Card editor help button has no accessible name

[vvallalta-code]

Summary

The Card editor help button has no programmatically determinable accessible name. Screen-reader users encounter an unnamed button and cannot determine its purpose.

Location

• Package: @paperbits/core
• Template: src/card/ko/cardEditor.html
• Related to the incorrect-role issue on the same help-button template.

Expected behavior

The button has a concise accessible name that describes the help it opens, while preserving the existing visual design and tooltip behavior.

Acceptance criteria

• Give the Card help button an accessible name using visible text, aria-label, or aria-labelledby as appropriate.
• Keep native button semantics.
• Confirm the name is announced by a screen reader and available in the accessibility tree.
• Add or update an accessibility regression test where practical.

Tracking: Azure DevOps 26070503