fix(components): preserve pointer events on non-task list markers

[DePasqualeOrg]

This PR was developed with Codex using GPT-6 Astra and went through several rounds of automated review. It resolves a real issue that I encountered while using this library.

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Summary

Bullet and ordered-list markers cancel pointer events despite having no checkbox to toggle. This PR leaves those events available for selection handling while preserving task-checkbox toggling.

How did you test this change?

pnpm test:unit --maxWorkers=2 passes all 474 tests. pnpm build:tsc and pnpm test:lint --threads 2 pass. The new component tests cover propagation, cancellation and both checkbox states; the two non-task cases fail without the fix.

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Latest commit: 3fb3226

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