Restricted member emails to light mode only

[peterzimon]

ref https://linear.app/ghost/issue/DES-1169/email-cta-for-signups-lacks-contrast-when-received-in-dark-mode

• The transactional member emails had a problem that whenever the accent color was set to pure black, the contrast on the buttons was low. After experimenting with various solutions, it seems like the most reliable one is to restrict the available modes in Apple Mail to light only.

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Note

Ensures consistent light-mode rendering for member transactional emails to avoid low-contrast CTAs in dark mode.

• Add <meta name="color-scheme" content="light only"> and <meta name="supported-color-schemes" content="light"> to signin.js, signup.js, signup-paid.js, subscribe.js, and update-email.js
• Update e2e snapshots to reflect new meta tags in email HTML

^{Written by Cursor Bugbot for commit 0f58f7d. This will update automatically on new commits. Configure here.}

[coderabbitai]

Walkthrough

This pull request adds color scheme metadata to five email template files within the Ghost member services. Each file receives two identical meta tags in the HTML head section: one declaring color-scheme set to "light only" and another declaring supported-color-schemes set to "light". The changes are purely additive, with no modifications to logic, control flow, or public APIs.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Notes:

• Homogeneous, repetitive change applied uniformly across five email template files
• Only static metadata additions to HTML head; no functional or behavioral modifications
• Consistency check across all five files is straightforward given the identical nature of edits

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title accurately describes the main change: adding color-scheme meta tags to restrict member emails to light mode only across five email templates.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description check	✅ Passed	The PR description clearly relates to the changeset, explaining the problem (low contrast CTAs in dark mode) and the solution (restricting to light mode only by adding meta tags across five email files).

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✨ Finishing touches

• 📝 Generate docstrings

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