**Issue**
Strikethrough on a link doesn't render. The toolbar button highlights
but no line
appears (#15106).
**Solution**
affine-link hardcoded text-decoration: none in the override it passes to
affineTextStyles, which clobbered the decoration computed from
strike/underline.
Removing it fixes the render; plain links still show no underline
because
affineTextStyles returns none by default.
**Result**
Strikethrough and underline render on links again. Added an e2e test: a
plain link
stays undecorated, a struck link renders line-through, red before the
fix and green
after.
fix#15106
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Bug Fixes**
* Fixed link text-decoration styling to properly support strikethrough
and other text formatting when applied to links.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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