ui: improve admin console information architecture

[X-PG13]

Summary

• add a first-screen operator workflow map to the zero-build admin console
• add hero capability pills for zero-build, runtime-aware, publish-ready positioning
• add regression coverage for the workflow overview markup and styles

Validation

• ./.venv-dev/bin/python -m unittest tests.test_web_console -v
• ./.venv-dev/bin/python -m unittest tests.test_docs_links tests.test_release_metadata -v
• node --check src/ainews/web/app.js
• git diff --check
• make check PYTHON=./.venv-dev/bin/python
• Browser desktop check at http://127.0.0.1:8000/

Closes #145