fix: add rel="noopener noreferrer" to footer external links (#3751)

[ryanbasic1]

Fixes #3751

Summary

Added rel="noopener noreferrer" to footer links using target="_blank".

Why

Prevents tab-napping attacks and aligns with the security fix in #3669.

Testing

• Verified links open in a new tab
• Confirmed rel attribute is applied

[coderabbitai]

Summary by CodeRabbit

• Bug Fixes
  • Improved security for external footer links that open in new tabs by preventing the originating page from being accessible via the opened page (adds noopener/noreferrer behavior), reducing potential risk when visiting third-party sites.

Walkthrough

Added the rel="noopener noreferrer" attribute to Link elements in the Footer component that open in a new tab (target="_blank"); no other logic or exported signatures changed.

Changes

Cohort / File(s)	Summary
Security hardening frontend/src/components/Footer.tsx	Added rel="noopener noreferrer" to Link elements with target="_blank" to mitigate tab-napping and referrer exposure.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested reviewers

• kasya

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main change: adding rel="noopener noreferrer" to footer external links, with specific issue reference.
Description check	✅ Passed	The description clearly relates to the changeset, explaining the security fix and referencing the linked issue #3751 with appropriate context.
Linked Issues check	✅ Passed	The PR fully addresses the requirements in #3751 by adding rel="noopener noreferrer" to Footer Link elements with target="_blank".
Out of Scope Changes check	✅ Passed	All changes are directly related to the linked issue #3751; only the Footer.tsx file was modified to add the required security attribute.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[github-actions]

The linked issue must be assigned to the PR author.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.26%. Comparing base (4f4b13c) to head (131398e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3787   +/-   ##
=======================================
  Coverage   90.26%   90.26%           
=======================================
  Files         463      463           
  Lines       14418    14418           
  Branches     1934     1934           
=======================================
  Hits        13014    13014           
  Misses        987      987           
  Partials      417      417           

Flag	Coverage Δ
backend	90.97% <ø> (ø)
frontend	88.26% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
frontend/src/components/Footer.tsx	91.66% <ø> (ø)

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