- Add form submission handler for linkUserForm
- Validates form input and sends email + relationship to /link_membership_user
- Displays success message and reloads page on successful link
- Shows error messages with proper styling
- Add unlink button click handlers
- Confirms deletion before removing linked account
- Sends link_id to /unlink_membership_user processor
- Reloads page on successful removal
- Integrate CSRF token validation
- Form includes CSRF token generation
- JavaScript captures and includes token in AJAX requests
The membership linking UI is now fully functional. Secondary users can be linked
to primary memberships and removed as needed.
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