jinja_bridge.py was creating Component objects for both defcomp AND
defisland forms. Islands need Island objects so the serializer emits
defisland (not defcomp) in the client component bundle. Without this,
client-side islands don't get data-sx-island attributes, hydration
fails, and all reactive signals (colour cycling, stepper) stop working.
Add Playwright test: islands hydrate, stepper buttons update count,
reactive colour cycling works on click.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
giles
e887c0d978