Joakim b5e601d09f feat: implement Phase 3 container transformation with CLASSES.md compliance ...

- Add backend container transformation in engine.go following syntactic sugar specification
- Containers with .insertr get class removed and viable children get .insertr added
- Remove incorrect frontend container expansion - frontend only finds enhanced elements
- Fix StyleAwareEditor hasMultiPropertyElements runtime error
- Add addClass/removeClass methods to ContentEngine for class manipulation
- Update frontend to match HTML-first approach with no runtime container logic
- Test verified: container <section class='insertr'> transforms to individual h1.insertr, p.insertr, button.insertr

This completes the container expansion functionality per CLASSES.md:
Developer convenience (one .insertr enables section editing) + granular control (individual element editing)

2025-09-21 19:17:12 +02:00

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