Pull Request

📖 Description

• Clears the FAST Element event execution context in a finally path when event handler evaluation throws.
• Preserves existing preventDefault() behavior for completed handlers that do not return true.
• Adds targeted Playwright coverage and updates event binding documentation/design notes.

📑 Test Plan

• npx playwright test --project=chromium -g "clears the current event"
• npm run build -w @microsoft/fast-element
• npx biome check packages\fast-element\src\templating\html-binding-directive.ts packages\fast-element\src\templating\html-binding-directive.pw.spec.ts packages\fast-element\DESIGN.md packages\fast-element\docs\template-bindings.md packages\fast-element\SIZES.md change\@microsoft-fast-element-809c6e19-e1e8-49f4-ad14-bdd77f4d76dd.json
• npm run checkchange

✅ Checklist

General

• I have included a change request file using $ npm run change
• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.