Add help text descriptions for social media fields in public profile

[marcoacierno]

This PR adds help text descriptions to all social media fields in the public profile section, explaining the accepted format for each field.

Changes

• Added help_text to social media fields in backend/participants/models.py
• Added English and Italian translations for field descriptions
• Updated frontend component to display descriptions for each social field

Fixes #4514

Generated with Claude Code

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Project	Deployment	Review	Updated (UTC)
pycon	Ready	Preview	Jan 5, 2026 2:25am

[marcoacierno]

@claude revert the changes to the Python files. Only update the frontend.

[claude]

Claude finished @marcoacierno's task in 1m 36s —— View job

---

Reverted Python Changes ✅

I've successfully reverted the backend changes while keeping the frontend updates.

Completed Tasks

• Read modified files to understand changes
• Revert backend/participants/models.py to origin/main
• Verify frontend changes remain intact
• Commit and push changes

Summary

• Reverted: All changes to backend/participants/models.py (removed help_text additions to model fields)
• Kept: Frontend changes in frontend/src/components/public-profile-card/index.tsx and frontend/src/locale/index.ts with help text descriptions for all social media fields

The PR now contains only frontend changes that add help text descriptions to the social media input fields in the public profile UI.

--- | Branch: claude/issue-4514-20260105-0146