🐛 Fixed member name not being trimmed in Portal

[ibalosh]

ref https://linear.app/ghost/issue/ENG-454

what

Added trimming to all three entry points when saving user details: signup, profile update, and custom theme forms.

why

Member names with leading/trailing whitespace were being saved as-is, causing single-letter avatars and data quality issues.

[coderabbitai]

Walkthrough

Trims whitespace from name inputs in portal signup and profile update flows. apps/portal/src/actions.js now trims the signup name before constructing payloads (including when plan is 'free') and trims incoming member data before comparing/updating. apps/portal/src/data-attributes.js extracts the name input, trims it, and returns undefined for empty results. Tests in apps/portal/test/* were added/updated to assert trimmed names are sent to sendMagicLink and API update calls. apps/portal/package.json version bumped from 2.56.3 to 2.56.4.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: fixing member name trimming in Portal. It accurately reflects the core purpose of the changeset.
Description check	✅ Passed	The description directly relates to the changeset, explaining what was changed (trimming added to three entry points) and why it matters (preventing whitespace-related issues).

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