry images in post feeds.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch weyland-des-1376-source-theme-blurry-image

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