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fix(transform-template): stop & optimized-appear lifecycle parity (#428)

* fix(transform-template): align stop and optimized-appear lifecycle with upstream

Closes #402. Two transformTemplate lifecycle gaps flagged as follow-up to
#399/#400, verified against motion-dom source.

- controls.stop() now stops the separate templated-transform path. Those
  MotionValue animations aren't in activeAnimationControls and never surface
  in element.getAnimations(), so stop() previously leaked a running templated
  transform (and its style-effect cleanup). Mirror upstream's "stop a
  VisualElement by stopping all its values" by calling
  cleanupTemplatedTransformAnimations() from stopAnimationControlsAnimations().
- Optimized appear no longer paints an untemplated transform. Upstream never
  WAAPI-accelerates transform under a transformTemplate (motion-dom waapi.ts:
  `name !== "transform" || !transformTemplate`). Since our handoff is
  all-or-nothing per element, suppress the SSR appear bootstrap whenever its
  data would include a transform under a template, letting the main-thread
  enter run the templated transform. Opacity-only appears stay accelerated.

Adds regression coverage and two isolated eye-verify demo pages
(/tests/transform-template/stop and /optimized-appear), each with focused
e2e specs proven to fail when the fixes are reverted.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* fix(test): guard optional started array in optimized-appear page

`window.__SvelteMotionAppear?.started.length` only guarded the bootstrap
object, not `started`. Optional-chain `started` too, matching the safer
access already used later in the file. Addresses CodeRabbit review on #428.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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