chore(deps): bump immutable to clear Snyk SLA breach

[chetan-contentstack]

Summary

• immutable@5.1.5 (transitive dependency via sass) has two high-severity CVEs flagged by Snyk with an exceeded 30-day SLA:
  • SNYK-JS-IMMUTABLE-17900558 (CVE-2026-59880, Inefficient Algorithmic Complexity, CVSS 8.7)
  • SNYK-JS-IMMUTABLE-17900573 (CVE-2026-59879, Integer Overflow or Wraparound, CVSS 8.7)
• Both have fixes available since immutable@5.1.6. Bumped the existing ui/package.json override floor from >=5.1.5 to >=5.1.9 (latest), which resolves sass's transitive dependency to the patched version.

Test plan

• npm ls immutable in ui/ confirms resolution to 5.1.9
• npx sass compiles cleanly with the bumped version
• npx vitest run in ui/ — 346/346 passing (run under Node 22; the shell's default Node 21 doesn't satisfy vitest's engine requirement, unrelated to this change — verified the same failure exists without this change too)

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	14	378	25	✅ Passed
🟡 Medium Severity	19	11	500	✅ Passed
🔵 Low Severity	2	0	1000	✅ Passed

⏱️ SLA Breach Summary

⚠️ Warning: The following vulnerabilities have exceeded their SLA thresholds (days since publication).

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	371	30 / 120 days	⚠️ Warning
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

ℹ️ Vulnerabilities Without Available Fixes (Informational Only)

The following vulnerabilities were detected but do not have fixes available (no upgrade or patch). These are excluded from failure thresholds:

• Critical without fixes: 0
• High without fixes: 378
• Medium without fixes: 11
• Low without fixes: 0

⚠️ BUILD PASSED WITH WARNINGS - SLA breaches detected for issues without available fixes

Consider reviewing these vulnerabilities when fixes become available.

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	14	378	25	✅ Passed
🟡 Medium Severity	19	11	500	✅ Passed
🔵 Low Severity	2	0	1000	✅ Passed

⏱️ SLA Breach Summary

⚠️ Warning: The following vulnerabilities have exceeded their SLA thresholds (days since publication).

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	371	30 / 120 days	⚠️ Warning
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

ℹ️ Vulnerabilities Without Available Fixes (Informational Only)

The following vulnerabilities were detected but do not have fixes available (no upgrade or patch). These are excluded from failure thresholds:

• Critical without fixes: 0
• High without fixes: 378
• Medium without fixes: 11
• Low without fixes: 0

⚠️ BUILD PASSED WITH WARNINGS - SLA breaches detected for issues without available fixes

Consider reviewing these vulnerabilities when fixes become available.