maximunited / yomu / 26057772742

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fix(eslint): resolve circular dependency error by downgrading to ESLint 9

ESLint 10 caused circular dependency errors when using FlatCompat with
eslint-config-next. The error occurred because eslint-plugin-react and
other plugins don't yet support ESLint 10.

1. Downgraded ESLint from 10.3.0 to 9.39.4 (latest ESLint 9)
2. Rewrote eslint.config.mjs to use native flat config format
3. Installed required plugins explicitly:
   - typescript-eslint for TypeScript support
   - eslint-plugin-react and eslint-plugin-react-hooks
   - @next/eslint-plugin-next for Next.js rules
   - globals for environment globals

- Removed FlatCompat circular dependency workaround
- Added Jest globals for test files
- Configured ignores for build/config files
- Set rules to 'warn' instead of 'error' for gradual adoption

ESLint now runs successfully:
- \`npx eslint . --ext .js,.jsx,.ts,.tsx\` completes without crashes
- Found 324 legitimate linting issues (49 errors, 275 warnings)
- Can now use in pre-push hooks and CI

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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