fix(site): hide external link arrow when anchor wraps an image

[theletterf]

Summary

• The external-link arrow rendered by a[target='_blank']::after in markdown/typography.css was appearing next to image-only links (e.g., a "Launch Stack" badge or a screenshot that links out). The indicator is redundant there — the image already conveys the target.
• Scope the pseudo-element to anchors that do not contain an <img> via :not(:has(img)).
• Add a short note to docs/syntax/links.md documenting the behavior.

Test plan

• Build the docs site locally and verify an external link with text still shows the arrow.
• Verify an external link wrapping an image (e.g. a markdown [![alt](img.png)](https://external)) no longer renders the arrow.
• Confirm existing overrides in button.css and api-docs.css continue to work.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 335ac507-af68-435c-b59f-76d953054372

📥 Commits

Reviewing files that changed from the base of the PR and between 3139c8a and 337a965.

📒 Files selected for processing (1)

• docs/syntax/links.md

📝 Walkthrough

Walkthrough

Documentation was added to clarify that external links (those with target='_blank') display an arrow indicator next to the link text. A corresponding CSS selector update was made to ensure this indicator is omitted when the link element wraps an image, matching the documented behavior. The change uses the :not(:has(img)) selector to exclude anchors containing images from receiving the arrow indicator.

Suggested labels

fix

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: hiding the external link arrow when an anchor wraps an image.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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 pull request description clearly explains the problem (arrow appearing on image-only links), the solution (using :not(:has(img))), and documents what was changed.

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✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch fix/external-link-arrow-on-image

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[theletterf]

@Mpdreamz Need an approval for this one