Removed unused GhReferralInvite and dashboardStats

[kevinansfield]

closes https://linear.app/ghost/issue/BER-3268/

• the referral invite banner has never displayed correctly due to a typo in the admin/owner permissions check meaning it only worked if MRR stats were loaded outside of the component
• since the old dashboard was replaced with the analytics dashboard in 6.0 the MRR stats haven't been loaded anywhere meaning the banner never displayed
• removed both the banner and the now-unused dashboardStats service

[coderabbitai]

📝 Walkthrough

Walkthrough

Removed the referral invite UI and its supporting dashboard statistics service, plus related tests and styling, eliminating referral banner/toast components, MRR loading logic, and dashboard-stats data layer across the admin codebase.

Changes

Cohort / File(s)	Summary
Referral UI components ghost/admin/app/components/gh-referral-invite.hbs, ghost/admin/app/components/gh-referral-invite.js	Deleted the referral invite component markup and its Ember component implementation (visibility logic, MRR loading, dismiss action).
Nav/footer banner ghost/admin/app/components/gh-nav-menu/footer-banner.hbs, ghost/admin/app/components/gh-nav-menu/footer-banner.js, ghost/admin/app/components/gh-nav-menu/footer.hbs	Removed footer banner component and its invocation in the nav footer; removed banner markup, computed properties, constructor task, and dismiss action.
Dashboard statistics service ghost/admin/app/services/dashboard-stats.js	Deleted entire DashboardStatsService: tracked properties, getters (e.g., currentMRR, memberCounts), all data-loading tasks, reload/fill helper logic, and public load methods.
Service tests ghost/admin/tests/unit/services/dashboard-stats-test.js	Removed unit test suite for dashboard-stats service (existence, aggregation, filtering, attribution tests).
Styles ghost/admin/app/styles/app-dark.css, ghost/admin/app/styles/layouts/main.css	Removed CSS rules related to referral/sidebar banner and referral toast close hover styles.

Poem

🐰 I nibbled code by moonlit beam,

a banner hopped out of the stream.
MRR and toasts tucked into ground,
Quiet sidebar, no more sound.
Hop — the admin path is clean and gleam.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely summarizes the main changes: removal of two unused components (GhReferralInvite and dashboardStats), which matches the changeset content.
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

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch remove-ember-referral-invite

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