chore: add prettier and eslint config, format codebase

Shiva Guptarequested to merge
chore/prettier-eslint-config into main

Summary

adds shared Prettier and ESLint configuration and applies formatting across the codebase, so all contributions stay consistently formatted and linted

What's included

  • .prettierrc using prettier-plugin-tailwindcss (auto-sorts Tailwind class names)
  • eslint.config.js for expo lint
  • Repo-wide format pass (whitespace/quotes/class order only, no logic changes)

Notes

this is formatting + tooling only; no runtime behavior changes

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