Added share button

[minimaluminium]

ref https://linear.app/ghost/issue/FEA-613/update-themes-to-include-share-button

We're introducing native share button feature in Portal and this adds share button support to official themes.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 3b43af85-2ffe-4b34-9f5c-d626985f8c83

📥 Commits

Reviewing files that changed from the base of the PR and between aa652b4 and c0cc42f.

⛔ Files ignored due to path filters (1)

• assets/built/screen.css.map is excluded by !**/*.map

📒 Files selected for processing (2)

• assets/built/screen.css
• assets/css/screen.css

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Walkthrough

This pull request adds a new share button to the post template and corresponding styles. It inserts an anchor with class gh-button-share into the post header after the byline. CSS changes introduce the .gh-button-share rules (base appearance, hover state) plus dark-mode and prefers-color-scheme: dark overrides, update .article-byline to include align-items: center and gap: 16px, and expand the --font-sans stack to include Fira Sans and Droid Sans.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Added share button' directly and clearly describes the main change in the pull request, which adds share button support across CSS styling, configuration, and template files.
Description check	✅ Passed	The description is related to the changeset, referencing the feature work (FEA-613) and explaining that the PR adds share button support to official themes to align with Portal's native share button feature.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-share-button

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