fix(security): Update npm packages to fix HIGH severity vulnerabilities

Fixed 3 vulnerabilities (2 HIGH, 1 MODERATE) in frontend dependencies:

Security Vulnerabilities Fixed:
1. playwright@1.55.0 → 1.56.1 (HIGH)
   - CVE: GHSA-7mvr-c777-76hp
   - Issue: Downloads browsers without SSL certificate verification
   - Risk: Man-in-the-Middle attack during browser download
   - CWE-347: Improper Verification of Cryptographic Signature

2. @playwright/test@1.55.0 → 1.56.1 (HIGH)
   - Transitive dependency vulnerability (from playwright)
   - Same SSL certificate verification issue

3. vite@7.1.5 → 7.1.6 (MODERATE)
   - Updated to latest patched version

Impact Assessment:
- Risk Level: MEDIUM (dev dependencies only, not in production runtime)
- Attack Surface: CI/CD and developer machines during npm install
- Priority: P1 (defense-in-depth security)

Verification:
- npm audit: 0 vulnerabilities found ✅
- All packages updated to secure versions ✅

Command Used:
npm audit fix

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Co-Authored-By: Claude <noreply@anthropic.com>

Author: remyluslosius