Added paywallImprovements feature flag

[kevinansfield]

ref https://linear.app/ghost/issue/BER-3822/add-paywallimprovements-feature-flag

The paywall usability, discoverability & email customization project ships every user-visible slice behind a flag, so the flag needs to exist before the first feature lands — otherwise each subsequent PR has to bundle the flag plumbing with its own behaviour change.

Registers paywallImprovements as a private (developer experiments) feature flag: backend registration in labs.js plus the Labs settings toggle. Private rather than public beta because nothing here is ready to be exposed to users yet.

There is no user-facing behaviour beyond the toggle appearing under developer experiments.

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☁️ Nx Cloud last updated this comment at 2026-07-27 12:54:32 UTC

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: dcfe1b01-2e55-48c0-8eff-9c278cd9c716

📥 Commits

Reviewing files that changed from the base of the PR and between 1a065a5 and 60238d7.

⛔ Files ignored due to path filters (1)

• ghost/core/test/e2e-api/admin/__snapshots__/config.test.js.snap is excluded by !**/*.snap

📒 Files selected for processing (2)

• apps/admin-x-settings/src/components/settings/advanced/labs/private-features.tsx
• ghost/core/core/shared/labs.js

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Walkthrough

Adds the paywallImprovements private labs flag to the shared labs registry and the admin settings private-features list. The flag is consequently included in derived writable and available labs keys, and the “Paywall improvements” entry can be rendered through the existing AlphaFeatures flow when filtering permits it.

Suggested reviewers: 9larsons, erisds

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: adding the paywallImprovements feature flag.
Description check	✅ Passed	The description accurately describes the flag registration and Labs toggle changes in the PR.
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.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.02%. Comparing base (1a065a5) to head (60238d7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #29611      +/-   ##
==========================================
- Coverage   75.03%   75.02%   -0.02%     
==========================================
  Files        1610     1610              
  Lines      141706   141707       +1     
  Branches    17389    17384       -5     
==========================================
- Hits       106334   106309      -25     
- Misses      34310    34336      +26     
  Partials     1062     1062              

Flag	Coverage Δ
e2e-tests	77.12% <100.00%> (-0.03%)	⬇️

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