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: 437e7d9d-8460-4f0b-bad1-368e611a7c1f

📥 Commits

Reviewing files that changed from the base of the PR and between 0bb2ef6 and aa652b4.

⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (3)

• assets/built/screen.css
• assets/css/screen.css
• post.hbs

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Walkthrough

This pull request introduces share button functionality through CSS styling updates and a template modification. The changes add a new .gh-button-share CSS class with base styles and theme-specific overrides for both dark mode and auto-color schemes. The .article-byline flex layout is updated with align-items: center and gap: 16px for improved spacing. Additionally, the sans-serif font stack is expanded with Fira Sans and Droid Sans entries. A share button link is inserted into the post template after the byline section.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Added share button' directly and concisely describes the main change: introducing a new share button feature to the theme.
Description check	✅ Passed	The description is directly related to the changeset, explaining that share button support is being added to official themes in alignment 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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