fix: decode commenter names in comments widget

[Pranjal1423]

Closes #496

Description

This PR fixes a visual bug where HTML entities in commenter names (such as ampersands &) were rendered raw inside the Recent Comments widget on the desktop.

Root Causes & Fixes

Missing Entity Decoding in Commenter Name Render:

• Issue: The REST API returns comment author names containing HTML-encoded entities in the author_name payload (e.g. Q&A Guest). The Recent Comments widget set these directly using .textContent, which caused them to render literally on the screen and broke the initials-based avatar bubble generation (grabbing & instead of the correct letter).
• Fix: Updated the loop in src/plugins/recent-comments-widget/index.ts to decode the commenter name using the existing decodeHTML utility from src/utils.ts before setting it to the author element and generating the avatar initial.

Verification

• Build: npm run build completed successfully.
• Typecheck: npm run typecheck completed successfully with zero errors.
• Linter: npm run lint completed successfully with zero errors.
• Unit Tests: npm run test:js completed successfully with all 3789/3789 Vitest tests passing.

Before fix

After fix

[AllTerrainDeveloper]

Thank you!