feat: configure husky and lint-staged for pre-commit checks (#2558)

[aaniya22]

Summary

Configured Husky and lint-staged to automatically run ESLint and Prettier on staged files before each commit, catching lint/format issues before they land in the repo.

Closes #2558

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Type of Change

• ✨ New feature (non-breaking change that adds functionality)

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What Changed

• Installed husky, lint-staged, and prettier as dev dependencies
• Added prepare: "husky" script and lint-staged config to package.json
• Added .husky/pre-commit hook running pnpm exec lint-staged
• lint-staged runs eslint --fix + prettier --write on staged .js/.jsx/.ts/.tsx files, and prettier --write on staged .json/.css/.md files

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How to Test

1. Stage a .ts/.tsx file with a lint or formatting issue (e.g. inconsistent quotes, unused import)
2. Run git commit -m "test"
3. Confirm the pre-commit hook runs and auto-fixes the issue before the commit completes

Expected result: ESLint and Prettier run automatically on staged files, fixes are applied and re-staged, and the commit succeeds with clean code.

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Screenshots / Recordings

N/A — tooling 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 locally by committing a test file — hook triggered correctly, eslint --fix and prettier --write ran on the staged file, and changes were re-staged automatically before the commit finished.

[github-actions]

GSSoC Label Checklist 🏷️

@Priyanshu-byte-coder — please apply the appropriate labels before merging:

Difficulty (pick one):

• level:beginner — 20 pts
• level:intermediate — 35 pts
• level:advanced — 55 pts
• level:critical — 80 pts

Quality (optional):

• quality:clean — ×1.2 multiplier
• quality:exceptional — ×1.5 multiplier

Validation (required to score):

• gssoc:approved — counts for points
• gssoc:invalid / gssoc:spam / gssoc:ai-slop — does not score

Type labels (type:*) are auto-detected from files and title. Review and adjust if needed.
Points formula: (difficulty × quality_multiplier) + type_bonus