fix: #3589117 Reattach modeler behaviors after HTMX loading

Jürgen Haasrequested to merge
issue/modeler-3589117:3589117-issue-branch into 1.0.x

Closes #3589117 (closed)

AI-Generated: Yes (Used OpenCode to diagnose the HTMX promise race, implement the compatibility fix, and add regression coverage.)

Summary

  • repeat Drupal behavior attachment when the modeler bundle loads after the HTMX attachment pass
  • initialize behaviors supplied by libraries that extend the modeler
  • add regression coverage for late-loaded dependency behaviors

Testing

  • npm run lint
  • npm run type-check
  • npm test -- --runInBand (126 suites, 3,585 tests)
  • npm run build:production

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