Add @vitest/coverage-v8 dependency

[GeiserX]

Summary

• Adds @vitest/coverage-v8 as a devDependency (^3.2.4) to fix CI coverage step failure
• The test:coverage script requires this package but it was missing from devDependencies

Test plan

• vitest run --coverage passes locally with the new dependency

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 8e8c0419-f3e7-4a03-8065-5f024657bb9e

📥 Commits

Reviewing files that changed from the base of the PR and between 1676816 and 0b85695.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json, !**/package-lock.json

📒 Files selected for processing (1)

• package.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/add-coverage-v8-dep

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