feat: #3630123 Show users their own account details on their profile page

Issue: https://www.drupal.org/project/varbase_users_base/issues/3630123

• Adds the varbase_user_profile_details ECA model: a "Profile details" extra field on the user display (account owner only, varies by user) and a "User profile details" ECA block that Drupal Canvas offers as a block component.
• Both render the active theme's user-profile-details SDC with Drupal's default user fields, a full name when the site has one, and Edit profile / Change password / Log out actions.
• The recipe installs eca, eca_base, eca_render, eca_user and modeler_api, and requires drupal/eca and drupal/modeler_api.

Pairs with the Vartheme BS5 5.0.x component: https://www.drupal.org/project/vartheme_bs5/issues/3630124

How to test

1. Install Varbase 11.0.x with this branch and the Vartheme BS5 branch.
2. Log in as a user with no extra role and visit /user: the Profile details card shows.
3. As an administrator, view that user's profile: no card.

Tested on a fresh Varbase 11.0.x DDEV install (Drupal 11.4.9) and by applying the recipe to an existing site.

AI-Generated: Yes. Developed with Claude Code assistance, human review pending.

Checkpoints:

• File an issue
• Addition/Change/Update/Fix
• Testing to ensure no regression
• Automated unit testing coverage
• Automated functional testing coverage
• UX/UI designer responsibilities
• Readability
• Accessibility
• Performance
• Security
• Developer Documentation
• User Guide Documentation
• Reviewed by human
• Code review by maintainers
• Full testing and approval
• Credit contributors
• Review with the product owner
• Release notes snippet
• Release

🤖 Generated with Claude Code