Upgrade to XP 8

[rymsha]

Summary

Upgrades lib-thymeleaf build wiring to XP 8 per the xp-app-upgrader skill.

• xpVersion: 8.0.0-SNAPSHOT → 8.0.0-B4 (latest released XP 8 beta on the dev channel — -SNAPSHOT is not a published version).
• Settings plugin added: settings.gradle now applies id 'com.enonic.xp.settings' version '4.0.0-B1'. This is the central XP 8 plumbing that supplies the com.enonic.xp.base plugin version and the xplibs.* dependency catalog.
• Build.gradle reorganized:
  • Replaced the version-pinned alias( libs.plugins.enonic.xp.base ) with the unversioned id 'com.enonic.xp.base' (version is now supplied by the settings plugin).
  • Migrated compileOnly "com.enonic.xp:core-api:${xpVersion}" and portal-api to the xplibs catalog: xplibs.api.core and xplibs.api.portal.
• gradle/libs.versions.toml cleanup: removed the now-redundant enonicXpGradle version and enonic-xp-base plugin alias.

App-only steps in the skill (settings → cms, admin tools/widgets, services/APIs/tasks, webapp, idprovider, application descriptor) were not applicable — this is a JS-exposing Java library with no descriptors.

Validation

• ./gradlew clean build — green (BUILD SUCCESSFUL in 15s, all tests pass).
• Runtime verification was not performed (sandbox runner is ephemeral; out of scope per task brief).

Test plan

• ./gradlew clean build passes locally
• CI green on this branch

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.85%. Comparing base (1b93fd9) to head (b468031).

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #168   +/-   ##
=========================================
  Coverage     78.85%   78.85%           
  Complexity      128      128           
=========================================
  Files            25       25           
  Lines           402      402           
  Branches         25       25           
=========================================
  Hits            317      317           
  Misses           65       65           
  Partials         20       20           

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