chore: sync frontend dependency manifest

[Saahi30]

📝 Description

Aligns the frontend dependency manifest with actual imports discovered via depcheck so fresh installs and CI runs have the packages the app expects (markdown renderer, eslint helpers, etc.).

🔧 Changes Made

• Added react-markdown to runtime dependencies for proposal rendering.
• Added @eslint/compat and eslint-config-prettier to devDependencies to match the eslint config.
• Regenerated package-lock.json by running npm install.

✅ Checklist

• I have read the contributing guidelines.
• I have added tests that prove my fix is effective or that my feature works.
• I have added necessary documentation (if applicable).
• Any dependent changes have been merged and published in downstream modules.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/frontend-deps-audit

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