fix: enforce react-hooks/exhaustive-deps as an error (#2562)

[aaniya22]

Summary

Changed react-hooks/exhaustive-deps from a warning to an error in eslint.config.mjs so missing hook dependencies fail CI/lint instead of silently passing, preventing stale-closure bugs from shipping to production.

Closes #2562

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Type of Change

• 🔒 Security fix
• ♻️ Refactor / code cleanup (no functional change)

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What Changed

• Added explicit "react-hooks/exhaustive-deps": "error" rule override in eslint.config.mjs

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How to Test

1. Run npx eslint src — should pass cleanly on current codebase (no existing violations)
2. Temporarily add a useEffect with a missing dependency anywhere in src/ and re-run lint
3. Confirm it now fails the build/lint step instead of just warning

Expected result: Missing hook dependencies are reported as lint errors, not warnings.

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Screenshots / Recordings

N/A — lint config change, no UI impact.

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Checklist

• Linked the related issue above
• Self-reviewed my own diff
• No unnecessary console.log, debug code, or commented-out blocks
• npm run lint passes locally
• No TypeScript errors (npm run type-check)
• Added or updated tests where applicable
• Updated documentation / comments if behavior changed

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Accessibility (UI changes only)

N/A — no UI/markup change.

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Additional Context

Verified no existing violations in src/ before merging this in, so this shouldn't break current CI — only future PRs with genuinely missing hook dependencies.

[github-actions]

GSSoC Label Checklist 🏷️

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[github-actions]

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