Added gift subscription URL to editor link autocomplete

[minimaluminium]

ref https://linear.app/ghost/issue/BER-3489/ghost-admin-add-gifting-url-to-the-button-card-in-the-editor
ref https://linear.app/ghost/issue/BER-3488/ghost-admin-add-gifting-url-to-the-cta-card-in-the-editor

• lets publishers promote the new gift subscription flow from posts and emails via Button or CTA cards
• adds #/portal/gift to the link autocomplete alongside the other portal links
• picked up automatically by all cards using the shared InputUrlSetting (Button, CTA, Email CTA, Header, Product)
• gated behind the giftSubscriptions lab flag

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 1c5fb5d7-0f6a-4c87-abe4-288d7666ab4c

📥 Commits

Reviewing files that changed from the base of the PR and between 9505bac and 5c2fa36.

📒 Files selected for processing (2)

• ghost/admin/app/components/koenig-lexical-editor.js
• ghost/admin/app/services/feature.js

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Walkthrough

This change introduces gift subscription link support to the editor's autocomplete functionality. A new giftSubscriptions feature flag was added to FeatureService via the @feature decorator. The koenig-lexical-editor component was updated with a giftLink helper that conditionally returns a "Gift subscription" autocomplete option (linking to #/portal/gift) when the feature flag is enabled. The helper is integrated into the autocomplete links assembly between recommendation and offer links, while maintaining existing member, donation, and other link logic unchanged.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: adding a gift subscription URL to the editor's link autocomplete feature.
Description check	✅ Passed	The description is directly related to the changeset, explaining the purpose, implementation approach, and feature gating of the gift subscription URL addition.
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 docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch gift-link-editor-ber-3489

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud