fix: patch known vulnerabilities in transitive dependencies

[himerus]

Summary

• Bumps flatted override from >=3.4.0 to >=3.4.2 — fixes prototype pollution via parse() (CVE in flatted ≤3.4.1)
• Adds picomatch@<3: >=2.3.2 override — fixes ReDoS via extglob quantifiers in micromatch dependency chain
• Adds picomatch@>=4: >=4.0.4 override — fixes ReDoS in tinyglobby → picomatch@4.x chain

Test plan

• CI pnpm audit --audit-level=high returns 0 vulnerabilities
• All existing tests pass
• Build succeeds

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: cc886ccc-eb16-45c1-8c6e-44808aa6ee0f

📥 Commits

Reviewing files that changed from the base of the PR and between 3214e7c and f64ca85.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (1)

• package.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/sec-patch-vulnerable-transitive-deps

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