chore: Remediate 3 Dependabot security alerts (react-router-dom 6→7)

[ernst-dev]

Summary

Upgrades react-router-dom from ^6.30.4 to ^7.18.2 (dev dependency) to resolve all 3 open Dependabot security alerts.

NPMPM availability

Not applicable — all upgraded packages are dev-only (dev: true). No non-dev dependency versions increased.

Alerts resolved

Package	Major line	Vulnerable range	Resolved version	Severity	Advisory
react-router	6.x	>= 6.0.0, < 7.18.0	7.18.2	medium	GHSA-wrjc-x8rr-h8h6 / CVE-2026-53669
react-router	6.x	>= 6.4.0, < 7.18.0	7.18.2	medium	GHSA-337j-9hxr-rhxg / CVE-2026-53666
react-router-dom	6.x	>= 6.30.2, <= 6.30.4	7.18.2	medium	GHSA-jjmj-jmhj-qwj2 / CVE-2026-53668

Remediation details

• Rung used: 2 (npm audit fix --force)
• Override added: No
• Classification:
  • ALERT-DRIVEN: react-router 6.30.4 → 7.18.2, react-router-dom 6.30.4 → 7.18.2
  • COLLATERAL: js-yaml 4.3.0 → 4.3.1 (also security-relevant), cookie@1.1.1 added, set-cookie-parser@2.7.2 added, @remix-run/router@1.23.3 removed, yaml@2.9.0 removed

Unresolved alerts

None — merging this PR is expected to CLEAR ALL 3 open Dependabot alerts for this repo.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.79%. Comparing base (d200138) to head (403da10).

❌ Your project check has failed because the head coverage (87.79%) is below the target coverage (90.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #163   +/-   ##
=======================================
  Coverage   87.79%   87.79%           
=======================================
  Files          25       25           
  Lines         344      344           
  Branches       95       95           
=======================================
  Hits          302      302           
  Misses         42       42           

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