security: upgrade dompurify to 3.4.0 for XSS protection

[wtfiwtz]

Summary

Upgrade dompurify from 2.x to 3.4.0 to address XSS bypass vulnerabilities and improve DOM clobbering attack protection.

Changes

• package.json: Update dompurify ^2.0.17 → ^3.4.0
• viz-lib/package.json: Update dompurify ^2.0.7 → ^3.4.0, remove @types/dompurify
• viz-lib/src/services/sanitize.ts: Add explicit type annotation for DOMPurify 3.x sanitize() return type
• Regenerate pnpm-lock.yaml

CVEs Addressed

This PR addresses multiple XSS vulnerabilities:

• XSS bypass fixes in DOMPurify 3.x series
• DOM clobbering attack protection improvements
• Attribute-based XSS vectors enhanced protection
• Edge cases in HTML parsing better handling

DOMPurify 3.x includes significant security improvements over 2.x, particularly around handling of complex HTML structures and edge cases that could lead to XSS vulnerabilities in previous versions.

Code Changes

The main code change is in sanitize.ts where we add an explicit type annotation for the sanitize() function. DOMPurify 3.x returns TrustedHTML | string, which can break TypeScript declaration emit. The type annotation ensures portability:

const sanitize = DOMPurify.sanitize as (
  dirty: string | Node,
  cfg?: DOMPurify.Config
) => string;

This change maintains backward compatibility while leveraging DOMPurify 3.x security improvements.

Test Results

• ✅ Frontend tests: All 15 test suites passed (90 tests)
• ✅ TypeScript compilation: Type checking passed successfully

Related PRs

Part of the frontend security upgrade series split from #7720:

• build: upgrade pre-commit to 4.3.0 and add dev dependencies #7733: axios 1.16.0
• security: pin transitive dependencies (pyasn1, mako) #7734 (this PR): dompurify 3.4.0
• Subsequent PRs will address marked, lodash, and other dependencies

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